From ae824e838aeb679dba3a538868f75980d4a0d645 Mon Sep 17 00:00:00 2001
From: Thomas Munro <thomas.munro@gmail.com>
Date: Mon, 9 Feb 2026 20:25:18 +1300
Subject: [PATCH v1] Remove MULE_INTERNAL encoding.

This was useful before widespread Unicode adoption, and was based on the
internal encoding Emacs used to mix multiple sub-encodings.  Emacs
itself has stopped using it, and our implementation hadn't been updated
with modern underlying standards.  It is thought to be very unlikely
that anyone is still using it in the field.  Since such a complex
encoding comes with costs and risks, we agreed to drop support.

Any existing database using this encoding would need to be dumped and
restored with a new encoding to upgrade to PostgreSQL 19, most likely
UTF8, since pg_upgrade would fail.

Reviewed-by: Tom Lane <tgl@sss.pgh.pa.us>
Reviewed-by: Tatsuo Ishii <ishii@postgresql.org>
Discussion: https://postgr.es/m/CA%2BhUKGKXDXh-FdU0orjfv%2BF08f%3DD91BhV3Ra-4zL-q%2BJmGYqTA%40mail.gmail.com
---
 doc/src/sgml/charset.sgml                     | 191 +-------
 src/backend/utils/mb/conv.c                   | 238 ----------
 .../utils/mb/conversion_procs/Makefile        |   4 +-
 .../{latin_and_mic => cyrillic}/Makefile      |   8 +-
 .../cyrillic.c}                               | 144 +-----
 .../cyrillic_and_mic/Makefile                 |  13 -
 .../conversion_procs/euc_cn_and_mic/Makefile  |  13 -
 .../euc_cn_and_mic/euc_cn_and_mic.c           | 169 -------
 .../euc_jp_and_sjis/euc_jp_and_sjis.c         | 448 +-----------------
 .../conversion_procs/euc_kr_and_mic/Makefile  |  13 -
 .../euc_kr_and_mic/euc_kr_and_mic.c           | 177 -------
 .../conversion_procs/euc_tw_and_big5/big5.c   |   3 +-
 .../euc_tw_and_big5/euc_tw_and_big5.c         | 356 +-------------
 .../latin2_and_win1250/latin2_and_win1250.c   |  70 ---
 .../latin_and_mic/latin_and_mic.c             | 139 ------
 .../utils/mb/conversion_procs/meson.build     |   5 +-
 src/backend/utils/mb/mbutils.c                |   6 +-
 src/common/encnames.c                         |   8 -
 src/common/wchar.c                            | 223 ---------
 src/include/catalog/pg_conversion.dat         |  90 ----
 src/include/catalog/pg_proc.dat               | 174 +------
 src/include/mb/pg_wchar.h                     | 198 +-------
 src/pl/plpython/plpy_util.c                   |   4 +-
 src/test/mb/expected/mule_internal.out        | 333 -------------
 src/test/mb/mbregress.sh                      |   2 +-
 src/test/mb/sql/mule_internal.sql             |  72 ---
 src/test/modules/test_escape/test_escape.c    |   2 -
 src/test/regress/expected/conversion.out      | 127 -----
 src/test/regress/expected/encoding.out        |  17 +-
 src/test/regress/expected/object_address.out  |   4 +-
 src/test/regress/expected/xml.out             |   4 +-
 src/test/regress/expected/xml_1.out           |   4 +-
 src/test/regress/expected/xml_2.out           |   4 +-
 src/test/regress/regress.c                    |   2 +
 src/test/regress/sql/conversion.sql           |  27 --
 src/test/regress/sql/encoding.sql             |  11 +-
 src/test/regress/sql/object_address.sql       |   2 +-
 src/test/regress/sql/xml.sql                  |   4 +-
 38 files changed, 55 insertions(+), 3254 deletions(-)
 rename src/backend/utils/mb/conversion_procs/{latin_and_mic => cyrillic}/Makefile (57%)
 rename src/backend/utils/mb/conversion_procs/{cyrillic_and_mic/cyrillic_and_mic.c => cyrillic/cyrillic.c} (80%)
 delete mode 100644 src/backend/utils/mb/conversion_procs/cyrillic_and_mic/Makefile
 delete mode 100644 src/backend/utils/mb/conversion_procs/euc_cn_and_mic/Makefile
 delete mode 100644 src/backend/utils/mb/conversion_procs/euc_cn_and_mic/euc_cn_and_mic.c
 delete mode 100644 src/backend/utils/mb/conversion_procs/euc_kr_and_mic/Makefile
 delete mode 100644 src/backend/utils/mb/conversion_procs/euc_kr_and_mic/euc_kr_and_mic.c
 delete mode 100644 src/backend/utils/mb/conversion_procs/latin_and_mic/latin_and_mic.c
 delete mode 100644 src/test/mb/expected/mule_internal.out
 delete mode 100644 src/test/mb/sql/mule_internal.sql

diff --git a/doc/src/sgml/charset.sgml b/doc/src/sgml/charset.sgml
index 3aabc798012..2895fd43f86 100644
--- a/doc/src/sgml/charset.sgml
+++ b/doc/src/sgml/charset.sgml
@@ -2045,15 +2045,6 @@ ORDER BY c COLLATE ebcdic;
          <entry>1</entry>
          <entry><literal>ISO885916</literal></entry>
         </row>
-        <row>
-         <entry><literal>MULE_INTERNAL</literal></entry>
-         <entry>Mule internal code</entry>
-         <entry>Multilingual Emacs</entry>
-         <entry>Yes</entry>
-         <entry>No</entry>
-         <entry>1&ndash;4</entry>
-         <entry></entry>
-        </row>
         <row>
          <entry><literal>SJIS</literal></entry>
          <entry>Shift JIS</entry>
@@ -2205,7 +2196,7 @@ ORDER BY c COLLATE ebcdic;
      <para>
       Not all client <acronym>API</acronym>s support all the listed character sets. For example, the
       <productname>PostgreSQL</productname>
-      JDBC driver does not support <literal>MULE_INTERNAL</literal>, <literal>LATIN6</literal>,
+      JDBC driver does not support <literal>LATIN6</literal>,
       <literal>LATIN8</literal>, and <literal>LATIN10</literal>.
      </para>
 
@@ -2463,14 +2454,12 @@ RESET client_encoding;
        <row>
         <entry><literal>EUC_CN</literal></entry>
         <entry><emphasis>EUC_CN</emphasis>,
-        <literal>MULE_INTERNAL</literal>,
         <literal>UTF8</literal>
         </entry>
        </row>
        <row>
         <entry><literal>EUC_JP</literal></entry>
         <entry><emphasis>EUC_JP</emphasis>,
-        <literal>MULE_INTERNAL</literal>,
         <literal>SJIS</literal>,
         <literal>UTF8</literal>
         </entry>
@@ -2485,7 +2474,6 @@ RESET client_encoding;
        <row>
         <entry><literal>EUC_KR</literal></entry>
         <entry><emphasis>EUC_KR</emphasis>,
-        <literal>MULE_INTERNAL</literal>,
         <literal>UTF8</literal>
         </entry>
        </row>
@@ -2493,7 +2481,6 @@ RESET client_encoding;
         <entry><literal>EUC_TW</literal></entry>
         <entry><emphasis>EUC_TW</emphasis>,
         <literal>BIG5</literal>,
-        <literal>MULE_INTERNAL</literal>,
         <literal>UTF8</literal>
         </entry>
        </row>
@@ -2511,7 +2498,6 @@ RESET client_encoding;
         <entry><literal>ISO_8859_5</literal></entry>
         <entry><emphasis>ISO_8859_5</emphasis>,
         <literal>KOI8R</literal>,
-        <literal>MULE_INTERNAL</literal>,
         <literal>UTF8</literal>,
         <literal>WIN866</literal>,
         <literal>WIN1251</literal>
@@ -2544,7 +2530,6 @@ RESET client_encoding;
         <entry><literal>KOI8R</literal></entry>
         <entry><emphasis>KOI8R</emphasis>,
         <literal>ISO_8859_5</literal>,
-        <literal>MULE_INTERNAL</literal>,
         <literal>UTF8</literal>,
         <literal>WIN866</literal>,
         <literal>WIN1251</literal>
@@ -2559,14 +2544,12 @@ RESET client_encoding;
        <row>
         <entry><literal>LATIN1</literal></entry>
         <entry><emphasis>LATIN1</emphasis>,
-        <literal>MULE_INTERNAL</literal>,
         <literal>UTF8</literal>
         </entry>
        </row>
        <row>
         <entry><literal>LATIN2</literal></entry>
         <entry><emphasis>LATIN2</emphasis>,
-        <literal>MULE_INTERNAL</literal>,
         <literal>UTF8</literal>,
         <literal>WIN1250</literal>
         </entry>
@@ -2574,14 +2557,12 @@ RESET client_encoding;
        <row>
         <entry><literal>LATIN3</literal></entry>
         <entry><emphasis>LATIN3</emphasis>,
-        <literal>MULE_INTERNAL</literal>,
         <literal>UTF8</literal>
         </entry>
        </row>
        <row>
         <entry><literal>LATIN4</literal></entry>
         <entry><emphasis>LATIN4</emphasis>,
-        <literal>MULE_INTERNAL</literal>,
         <literal>UTF8</literal>
         </entry>
        </row>
@@ -2621,23 +2602,6 @@ RESET client_encoding;
         <literal>UTF8</literal>
         </entry>
        </row>
-       <row>
-        <entry><literal>MULE_INTERNAL</literal></entry>
-        <entry><emphasis>MULE_INTERNAL</emphasis>,
-         <literal>BIG5</literal>,
-         <literal>EUC_CN</literal>,
-         <literal>EUC_JP</literal>,
-         <literal>EUC_KR</literal>,
-         <literal>EUC_TW</literal>,
-         <literal>ISO_8859_5</literal>,
-         <literal>KOI8R</literal>,
-         <literal>LATIN1</literal> to <literal>LATIN4</literal>,
-         <literal>SJIS</literal>,
-         <literal>WIN866</literal>,
-         <literal>WIN1250</literal>,
-         <literal>WIN1251</literal>
-        </entry>
-       </row>
        <row>
         <entry><literal>SJIS</literal></entry>
         <entry><emphasis>not supported as a server encoding</emphasis>
@@ -2668,7 +2632,6 @@ RESET client_encoding;
         <entry><emphasis>WIN866</emphasis>,
          <literal>ISO_8859_5</literal>,
          <literal>KOI8R</literal>,
-         <literal>MULE_INTERNAL</literal>,
          <literal>UTF8</literal>,
          <literal>WIN1251</literal>
         </entry>
@@ -2683,7 +2646,6 @@ RESET client_encoding;
         <entry><literal>WIN1250</literal></entry>
         <entry><emphasis>WIN1250</emphasis>,
          <literal>LATIN2</literal>,
-         <literal>MULE_INTERNAL</literal>,
          <literal>UTF8</literal>
         </entry>
        </row>
@@ -2692,7 +2654,6 @@ RESET client_encoding;
         <entry><emphasis>WIN1251</emphasis>,
          <literal>ISO_8859_5</literal>,
          <literal>KOI8R</literal>,
-         <literal>MULE_INTERNAL</literal>,
          <literal>UTF8</literal>,
          <literal>WIN866</literal>
         </entry>
@@ -2775,31 +2736,16 @@ RESET client_encoding;
         <entry><literal>BIG5</literal></entry>
         <entry><literal>EUC_TW</literal></entry>
        </row>
-       <row>
-        <entry><literal>big5_to_mic</literal></entry>
-        <entry><literal>BIG5</literal></entry>
-        <entry><literal>MULE_INTERNAL</literal></entry>
-       </row>
        <row>
         <entry><literal>big5_to_utf8</literal></entry>
         <entry><literal>BIG5</literal></entry>
         <entry><literal>UTF8</literal></entry>
        </row>
-       <row>
-        <entry><literal>euc_cn_to_mic</literal></entry>
-        <entry><literal>EUC_CN</literal></entry>
-        <entry><literal>MULE_INTERNAL</literal></entry>
-       </row>
        <row>
         <entry><literal>euc_cn_to_utf8</literal></entry>
         <entry><literal>EUC_CN</literal></entry>
         <entry><literal>UTF8</literal></entry>
        </row>
-       <row>
-        <entry><literal>euc_jp_to_mic</literal></entry>
-        <entry><literal>EUC_JP</literal></entry>
-        <entry><literal>MULE_INTERNAL</literal></entry>
-       </row>
        <row>
         <entry><literal>euc_jp_to_sjis</literal></entry>
         <entry><literal>EUC_JP</literal></entry>
@@ -2810,11 +2756,6 @@ RESET client_encoding;
         <entry><literal>EUC_JP</literal></entry>
         <entry><literal>UTF8</literal></entry>
        </row>
-       <row>
-        <entry><literal>euc_kr_to_mic</literal></entry>
-        <entry><literal>EUC_KR</literal></entry>
-        <entry><literal>MULE_INTERNAL</literal></entry>
-       </row>
        <row>
         <entry><literal>euc_kr_to_utf8</literal></entry>
         <entry><literal>EUC_KR</literal></entry>
@@ -2825,11 +2766,6 @@ RESET client_encoding;
         <entry><literal>EUC_TW</literal></entry>
         <entry><literal>BIG5</literal></entry>
        </row>
-       <row>
-        <entry><literal>euc_tw_to_mic</literal></entry>
-        <entry><literal>EUC_TW</literal></entry>
-        <entry><literal>MULE_INTERNAL</literal></entry>
-       </row>
        <row>
         <entry><literal>euc_tw_to_utf8</literal></entry>
         <entry><literal>EUC_TW</literal></entry>
@@ -2870,21 +2806,11 @@ RESET client_encoding;
         <entry><literal>LATIN10</literal></entry>
         <entry><literal>UTF8</literal></entry>
        </row>
-       <row>
-        <entry><literal>iso_8859_1_to_mic</literal></entry>
-        <entry><literal>LATIN1</literal></entry>
-        <entry><literal>MULE_INTERNAL</literal></entry>
-       </row>
        <row>
         <entry><literal>iso_8859_1_to_utf8</literal></entry>
         <entry><literal>LATIN1</literal></entry>
         <entry><literal>UTF8</literal></entry>
        </row>
-       <row>
-        <entry><literal>iso_8859_2_to_mic</literal></entry>
-        <entry><literal>LATIN2</literal></entry>
-        <entry><literal>MULE_INTERNAL</literal></entry>
-       </row>
        <row>
         <entry><literal>iso_8859_2_to_utf8</literal></entry>
         <entry><literal>LATIN2</literal></entry>
@@ -2895,21 +2821,11 @@ RESET client_encoding;
         <entry><literal>LATIN2</literal></entry>
         <entry><literal>WIN1250</literal></entry>
        </row>
-       <row>
-        <entry><literal>iso_8859_3_to_mic</literal></entry>
-        <entry><literal>LATIN3</literal></entry>
-        <entry><literal>MULE_INTERNAL</literal></entry>
-       </row>
        <row>
         <entry><literal>iso_8859_3_to_utf8</literal></entry>
         <entry><literal>LATIN3</literal></entry>
         <entry><literal>UTF8</literal></entry>
        </row>
-       <row>
-        <entry><literal>iso_8859_4_to_mic</literal></entry>
-        <entry><literal>LATIN4</literal></entry>
-        <entry><literal>MULE_INTERNAL</literal></entry>
-       </row>
        <row>
         <entry><literal>iso_8859_4_to_utf8</literal></entry>
         <entry><literal>LATIN4</literal></entry>
@@ -2920,11 +2836,6 @@ RESET client_encoding;
         <entry><literal>ISO_8859_5</literal></entry>
         <entry><literal>KOI8R</literal></entry>
        </row>
-       <row>
-        <entry><literal>iso_8859_5_to_mic</literal></entry>
-        <entry><literal>ISO_8859_5</literal></entry>
-        <entry><literal>MULE_INTERNAL</literal></entry>
-       </row>
        <row>
         <entry><literal>iso_8859_5_to_utf8</literal></entry>
         <entry><literal>ISO_8859_5</literal></entry>
@@ -2970,11 +2881,6 @@ RESET client_encoding;
         <entry><literal>KOI8R</literal></entry>
         <entry><literal>ISO_8859_5</literal></entry>
        </row>
-       <row>
-        <entry><literal>koi8_r_to_mic</literal></entry>
-        <entry><literal>KOI8R</literal></entry>
-        <entry><literal>MULE_INTERNAL</literal></entry>
-       </row>
        <row>
         <entry><literal>koi8_r_to_utf8</literal></entry>
         <entry><literal>KOI8R</literal></entry>
@@ -2995,91 +2901,11 @@ RESET client_encoding;
         <entry><literal>KOI8U</literal></entry>
         <entry><literal>UTF8</literal></entry>
        </row>
-       <row>
-        <entry><literal>mic_to_big5</literal></entry>
-        <entry><literal>MULE_INTERNAL</literal></entry>
-        <entry><literal>BIG5</literal></entry>
-       </row>
-       <row>
-        <entry><literal>mic_to_euc_cn</literal></entry>
-        <entry><literal>MULE_INTERNAL</literal></entry>
-        <entry><literal>EUC_CN</literal></entry>
-       </row>
-       <row>
-        <entry><literal>mic_to_euc_jp</literal></entry>
-        <entry><literal>MULE_INTERNAL</literal></entry>
-        <entry><literal>EUC_JP</literal></entry>
-       </row>
-       <row>
-        <entry><literal>mic_to_euc_kr</literal></entry>
-        <entry><literal>MULE_INTERNAL</literal></entry>
-        <entry><literal>EUC_KR</literal></entry>
-       </row>
-       <row>
-        <entry><literal>mic_to_euc_tw</literal></entry>
-        <entry><literal>MULE_INTERNAL</literal></entry>
-        <entry><literal>EUC_TW</literal></entry>
-       </row>
-       <row>
-        <entry><literal>mic_to_iso_8859_1</literal></entry>
-        <entry><literal>MULE_INTERNAL</literal></entry>
-        <entry><literal>LATIN1</literal></entry>
-       </row>
-       <row>
-        <entry><literal>mic_to_iso_8859_2</literal></entry>
-        <entry><literal>MULE_INTERNAL</literal></entry>
-        <entry><literal>LATIN2</literal></entry>
-       </row>
-       <row>
-        <entry><literal>mic_to_iso_8859_3</literal></entry>
-        <entry><literal>MULE_INTERNAL</literal></entry>
-        <entry><literal>LATIN3</literal></entry>
-       </row>
-       <row>
-        <entry><literal>mic_to_iso_8859_4</literal></entry>
-        <entry><literal>MULE_INTERNAL</literal></entry>
-        <entry><literal>LATIN4</literal></entry>
-       </row>
-       <row>
-        <entry><literal>mic_to_iso_8859_5</literal></entry>
-        <entry><literal>MULE_INTERNAL</literal></entry>
-        <entry><literal>ISO_8859_5</literal></entry>
-       </row>
-       <row>
-        <entry><literal>mic_to_koi8_r</literal></entry>
-        <entry><literal>MULE_INTERNAL</literal></entry>
-        <entry><literal>KOI8R</literal></entry>
-       </row>
-       <row>
-        <entry><literal>mic_to_sjis</literal></entry>
-        <entry><literal>MULE_INTERNAL</literal></entry>
-        <entry><literal>SJIS</literal></entry>
-       </row>
-       <row>
-        <entry><literal>mic_to_windows_1250</literal></entry>
-        <entry><literal>MULE_INTERNAL</literal></entry>
-        <entry><literal>WIN1250</literal></entry>
-       </row>
-       <row>
-        <entry><literal>mic_to_windows_1251</literal></entry>
-        <entry><literal>MULE_INTERNAL</literal></entry>
-        <entry><literal>WIN1251</literal></entry>
-       </row>
-       <row>
-        <entry><literal>mic_to_windows_866</literal></entry>
-        <entry><literal>MULE_INTERNAL</literal></entry>
-        <entry><literal>WIN866</literal></entry>
-       </row>
        <row>
         <entry><literal>sjis_to_euc_jp</literal></entry>
         <entry><literal>SJIS</literal></entry>
         <entry><literal>EUC_JP</literal></entry>
        </row>
-       <row>
-        <entry><literal>sjis_to_mic</literal></entry>
-        <entry><literal>SJIS</literal></entry>
-        <entry><literal>MULE_INTERNAL</literal></entry>
-       </row>
        <row>
         <entry><literal>sjis_to_utf8</literal></entry>
         <entry><literal>SJIS</literal></entry>
@@ -3285,11 +3111,6 @@ RESET client_encoding;
         <entry><literal>WIN1250</literal></entry>
         <entry><literal>LATIN2</literal></entry>
        </row>
-       <row>
-        <entry><literal>windows_1250_to_mic</literal></entry>
-        <entry><literal>WIN1250</literal></entry>
-        <entry><literal>MULE_INTERNAL</literal></entry>
-       </row>
        <row>
         <entry><literal>windows_1250_to_utf8</literal></entry>
         <entry><literal>WIN1250</literal></entry>
@@ -3305,11 +3126,6 @@ RESET client_encoding;
         <entry><literal>WIN1251</literal></entry>
         <entry><literal>KOI8R</literal></entry>
        </row>
-       <row>
-        <entry><literal>windows_1251_to_mic</literal></entry>
-        <entry><literal>WIN1251</literal></entry>
-        <entry><literal>MULE_INTERNAL</literal></entry>
-       </row>
        <row>
         <entry><literal>windows_1251_to_utf8</literal></entry>
         <entry><literal>WIN1251</literal></entry>
@@ -3340,11 +3156,6 @@ RESET client_encoding;
         <entry><literal>WIN866</literal></entry>
         <entry><literal>KOI8R</literal></entry>
        </row>
-       <row>
-        <entry><literal>windows_866_to_mic</literal></entry>
-        <entry><literal>WIN866</literal></entry>
-        <entry><literal>MULE_INTERNAL</literal></entry>
-       </row>
        <row>
         <entry><literal>windows_866_to_utf8</literal></entry>
         <entry><literal>WIN866</literal></entry>
diff --git a/src/backend/utils/mb/conv.c b/src/backend/utils/mb/conv.c
index 5439d0940d1..79238bf6647 100644
--- a/src/backend/utils/mb/conv.c
+++ b/src/backend/utils/mb/conv.c
@@ -74,244 +74,6 @@ local2local(const unsigned char *l,
 	return l - start;
 }
 
-/*
- * LATINn ---> MIC when the charset's local codes map directly to MIC
- *
- * l points to the source string of length len
- * p is the output area (must be large enough!)
- * lc is the mule character set id for the local encoding
- * encoding is the PG identifier for the local encoding
- *
- * Returns the number of input bytes consumed.  If noError is true, this can
- * be less than 'len'.
- */
-int
-latin2mic(const unsigned char *l, unsigned char *p, int len,
-		  int lc, int encoding, bool noError)
-{
-	const unsigned char *start = l;
-	int			c1;
-
-	while (len > 0)
-	{
-		c1 = *l;
-		if (c1 == 0)
-		{
-			if (noError)
-				break;
-			report_invalid_encoding(encoding, (const char *) l, len);
-		}
-		if (IS_HIGHBIT_SET(c1))
-			*p++ = lc;
-		*p++ = c1;
-		l++;
-		len--;
-	}
-	*p = '\0';
-
-	return l - start;
-}
-
-/*
- * MIC ---> LATINn when the charset's local codes map directly to MIC
- *
- * mic points to the source string of length len
- * p is the output area (must be large enough!)
- * lc is the mule character set id for the local encoding
- * encoding is the PG identifier for the local encoding
- *
- * Returns the number of input bytes consumed.  If noError is true, this can
- * be less than 'len'.
- */
-int
-mic2latin(const unsigned char *mic, unsigned char *p, int len,
-		  int lc, int encoding, bool noError)
-{
-	const unsigned char *start = mic;
-	int			c1;
-
-	while (len > 0)
-	{
-		c1 = *mic;
-		if (c1 == 0)
-		{
-			if (noError)
-				break;
-			report_invalid_encoding(PG_MULE_INTERNAL, (const char *) mic, len);
-		}
-		if (!IS_HIGHBIT_SET(c1))
-		{
-			/* easy for ASCII */
-			*p++ = c1;
-			mic++;
-			len--;
-		}
-		else
-		{
-			int			l = pg_mule_mblen(mic);
-
-			if (len < l)
-			{
-				if (noError)
-					break;
-				report_invalid_encoding(PG_MULE_INTERNAL, (const char *) mic,
-										len);
-			}
-			if (l != 2 || c1 != lc || !IS_HIGHBIT_SET(mic[1]))
-			{
-				if (noError)
-					break;
-				report_untranslatable_char(PG_MULE_INTERNAL, encoding,
-										   (const char *) mic, len);
-			}
-			*p++ = mic[1];
-			mic += 2;
-			len -= 2;
-		}
-	}
-	*p = '\0';
-
-	return mic - start;
-}
-
-
-/*
- * latin2mic_with_table: a generic single byte charset encoding
- * conversion from a local charset to the mule internal code.
- *
- * l points to the source string of length len
- * p is the output area (must be large enough!)
- * lc is the mule character set id for the local encoding
- * encoding is the PG identifier for the local encoding
- * tab holds conversion entries for the local charset
- * starting from 128 (0x80). each entry in the table holds the corresponding
- * code point for the mule encoding, or 0 if there is no equivalent code.
- *
- * Returns the number of input bytes consumed.  If noError is true, this can
- * be less than 'len'.
- */
-int
-latin2mic_with_table(const unsigned char *l,
-					 unsigned char *p,
-					 int len,
-					 int lc,
-					 int encoding,
-					 const unsigned char *tab,
-					 bool noError)
-{
-	const unsigned char *start = l;
-	unsigned char c1,
-				c2;
-
-	while (len > 0)
-	{
-		c1 = *l;
-		if (c1 == 0)
-		{
-			if (noError)
-				break;
-			report_invalid_encoding(encoding, (const char *) l, len);
-		}
-		if (!IS_HIGHBIT_SET(c1))
-			*p++ = c1;
-		else
-		{
-			c2 = tab[c1 - HIGHBIT];
-			if (c2)
-			{
-				*p++ = lc;
-				*p++ = c2;
-			}
-			else
-			{
-				if (noError)
-					break;
-				report_untranslatable_char(encoding, PG_MULE_INTERNAL,
-										   (const char *) l, len);
-			}
-		}
-		l++;
-		len--;
-	}
-	*p = '\0';
-
-	return l - start;
-}
-
-/*
- * mic2latin_with_table: a generic single byte charset encoding
- * conversion from the mule internal code to a local charset.
- *
- * mic points to the source string of length len
- * p is the output area (must be large enough!)
- * lc is the mule character set id for the local encoding
- * encoding is the PG identifier for the local encoding
- * tab holds conversion entries for the mule internal code's second byte,
- * starting from 128 (0x80). each entry in the table holds the corresponding
- * code point for the local charset, or 0 if there is no equivalent code.
- *
- * Returns the number of input bytes consumed.  If noError is true, this can
- * be less than 'len'.
- */
-int
-mic2latin_with_table(const unsigned char *mic,
-					 unsigned char *p,
-					 int len,
-					 int lc,
-					 int encoding,
-					 const unsigned char *tab,
-					 bool noError)
-{
-	const unsigned char *start = mic;
-	unsigned char c1,
-				c2;
-
-	while (len > 0)
-	{
-		c1 = *mic;
-		if (c1 == 0)
-		{
-			if (noError)
-				break;
-			report_invalid_encoding(PG_MULE_INTERNAL, (const char *) mic, len);
-		}
-		if (!IS_HIGHBIT_SET(c1))
-		{
-			/* easy for ASCII */
-			*p++ = c1;
-			mic++;
-			len--;
-		}
-		else
-		{
-			int			l = pg_mule_mblen(mic);
-
-			if (len < l)
-			{
-				if (noError)
-					break;
-				report_invalid_encoding(PG_MULE_INTERNAL, (const char *) mic,
-										len);
-			}
-			if (l != 2 || c1 != lc || !IS_HIGHBIT_SET(mic[1]) ||
-				(c2 = tab[mic[1] - HIGHBIT]) == 0)
-			{
-				if (noError)
-					break;
-				report_untranslatable_char(PG_MULE_INTERNAL, encoding,
-										   (const char *) mic, len);
-				break;			/* keep compiler quiet */
-			}
-			*p++ = c2;
-			mic += 2;
-			len -= 2;
-		}
-	}
-	*p = '\0';
-
-	return mic - start;
-}
-
 /*
  * comparison routine for bsearch()
  * this routine is intended for combined UTF8 -> local code
diff --git a/src/backend/utils/mb/conversion_procs/Makefile b/src/backend/utils/mb/conversion_procs/Makefile
index bcadf6688d6..d3c49275a15 100644
--- a/src/backend/utils/mb/conversion_procs/Makefile
+++ b/src/backend/utils/mb/conversion_procs/Makefile
@@ -14,8 +14,8 @@ top_builddir = ../../../../..
 include $(top_builddir)/src/Makefile.global
 
 SUBDIRS = \
-	cyrillic_and_mic euc_cn_and_mic euc_jp_and_sjis \
-	euc_kr_and_mic euc_tw_and_big5 latin2_and_win1250 latin_and_mic \
+	cyrillic euc_jp_and_sjis \
+	euc_tw_and_big5 latin2_and_win1250 \
 	utf8_and_big5 utf8_and_cyrillic utf8_and_euc_cn \
 	utf8_and_euc_jp utf8_and_euc_kr utf8_and_euc_tw utf8_and_gb18030 \
 	utf8_and_gbk utf8_and_iso8859 utf8_and_iso8859_1 utf8_and_johab \
diff --git a/src/backend/utils/mb/conversion_procs/latin_and_mic/Makefile b/src/backend/utils/mb/conversion_procs/cyrillic/Makefile
similarity index 57%
rename from src/backend/utils/mb/conversion_procs/latin_and_mic/Makefile
rename to src/backend/utils/mb/conversion_procs/cyrillic/Makefile
index c404738d2f6..1ad04c20300 100644
--- a/src/backend/utils/mb/conversion_procs/latin_and_mic/Makefile
+++ b/src/backend/utils/mb/conversion_procs/cyrillic/Makefile
@@ -1,13 +1,13 @@
 #-------------------------------------------------------------------------
 #
-# src/backend/utils/mb/conversion_procs/latin_and_mic/Makefile
+# src/backend/utils/mb/conversion_procs/cyrillic/Makefile
 #
 #-------------------------------------------------------------------------
-subdir = src/backend/utils/mb/conversion_procs/latin_and_mic
+subdir = src/backend/utils/mb/conversion_procs/cyrillic
 top_builddir = ../../../../../..
 include $(top_builddir)/src/Makefile.global
 
-NAME		= latin_and_mic
-PGFILEDESC	= "latin <-> mic text conversions"
+NAME		= cyrillic
+PGFILEDESC	= "cyrillic single-byte conversions"
 
 include $(srcdir)/../proc.mk
diff --git a/src/backend/utils/mb/conversion_procs/cyrillic_and_mic/cyrillic_and_mic.c b/src/backend/utils/mb/conversion_procs/cyrillic/cyrillic.c
similarity index 80%
rename from src/backend/utils/mb/conversion_procs/cyrillic_and_mic/cyrillic_and_mic.c
rename to src/backend/utils/mb/conversion_procs/cyrillic/cyrillic.c
index 8d3c0e94323..16f91c80a75 100644
--- a/src/backend/utils/mb/conversion_procs/cyrillic_and_mic/cyrillic_and_mic.c
+++ b/src/backend/utils/mb/conversion_procs/cyrillic/cyrillic.c
@@ -1,12 +1,12 @@
 /*-------------------------------------------------------------------------
  *
- *	  Cyrillic and MULE_INTERNAL
+ *	  KOI8R, WIN1251, WIN866 and ISO_8859_5
  *
  * Portions Copyright (c) 1996-2026, PostgreSQL Global Development Group
  * Portions Copyright (c) 1994, Regents of the University of California
  *
  * IDENTIFICATION
- *	  src/backend/utils/mb/conversion_procs/cyrillic_and_mic/cyrillic_and_mic.c
+ *	  src/backend/utils/mb/conversion_procs/cyrillic/cyrillic.c
  *
  *-------------------------------------------------------------------------
  */
@@ -16,18 +16,10 @@
 #include "mb/pg_wchar.h"
 
 PG_MODULE_MAGIC_EXT(
-					.name = "cyrillic_and_mic",
+					.name = "cyrillic",
 					.version = PG_VERSION
 );
 
-PG_FUNCTION_INFO_V1(koi8r_to_mic);
-PG_FUNCTION_INFO_V1(mic_to_koi8r);
-PG_FUNCTION_INFO_V1(iso_to_mic);
-PG_FUNCTION_INFO_V1(mic_to_iso);
-PG_FUNCTION_INFO_V1(win1251_to_mic);
-PG_FUNCTION_INFO_V1(mic_to_win1251);
-PG_FUNCTION_INFO_V1(win866_to_mic);
-PG_FUNCTION_INFO_V1(mic_to_win866);
 PG_FUNCTION_INFO_V1(koi8r_to_win1251);
 PG_FUNCTION_INFO_V1(win1251_to_koi8r);
 PG_FUNCTION_INFO_V1(koi8r_to_win866);
@@ -59,7 +51,7 @@ PG_FUNCTION_INFO_V1(win866_to_iso);
  * Cyrillic support
  * currently supported Cyrillic encodings:
  *
- * KOI8-R (this is also the charset for the mule internal code for Cyrillic)
+ * KOI8-R
  * ISO-8859-5
  * Microsoft's CP1251 (windows-1251)
  * Alternativny Variant (MS-DOS CP866)
@@ -306,134 +298,6 @@ static const unsigned char win8662iso[] = {
 };
 
 
-Datum
-koi8r_to_mic(PG_FUNCTION_ARGS)
-{
-	unsigned char *src = (unsigned char *) PG_GETARG_CSTRING(2);
-	unsigned char *dest = (unsigned char *) PG_GETARG_CSTRING(3);
-	int			len = PG_GETARG_INT32(4);
-	bool		noError = PG_GETARG_BOOL(5);
-	int			converted;
-
-	CHECK_ENCODING_CONVERSION_ARGS(PG_KOI8R, PG_MULE_INTERNAL);
-
-	converted = latin2mic(src, dest, len, LC_KOI8_R, PG_KOI8R, noError);
-
-	PG_RETURN_INT32(converted);
-}
-
-Datum
-mic_to_koi8r(PG_FUNCTION_ARGS)
-{
-	unsigned char *src = (unsigned char *) PG_GETARG_CSTRING(2);
-	unsigned char *dest = (unsigned char *) PG_GETARG_CSTRING(3);
-	int			len = PG_GETARG_INT32(4);
-	bool		noError = PG_GETARG_BOOL(5);
-	int			converted;
-
-	CHECK_ENCODING_CONVERSION_ARGS(PG_MULE_INTERNAL, PG_KOI8R);
-
-	converted = mic2latin(src, dest, len, LC_KOI8_R, PG_KOI8R, noError);
-
-	PG_RETURN_INT32(converted);
-}
-
-Datum
-iso_to_mic(PG_FUNCTION_ARGS)
-{
-	unsigned char *src = (unsigned char *) PG_GETARG_CSTRING(2);
-	unsigned char *dest = (unsigned char *) PG_GETARG_CSTRING(3);
-	int			len = PG_GETARG_INT32(4);
-	bool		noError = PG_GETARG_BOOL(5);
-	int			converted;
-
-	CHECK_ENCODING_CONVERSION_ARGS(PG_ISO_8859_5, PG_MULE_INTERNAL);
-
-	converted = latin2mic_with_table(src, dest, len, LC_KOI8_R, PG_ISO_8859_5, iso2koi, noError);
-
-	PG_RETURN_INT32(converted);
-}
-
-Datum
-mic_to_iso(PG_FUNCTION_ARGS)
-{
-	unsigned char *src = (unsigned char *) PG_GETARG_CSTRING(2);
-	unsigned char *dest = (unsigned char *) PG_GETARG_CSTRING(3);
-	int			len = PG_GETARG_INT32(4);
-	bool		noError = PG_GETARG_BOOL(5);
-	int			converted;
-
-	CHECK_ENCODING_CONVERSION_ARGS(PG_MULE_INTERNAL, PG_ISO_8859_5);
-
-	converted = mic2latin_with_table(src, dest, len, LC_KOI8_R, PG_ISO_8859_5, koi2iso, noError);
-
-	PG_RETURN_INT32(converted);
-}
-
-Datum
-win1251_to_mic(PG_FUNCTION_ARGS)
-{
-	unsigned char *src = (unsigned char *) PG_GETARG_CSTRING(2);
-	unsigned char *dest = (unsigned char *) PG_GETARG_CSTRING(3);
-	int			len = PG_GETARG_INT32(4);
-	bool		noError = PG_GETARG_BOOL(5);
-	int			converted;
-
-	CHECK_ENCODING_CONVERSION_ARGS(PG_WIN1251, PG_MULE_INTERNAL);
-
-	converted = latin2mic_with_table(src, dest, len, LC_KOI8_R, PG_WIN1251, win12512koi, noError);
-
-	PG_RETURN_INT32(converted);
-}
-
-Datum
-mic_to_win1251(PG_FUNCTION_ARGS)
-{
-	unsigned char *src = (unsigned char *) PG_GETARG_CSTRING(2);
-	unsigned char *dest = (unsigned char *) PG_GETARG_CSTRING(3);
-	int			len = PG_GETARG_INT32(4);
-	bool		noError = PG_GETARG_BOOL(5);
-	int			converted;
-
-	CHECK_ENCODING_CONVERSION_ARGS(PG_MULE_INTERNAL, PG_WIN1251);
-
-	converted = mic2latin_with_table(src, dest, len, LC_KOI8_R, PG_WIN1251, koi2win1251, noError);
-
-	PG_RETURN_INT32(converted);
-}
-
-Datum
-win866_to_mic(PG_FUNCTION_ARGS)
-{
-	unsigned char *src = (unsigned char *) PG_GETARG_CSTRING(2);
-	unsigned char *dest = (unsigned char *) PG_GETARG_CSTRING(3);
-	int			len = PG_GETARG_INT32(4);
-	bool		noError = PG_GETARG_BOOL(5);
-	int			converted;
-
-	CHECK_ENCODING_CONVERSION_ARGS(PG_WIN866, PG_MULE_INTERNAL);
-
-	converted = latin2mic_with_table(src, dest, len, LC_KOI8_R, PG_WIN866, win8662koi, noError);
-
-	PG_RETURN_INT32(converted);
-}
-
-Datum
-mic_to_win866(PG_FUNCTION_ARGS)
-{
-	unsigned char *src = (unsigned char *) PG_GETARG_CSTRING(2);
-	unsigned char *dest = (unsigned char *) PG_GETARG_CSTRING(3);
-	int			len = PG_GETARG_INT32(4);
-	bool		noError = PG_GETARG_BOOL(5);
-	int			converted;
-
-	CHECK_ENCODING_CONVERSION_ARGS(PG_MULE_INTERNAL, PG_WIN866);
-
-	converted = mic2latin_with_table(src, dest, len, LC_KOI8_R, PG_WIN866, koi2win866, noError);
-
-	PG_RETURN_INT32(converted);
-}
-
 Datum
 koi8r_to_win1251(PG_FUNCTION_ARGS)
 {
diff --git a/src/backend/utils/mb/conversion_procs/cyrillic_and_mic/Makefile b/src/backend/utils/mb/conversion_procs/cyrillic_and_mic/Makefile
deleted file mode 100644
index e7cd8e8162a..00000000000
--- a/src/backend/utils/mb/conversion_procs/cyrillic_and_mic/Makefile
+++ /dev/null
@@ -1,13 +0,0 @@
-#-------------------------------------------------------------------------
-#
-# src/backend/utils/mb/conversion_procs/cyrillic_and_mic/Makefile
-#
-#-------------------------------------------------------------------------
-subdir = src/backend/utils/mb/conversion_procs/cyrillic_and_mic
-top_builddir = ../../../../../..
-include $(top_builddir)/src/Makefile.global
-
-NAME		= cyrillic_and_mic
-PGFILEDESC	= "cyrillic <-> mic text conversions"
-
-include $(srcdir)/../proc.mk
diff --git a/src/backend/utils/mb/conversion_procs/euc_cn_and_mic/Makefile b/src/backend/utils/mb/conversion_procs/euc_cn_and_mic/Makefile
deleted file mode 100644
index cb6a83f5841..00000000000
--- a/src/backend/utils/mb/conversion_procs/euc_cn_and_mic/Makefile
+++ /dev/null
@@ -1,13 +0,0 @@
-#-------------------------------------------------------------------------
-#
-# src/backend/utils/mb/conversion_procs/euc_cn_and_mic/Makefile
-#
-#-------------------------------------------------------------------------
-subdir = src/backend/utils/mb/conversion_procs/euc_cn_and_mic
-top_builddir = ../../../../../..
-include $(top_builddir)/src/Makefile.global
-
-NAME		= euc_cn_and_mic
-PGFILEDESC	= "euc_cn <-> mic text conversions"
-
-include $(srcdir)/../proc.mk
diff --git a/src/backend/utils/mb/conversion_procs/euc_cn_and_mic/euc_cn_and_mic.c b/src/backend/utils/mb/conversion_procs/euc_cn_and_mic/euc_cn_and_mic.c
deleted file mode 100644
index 2764d2fb3ef..00000000000
--- a/src/backend/utils/mb/conversion_procs/euc_cn_and_mic/euc_cn_and_mic.c
+++ /dev/null
@@ -1,169 +0,0 @@
-/*-------------------------------------------------------------------------
- *
- *	  EUC_CN and MULE_INTERNAL
- *
- * Portions Copyright (c) 1996-2026, PostgreSQL Global Development Group
- * Portions Copyright (c) 1994, Regents of the University of California
- *
- * IDENTIFICATION
- *	  src/backend/utils/mb/conversion_procs/euc_cn_and_mic/euc_cn_and_mic.c
- *
- *-------------------------------------------------------------------------
- */
-
-#include "postgres.h"
-#include "fmgr.h"
-#include "mb/pg_wchar.h"
-
-PG_MODULE_MAGIC_EXT(
-					.name = "euc_cn_and_mic",
-					.version = PG_VERSION
-);
-
-PG_FUNCTION_INFO_V1(euc_cn_to_mic);
-PG_FUNCTION_INFO_V1(mic_to_euc_cn);
-
-/* ----------
- * conv_proc(
- *		INTEGER,	-- source encoding id
- *		INTEGER,	-- destination encoding id
- *		CSTRING,	-- source string (null terminated C string)
- *		CSTRING,	-- destination string (null terminated C string)
- *		INTEGER,	-- source string length
- *		BOOL		-- if true, don't throw an error if conversion fails
- * ) returns INTEGER;
- *
- * Returns the number of bytes successfully converted.
- * ----------
- */
-
-static int	euc_cn2mic(const unsigned char *euc, unsigned char *p, int len, bool noError);
-static int	mic2euc_cn(const unsigned char *mic, unsigned char *p, int len, bool noError);
-
-Datum
-euc_cn_to_mic(PG_FUNCTION_ARGS)
-{
-	unsigned char *src = (unsigned char *) PG_GETARG_CSTRING(2);
-	unsigned char *dest = (unsigned char *) PG_GETARG_CSTRING(3);
-	int			len = PG_GETARG_INT32(4);
-	bool		noError = PG_GETARG_BOOL(5);
-	int			converted;
-
-	CHECK_ENCODING_CONVERSION_ARGS(PG_EUC_CN, PG_MULE_INTERNAL);
-
-	converted = euc_cn2mic(src, dest, len, noError);
-
-	PG_RETURN_INT32(converted);
-}
-
-Datum
-mic_to_euc_cn(PG_FUNCTION_ARGS)
-{
-	unsigned char *src = (unsigned char *) PG_GETARG_CSTRING(2);
-	unsigned char *dest = (unsigned char *) PG_GETARG_CSTRING(3);
-	int			len = PG_GETARG_INT32(4);
-	bool		noError = PG_GETARG_BOOL(5);
-	int			converted;
-
-	CHECK_ENCODING_CONVERSION_ARGS(PG_MULE_INTERNAL, PG_EUC_CN);
-
-	converted = mic2euc_cn(src, dest, len, noError);
-
-	PG_RETURN_INT32(converted);
-}
-
-/*
- * EUC_CN ---> MIC
- */
-static int
-euc_cn2mic(const unsigned char *euc, unsigned char *p, int len, bool noError)
-{
-	const unsigned char *start = euc;
-	int			c1;
-
-	while (len > 0)
-	{
-		c1 = *euc;
-		if (IS_HIGHBIT_SET(c1))
-		{
-			if (len < 2 || !IS_HIGHBIT_SET(euc[1]))
-			{
-				if (noError)
-					break;
-				report_invalid_encoding(PG_EUC_CN, (const char *) euc, len);
-			}
-			*p++ = LC_GB2312_80;
-			*p++ = c1;
-			*p++ = euc[1];
-			euc += 2;
-			len -= 2;
-		}
-		else
-		{						/* should be ASCII */
-			if (c1 == 0)
-			{
-				if (noError)
-					break;
-				report_invalid_encoding(PG_EUC_CN, (const char *) euc, len);
-			}
-			*p++ = c1;
-			euc++;
-			len--;
-		}
-	}
-	*p = '\0';
-
-	return euc - start;
-}
-
-/*
- * MIC ---> EUC_CN
- */
-static int
-mic2euc_cn(const unsigned char *mic, unsigned char *p, int len, bool noError)
-{
-	const unsigned char *start = mic;
-	int			c1;
-
-	while (len > 0)
-	{
-		c1 = *mic;
-		if (IS_HIGHBIT_SET(c1))
-		{
-			if (c1 != LC_GB2312_80)
-			{
-				if (noError)
-					break;
-				report_untranslatable_char(PG_MULE_INTERNAL, PG_EUC_CN,
-										   (const char *) mic, len);
-			}
-			if (len < 3 || !IS_HIGHBIT_SET(mic[1]) || !IS_HIGHBIT_SET(mic[2]))
-			{
-				if (noError)
-					break;
-				report_invalid_encoding(PG_MULE_INTERNAL,
-										(const char *) mic, len);
-			}
-			mic++;
-			*p++ = *mic++;
-			*p++ = *mic++;
-			len -= 3;
-		}
-		else
-		{						/* should be ASCII */
-			if (c1 == 0)
-			{
-				if (noError)
-					break;
-				report_invalid_encoding(PG_MULE_INTERNAL,
-										(const char *) mic, len);
-			}
-			*p++ = c1;
-			mic++;
-			len--;
-		}
-	}
-	*p = '\0';
-
-	return mic - start;
-}
diff --git a/src/backend/utils/mb/conversion_procs/euc_jp_and_sjis/euc_jp_and_sjis.c b/src/backend/utils/mb/conversion_procs/euc_jp_and_sjis/euc_jp_and_sjis.c
index 3811a124a49..082c803a8eb 100644
--- a/src/backend/utils/mb/conversion_procs/euc_jp_and_sjis/euc_jp_and_sjis.c
+++ b/src/backend/utils/mb/conversion_procs/euc_jp_and_sjis/euc_jp_and_sjis.c
@@ -1,6 +1,6 @@
 /*-------------------------------------------------------------------------
  *
- *	  EUC_JP, SJIS and MULE_INTERNAL
+ *	  EUC_JP and SJIS
  *
  * Portions Copyright (c) 1996-2026, PostgreSQL Global Development Group
  * Portions Copyright (c) 1994, Regents of the University of California
@@ -34,10 +34,6 @@ PG_MODULE_MAGIC_EXT(
 
 PG_FUNCTION_INFO_V1(euc_jp_to_sjis);
 PG_FUNCTION_INFO_V1(sjis_to_euc_jp);
-PG_FUNCTION_INFO_V1(euc_jp_to_mic);
-PG_FUNCTION_INFO_V1(mic_to_euc_jp);
-PG_FUNCTION_INFO_V1(sjis_to_mic);
-PG_FUNCTION_INFO_V1(mic_to_sjis);
 
 /* ----------
  * conv_proc(
@@ -53,10 +49,6 @@ PG_FUNCTION_INFO_V1(mic_to_sjis);
  * ----------
  */
 
-static int	sjis2mic(const unsigned char *sjis, unsigned char *p, int len, bool noError);
-static int	mic2sjis(const unsigned char *mic, unsigned char *p, int len, bool noError);
-static int	euc_jp2mic(const unsigned char *euc, unsigned char *p, int len, bool noError);
-static int	mic2euc_jp(const unsigned char *mic, unsigned char *p, int len, bool noError);
 static int	euc_jp2sjis(const unsigned char *euc, unsigned char *p, int len, bool noError);
 static int	sjis2euc_jp(const unsigned char *sjis, unsigned char *p, int len, bool noError);
 
@@ -92,444 +84,6 @@ sjis_to_euc_jp(PG_FUNCTION_ARGS)
 	PG_RETURN_INT32(converted);
 }
 
-Datum
-euc_jp_to_mic(PG_FUNCTION_ARGS)
-{
-	unsigned char *src = (unsigned char *) PG_GETARG_CSTRING(2);
-	unsigned char *dest = (unsigned char *) PG_GETARG_CSTRING(3);
-	int			len = PG_GETARG_INT32(4);
-	bool		noError = PG_GETARG_BOOL(5);
-	int			converted;
-
-	CHECK_ENCODING_CONVERSION_ARGS(PG_EUC_JP, PG_MULE_INTERNAL);
-
-	converted = euc_jp2mic(src, dest, len, noError);
-
-	PG_RETURN_INT32(converted);
-}
-
-Datum
-mic_to_euc_jp(PG_FUNCTION_ARGS)
-{
-	unsigned char *src = (unsigned char *) PG_GETARG_CSTRING(2);
-	unsigned char *dest = (unsigned char *) PG_GETARG_CSTRING(3);
-	int			len = PG_GETARG_INT32(4);
-	bool		noError = PG_GETARG_BOOL(5);
-	int			converted;
-
-	CHECK_ENCODING_CONVERSION_ARGS(PG_MULE_INTERNAL, PG_EUC_JP);
-
-	converted = mic2euc_jp(src, dest, len, noError);
-
-	PG_RETURN_INT32(converted);
-}
-
-Datum
-sjis_to_mic(PG_FUNCTION_ARGS)
-{
-	unsigned char *src = (unsigned char *) PG_GETARG_CSTRING(2);
-	unsigned char *dest = (unsigned char *) PG_GETARG_CSTRING(3);
-	int			len = PG_GETARG_INT32(4);
-	bool		noError = PG_GETARG_BOOL(5);
-	int			converted;
-
-	CHECK_ENCODING_CONVERSION_ARGS(PG_SJIS, PG_MULE_INTERNAL);
-
-	converted = sjis2mic(src, dest, len, noError);
-
-	PG_RETURN_INT32(converted);
-}
-
-Datum
-mic_to_sjis(PG_FUNCTION_ARGS)
-{
-	unsigned char *src = (unsigned char *) PG_GETARG_CSTRING(2);
-	unsigned char *dest = (unsigned char *) PG_GETARG_CSTRING(3);
-	int			len = PG_GETARG_INT32(4);
-	bool		noError = PG_GETARG_BOOL(5);
-	int			converted;
-
-	CHECK_ENCODING_CONVERSION_ARGS(PG_MULE_INTERNAL, PG_SJIS);
-
-	converted = mic2sjis(src, dest, len, noError);
-
-	PG_RETURN_INT32(converted);
-}
-
-/*
- * SJIS ---> MIC
- */
-static int
-sjis2mic(const unsigned char *sjis, unsigned char *p, int len, bool noError)
-{
-	const unsigned char *start = sjis;
-	int			c1,
-				c2,
-				i,
-				k,
-				k2;
-
-	while (len > 0)
-	{
-		c1 = *sjis;
-		if (c1 >= 0xa1 && c1 <= 0xdf)
-		{
-			/* JIS X0201 (1 byte kana) */
-			*p++ = LC_JISX0201K;
-			*p++ = c1;
-			sjis++;
-			len--;
-		}
-		else if (IS_HIGHBIT_SET(c1))
-		{
-			/*
-			 * JIS X0208, X0212, user defined extended characters
-			 */
-			if (len < 2 || !ISSJISHEAD(c1) || !ISSJISTAIL(sjis[1]))
-			{
-				if (noError)
-					break;
-				report_invalid_encoding(PG_SJIS, (const char *) sjis, len);
-			}
-			c2 = sjis[1];
-			k = (c1 << 8) + c2;
-			if (k >= 0xed40 && k < 0xf040)
-			{
-				/* NEC selection IBM kanji */
-				for (i = 0;; i++)
-				{
-					k2 = ibmkanji[i].nec;
-					if (k2 == 0xffff)
-						break;
-					if (k2 == k)
-					{
-						k = ibmkanji[i].sjis;
-						c1 = (k >> 8) & 0xff;
-						c2 = k & 0xff;
-					}
-				}
-			}
-
-			if (k < 0xeb3f)
-			{
-				/* JIS X0208 */
-				*p++ = LC_JISX0208;
-				*p++ = ((c1 & 0x3f) << 1) + 0x9f + (c2 > 0x9e);
-				*p++ = c2 + ((c2 > 0x9e) ? 2 : 0x60) + (c2 < 0x80);
-			}
-			else if ((k >= 0xeb40 && k < 0xf040) || (k >= 0xfc4c && k <= 0xfcfc))
-			{
-				/* NEC selection IBM kanji - Other undecided justice */
-				*p++ = LC_JISX0208;
-				*p++ = PGEUCALTCODE >> 8;
-				*p++ = PGEUCALTCODE & 0xff;
-			}
-			else if (k >= 0xf040 && k < 0xf540)
-			{
-				/*
-				 * UDC1 mapping to X0208 85 ku - 94 ku JIS code 0x7521 -
-				 * 0x7e7e EUC 0xf5a1 - 0xfefe
-				 */
-				*p++ = LC_JISX0208;
-				c1 -= 0x6f;
-				*p++ = ((c1 & 0x3f) << 1) + 0xf3 + (c2 > 0x9e);
-				*p++ = c2 + ((c2 > 0x9e) ? 2 : 0x60) + (c2 < 0x80);
-			}
-			else if (k >= 0xf540 && k < 0xfa40)
-			{
-				/*
-				 * UDC2 mapping to X0212 85 ku - 94 ku JIS code 0x7521 -
-				 * 0x7e7e EUC 0x8ff5a1 - 0x8ffefe
-				 */
-				*p++ = LC_JISX0212;
-				c1 -= 0x74;
-				*p++ = ((c1 & 0x3f) << 1) + 0xf3 + (c2 > 0x9e);
-				*p++ = c2 + ((c2 > 0x9e) ? 2 : 0x60) + (c2 < 0x80);
-			}
-			else if (k >= 0xfa40)
-			{
-				/*
-				 * mapping IBM kanji to X0208 and X0212
-				 */
-				for (i = 0;; i++)
-				{
-					k2 = ibmkanji[i].sjis;
-					if (k2 == 0xffff)
-						break;
-					if (k2 == k)
-					{
-						k = ibmkanji[i].euc;
-						if (k >= 0x8f0000)
-						{
-							*p++ = LC_JISX0212;
-							*p++ = 0x80 | ((k & 0xff00) >> 8);
-							*p++ = 0x80 | (k & 0xff);
-						}
-						else
-						{
-							*p++ = LC_JISX0208;
-							*p++ = 0x80 | (k >> 8);
-							*p++ = 0x80 | (k & 0xff);
-						}
-					}
-				}
-			}
-			sjis += 2;
-			len -= 2;
-		}
-		else
-		{						/* should be ASCII */
-			if (c1 == 0)
-			{
-				if (noError)
-					break;
-				report_invalid_encoding(PG_SJIS, (const char *) sjis, len);
-			}
-			*p++ = c1;
-			sjis++;
-			len--;
-		}
-	}
-	*p = '\0';
-
-	return sjis - start;
-}
-
-/*
- * MIC ---> SJIS
- */
-static int
-mic2sjis(const unsigned char *mic, unsigned char *p, int len, bool noError)
-{
-	const unsigned char *start = mic;
-	int			c1,
-				c2,
-				k,
-				l;
-
-	while (len > 0)
-	{
-		c1 = *mic;
-		if (!IS_HIGHBIT_SET(c1))
-		{
-			/* ASCII */
-			if (c1 == 0)
-			{
-				if (noError)
-					break;
-				report_invalid_encoding(PG_MULE_INTERNAL,
-										(const char *) mic, len);
-			}
-			*p++ = c1;
-			mic++;
-			len--;
-			continue;
-		}
-		l = pg_encoding_verifymbchar(PG_MULE_INTERNAL, (const char *) mic, len);
-		if (l < 0)
-		{
-			if (noError)
-				break;
-			report_invalid_encoding(PG_MULE_INTERNAL,
-									(const char *) mic, len);
-		}
-		if (c1 == LC_JISX0201K)
-			*p++ = mic[1];
-		else if (c1 == LC_JISX0208)
-		{
-			c1 = mic[1];
-			c2 = mic[2];
-			k = (c1 << 8) | (c2 & 0xff);
-			if (k >= 0xf5a1)
-			{
-				/* UDC1 */
-				c1 -= 0x54;
-				*p++ = ((c1 - 0xa1) >> 1) + ((c1 < 0xdf) ? 0x81 : 0xc1) + 0x6f;
-			}
-			else
-				*p++ = ((c1 - 0xa1) >> 1) + ((c1 < 0xdf) ? 0x81 : 0xc1);
-			*p++ = c2 - ((c1 & 1) ? ((c2 < 0xe0) ? 0x61 : 0x60) : 2);
-		}
-		else if (c1 == LC_JISX0212)
-		{
-			int			i,
-						k2;
-
-			c1 = mic[1];
-			c2 = mic[2];
-			k = c1 << 8 | c2;
-			if (k >= 0xf5a1)
-			{
-				/* UDC2 */
-				c1 -= 0x54;
-				*p++ = ((c1 - 0xa1) >> 1) + ((c1 < 0xdf) ? 0x81 : 0xc1) + 0x74;
-				*p++ = c2 - ((c1 & 1) ? ((c2 < 0xe0) ? 0x61 : 0x60) : 2);
-			}
-			else
-			{
-				/* IBM kanji */
-				for (i = 0;; i++)
-				{
-					k2 = ibmkanji[i].euc & 0xffff;
-					if (k2 == 0xffff)
-					{
-						*p++ = PGSJISALTCODE >> 8;
-						*p++ = PGSJISALTCODE & 0xff;
-						break;
-					}
-					if (k2 == k)
-					{
-						k = ibmkanji[i].sjis;
-						*p++ = k >> 8;
-						*p++ = k & 0xff;
-						break;
-					}
-				}
-			}
-		}
-		else
-		{
-			if (noError)
-				break;
-			report_untranslatable_char(PG_MULE_INTERNAL, PG_SJIS,
-									   (const char *) mic, len);
-		}
-		mic += l;
-		len -= l;
-	}
-	*p = '\0';
-
-	return mic - start;
-}
-
-/*
- * EUC_JP ---> MIC
- */
-static int
-euc_jp2mic(const unsigned char *euc, unsigned char *p, int len, bool noError)
-{
-	const unsigned char *start = euc;
-	int			c1;
-	int			l;
-
-	while (len > 0)
-	{
-		c1 = *euc;
-		if (!IS_HIGHBIT_SET(c1))
-		{
-			/* ASCII */
-			if (c1 == 0)
-			{
-				if (noError)
-					break;
-				report_invalid_encoding(PG_EUC_JP,
-										(const char *) euc, len);
-			}
-			*p++ = c1;
-			euc++;
-			len--;
-			continue;
-		}
-		l = pg_encoding_verifymbchar(PG_EUC_JP, (const char *) euc, len);
-		if (l < 0)
-		{
-			if (noError)
-				break;
-			report_invalid_encoding(PG_EUC_JP,
-									(const char *) euc, len);
-		}
-		if (c1 == SS2)
-		{						/* 1 byte kana? */
-			*p++ = LC_JISX0201K;
-			*p++ = euc[1];
-		}
-		else if (c1 == SS3)
-		{						/* JIS X0212 kanji? */
-			*p++ = LC_JISX0212;
-			*p++ = euc[1];
-			*p++ = euc[2];
-		}
-		else
-		{						/* kanji? */
-			*p++ = LC_JISX0208;
-			*p++ = c1;
-			*p++ = euc[1];
-		}
-		euc += l;
-		len -= l;
-	}
-	*p = '\0';
-
-	return euc - start;
-}
-
-/*
- * MIC ---> EUC_JP
- */
-static int
-mic2euc_jp(const unsigned char *mic, unsigned char *p, int len, bool noError)
-{
-	const unsigned char *start = mic;
-	int			c1;
-	int			l;
-
-	while (len > 0)
-	{
-		c1 = *mic;
-		if (!IS_HIGHBIT_SET(c1))
-		{
-			/* ASCII */
-			if (c1 == 0)
-			{
-				if (noError)
-					break;
-				report_invalid_encoding(PG_MULE_INTERNAL,
-										(const char *) mic, len);
-			}
-			*p++ = c1;
-			mic++;
-			len--;
-			continue;
-		}
-		l = pg_encoding_verifymbchar(PG_MULE_INTERNAL, (const char *) mic, len);
-		if (l < 0)
-		{
-			if (noError)
-				break;
-			report_invalid_encoding(PG_MULE_INTERNAL,
-									(const char *) mic, len);
-		}
-		if (c1 == LC_JISX0201K)
-		{
-			*p++ = SS2;
-			*p++ = mic[1];
-		}
-		else if (c1 == LC_JISX0212)
-		{
-			*p++ = SS3;
-			*p++ = mic[1];
-			*p++ = mic[2];
-		}
-		else if (c1 == LC_JISX0208)
-		{
-			*p++ = mic[1];
-			*p++ = mic[2];
-		}
-		else
-		{
-			if (noError)
-				break;
-			report_untranslatable_char(PG_MULE_INTERNAL, PG_EUC_JP,
-									   (const char *) mic, len);
-		}
-		mic += l;
-		len -= l;
-	}
-	*p = '\0';
-
-	return mic - start;
-}
-
 /*
  * EUC_JP -> SJIS
  */
diff --git a/src/backend/utils/mb/conversion_procs/euc_kr_and_mic/Makefile b/src/backend/utils/mb/conversion_procs/euc_kr_and_mic/Makefile
deleted file mode 100644
index d43b082bd5f..00000000000
--- a/src/backend/utils/mb/conversion_procs/euc_kr_and_mic/Makefile
+++ /dev/null
@@ -1,13 +0,0 @@
-#-------------------------------------------------------------------------
-#
-# src/backend/utils/mb/conversion_procs/euc_kr_and_mic/Makefile
-#
-#-------------------------------------------------------------------------
-subdir = src/backend/utils/mb/conversion_procs/euc_kr_and_mic
-top_builddir = ../../../../../..
-include $(top_builddir)/src/Makefile.global
-
-NAME		= euc_kr_and_mic
-PGFILEDESC	= "euc_kr <-> mic text conversions"
-
-include $(srcdir)/../proc.mk
diff --git a/src/backend/utils/mb/conversion_procs/euc_kr_and_mic/euc_kr_and_mic.c b/src/backend/utils/mb/conversion_procs/euc_kr_and_mic/euc_kr_and_mic.c
deleted file mode 100644
index 7b9e31741fc..00000000000
--- a/src/backend/utils/mb/conversion_procs/euc_kr_and_mic/euc_kr_and_mic.c
+++ /dev/null
@@ -1,177 +0,0 @@
-/*-------------------------------------------------------------------------
- *
- *	  EUC_KR and MULE_INTERNAL
- *
- * Portions Copyright (c) 1996-2026, PostgreSQL Global Development Group
- * Portions Copyright (c) 1994, Regents of the University of California
- *
- * IDENTIFICATION
- *	  src/backend/utils/mb/conversion_procs/euc_kr_and_mic/euc_kr_and_mic.c
- *
- *-------------------------------------------------------------------------
- */
-
-#include "postgres.h"
-#include "fmgr.h"
-#include "mb/pg_wchar.h"
-
-PG_MODULE_MAGIC_EXT(
-					.name = "euc_kr_and_mic",
-					.version = PG_VERSION
-);
-
-PG_FUNCTION_INFO_V1(euc_kr_to_mic);
-PG_FUNCTION_INFO_V1(mic_to_euc_kr);
-
-/* ----------
- * conv_proc(
- *		INTEGER,	-- source encoding id
- *		INTEGER,	-- destination encoding id
- *		CSTRING,	-- source string (null terminated C string)
- *		CSTRING,	-- destination string (null terminated C string)
- *		INTEGER,	-- source string length
- *		BOOL		-- if true, don't throw an error if conversion fails
- * ) returns INTEGER;
- *
- * Returns the number of bytes successfully converted.
- * ----------
- */
-
-static int	euc_kr2mic(const unsigned char *euc, unsigned char *p, int len, bool noError);
-static int	mic2euc_kr(const unsigned char *mic, unsigned char *p, int len, bool noError);
-
-Datum
-euc_kr_to_mic(PG_FUNCTION_ARGS)
-{
-	unsigned char *src = (unsigned char *) PG_GETARG_CSTRING(2);
-	unsigned char *dest = (unsigned char *) PG_GETARG_CSTRING(3);
-	int			len = PG_GETARG_INT32(4);
-	bool		noError = PG_GETARG_BOOL(5);
-	int			converted;
-
-	CHECK_ENCODING_CONVERSION_ARGS(PG_EUC_KR, PG_MULE_INTERNAL);
-
-	converted = euc_kr2mic(src, dest, len, noError);
-
-	PG_RETURN_INT32(converted);
-}
-
-Datum
-mic_to_euc_kr(PG_FUNCTION_ARGS)
-{
-	unsigned char *src = (unsigned char *) PG_GETARG_CSTRING(2);
-	unsigned char *dest = (unsigned char *) PG_GETARG_CSTRING(3);
-	int			len = PG_GETARG_INT32(4);
-	bool		noError = PG_GETARG_BOOL(5);
-	int			converted;
-
-	CHECK_ENCODING_CONVERSION_ARGS(PG_MULE_INTERNAL, PG_EUC_KR);
-
-	converted = mic2euc_kr(src, dest, len, noError);
-
-	PG_RETURN_INT32(converted);
-}
-
-/*
- * EUC_KR ---> MIC
- */
-static int
-euc_kr2mic(const unsigned char *euc, unsigned char *p, int len, bool noError)
-{
-	const unsigned char *start = euc;
-	int			c1;
-	int			l;
-
-	while (len > 0)
-	{
-		c1 = *euc;
-		if (IS_HIGHBIT_SET(c1))
-		{
-			l = pg_encoding_verifymbchar(PG_EUC_KR, (const char *) euc, len);
-			if (l != 2)
-			{
-				if (noError)
-					break;
-				report_invalid_encoding(PG_EUC_KR,
-										(const char *) euc, len);
-			}
-			*p++ = LC_KS5601;
-			*p++ = c1;
-			*p++ = euc[1];
-			euc += 2;
-			len -= 2;
-		}
-		else
-		{						/* should be ASCII */
-			if (c1 == 0)
-			{
-				if (noError)
-					break;
-				report_invalid_encoding(PG_EUC_KR,
-										(const char *) euc, len);
-			}
-			*p++ = c1;
-			euc++;
-			len--;
-		}
-	}
-	*p = '\0';
-
-	return euc - start;
-}
-
-/*
- * MIC ---> EUC_KR
- */
-static int
-mic2euc_kr(const unsigned char *mic, unsigned char *p, int len, bool noError)
-{
-	const unsigned char *start = mic;
-	int			c1;
-	int			l;
-
-	while (len > 0)
-	{
-		c1 = *mic;
-		if (!IS_HIGHBIT_SET(c1))
-		{
-			/* ASCII */
-			if (c1 == 0)
-			{
-				if (noError)
-					break;
-				report_invalid_encoding(PG_MULE_INTERNAL,
-										(const char *) mic, len);
-			}
-			*p++ = c1;
-			mic++;
-			len--;
-			continue;
-		}
-		l = pg_encoding_verifymbchar(PG_MULE_INTERNAL, (const char *) mic, len);
-		if (l < 0)
-		{
-			if (noError)
-				break;
-			report_invalid_encoding(PG_MULE_INTERNAL,
-									(const char *) mic, len);
-		}
-		if (c1 == LC_KS5601)
-		{
-			*p++ = mic[1];
-			*p++ = mic[2];
-		}
-		else
-		{
-			if (noError)
-				break;
-			report_untranslatable_char(PG_MULE_INTERNAL, PG_EUC_KR,
-									   (const char *) mic, len);
-		}
-		mic += l;
-		len -= l;
-	}
-	*p = '\0';
-
-	return mic - start;
-}
diff --git a/src/backend/utils/mb/conversion_procs/euc_tw_and_big5/big5.c b/src/backend/utils/mb/conversion_procs/euc_tw_and_big5/big5.c
index 68f76aa8cb8..c84c7ed0e39 100644
--- a/src/backend/utils/mb/conversion_procs/euc_tw_and_big5/big5.c
+++ b/src/backend/utils/mb/conversion_procs/euc_tw_and_big5/big5.c
@@ -1,6 +1,5 @@
 /*
- * conversion between BIG5 and Mule Internal Code(CNS 116643-1992
- * plane 1 and plane 2).
+ * BIG5 support functions (CNS 116643-1992 * plane 1 and plane 2).
  * This program is partially copied from lv(Multilingual file viewer)
  * and slightly modified. lv is written and copyrighted by NARITA Tomio
  * (nrt@web.ad.jp).
diff --git a/src/backend/utils/mb/conversion_procs/euc_tw_and_big5/euc_tw_and_big5.c b/src/backend/utils/mb/conversion_procs/euc_tw_and_big5/euc_tw_and_big5.c
index 8db3c796f1a..4dac49b3b90 100644
--- a/src/backend/utils/mb/conversion_procs/euc_tw_and_big5/euc_tw_and_big5.c
+++ b/src/backend/utils/mb/conversion_procs/euc_tw_and_big5/euc_tw_and_big5.c
@@ -1,6 +1,6 @@
 /*-------------------------------------------------------------------------
  *
- *	  EUC_TW, BIG5 and MULE_INTERNAL
+ *	  EUC_TW and BIG5
  *
  * Portions Copyright (c) 1996-2026, PostgreSQL Global Development Group
  * Portions Copyright (c) 1994, Regents of the University of California
@@ -22,10 +22,6 @@ PG_MODULE_MAGIC_EXT(
 
 PG_FUNCTION_INFO_V1(euc_tw_to_big5);
 PG_FUNCTION_INFO_V1(big5_to_euc_tw);
-PG_FUNCTION_INFO_V1(euc_tw_to_mic);
-PG_FUNCTION_INFO_V1(mic_to_euc_tw);
-PG_FUNCTION_INFO_V1(big5_to_mic);
-PG_FUNCTION_INFO_V1(mic_to_big5);
 
 /* ----------
  * conv_proc(
@@ -43,10 +39,6 @@ PG_FUNCTION_INFO_V1(mic_to_big5);
 
 static int	euc_tw2big5(const unsigned char *euc, unsigned char *p, int len, bool noError);
 static int	big52euc_tw(const unsigned char *big5, unsigned char *p, int len, bool noError);
-static int	big52mic(const unsigned char *big5, unsigned char *p, int len, bool noError);
-static int	mic2big5(const unsigned char *mic, unsigned char *p, int len, bool noError);
-static int	euc_tw2mic(const unsigned char *euc, unsigned char *p, int len, bool noError);
-static int	mic2euc_tw(const unsigned char *mic, unsigned char *p, int len, bool noError);
 
 Datum
 euc_tw_to_big5(PG_FUNCTION_ARGS)
@@ -80,74 +72,6 @@ big5_to_euc_tw(PG_FUNCTION_ARGS)
 	PG_RETURN_INT32(converted);
 }
 
-Datum
-euc_tw_to_mic(PG_FUNCTION_ARGS)
-{
-	unsigned char *src = (unsigned char *) PG_GETARG_CSTRING(2);
-	unsigned char *dest = (unsigned char *) PG_GETARG_CSTRING(3);
-	int			len = PG_GETARG_INT32(4);
-	bool		noError = PG_GETARG_BOOL(5);
-	int			converted;
-
-	CHECK_ENCODING_CONVERSION_ARGS(PG_EUC_TW, PG_MULE_INTERNAL);
-
-	converted = euc_tw2mic(src, dest, len, noError);
-
-	PG_RETURN_INT32(converted);
-}
-
-Datum
-mic_to_euc_tw(PG_FUNCTION_ARGS)
-{
-	unsigned char *src = (unsigned char *) PG_GETARG_CSTRING(2);
-	unsigned char *dest = (unsigned char *) PG_GETARG_CSTRING(3);
-	int			len = PG_GETARG_INT32(4);
-	bool		noError = PG_GETARG_BOOL(5);
-	int			converted;
-
-	CHECK_ENCODING_CONVERSION_ARGS(PG_MULE_INTERNAL, PG_EUC_TW);
-
-	converted = mic2euc_tw(src, dest, len, noError);
-
-	PG_RETURN_INT32(converted);
-}
-
-Datum
-big5_to_mic(PG_FUNCTION_ARGS)
-{
-	unsigned char *src = (unsigned char *) PG_GETARG_CSTRING(2);
-	unsigned char *dest = (unsigned char *) PG_GETARG_CSTRING(3);
-	int			len = PG_GETARG_INT32(4);
-	bool		noError = PG_GETARG_BOOL(5);
-	int			converted;
-
-	CHECK_ENCODING_CONVERSION_ARGS(PG_BIG5, PG_MULE_INTERNAL);
-
-	converted = big52mic(src, dest, len, noError);
-
-	PG_RETURN_INT32(converted);
-}
-
-Datum
-mic_to_big5(PG_FUNCTION_ARGS)
-{
-	unsigned char *src = (unsigned char *) PG_GETARG_CSTRING(2);
-	unsigned char *dest = (unsigned char *) PG_GETARG_CSTRING(3);
-	int			len = PG_GETARG_INT32(4);
-	bool		noError = PG_GETARG_BOOL(5);
-	int			converted;
-
-	CHECK_ENCODING_CONVERSION_ARGS(PG_MULE_INTERNAL, PG_BIG5);
-
-	converted = mic2big5(src, dest, len, noError);
-
-	PG_RETURN_INT32(converted);
-}
-
-
-/*
- * EUC_TW ---> Big5
- */
 static int
 euc_tw2big5(const unsigned char *euc, unsigned char *p, int len, bool noError)
 {
@@ -303,281 +227,3 @@ big52euc_tw(const unsigned char *big5, unsigned char *p, int len, bool noError)
 
 	return big5 - start;
 }
-
-/*
- * EUC_TW ---> MIC
- */
-static int
-euc_tw2mic(const unsigned char *euc, unsigned char *p, int len, bool noError)
-{
-	const unsigned char *start = euc;
-	int			c1;
-	int			l;
-
-	while (len > 0)
-	{
-		c1 = *euc;
-		if (IS_HIGHBIT_SET(c1))
-		{
-			l = pg_encoding_verifymbchar(PG_EUC_TW, (const char *) euc, len);
-			if (l < 0)
-			{
-				if (noError)
-					break;
-				report_invalid_encoding(PG_EUC_TW,
-										(const char *) euc, len);
-			}
-			if (c1 == SS2)
-			{
-				c1 = euc[1];	/* plane No. */
-				if (c1 == 0xa1)
-					*p++ = LC_CNS11643_1;
-				else if (c1 == 0xa2)
-					*p++ = LC_CNS11643_2;
-				else
-				{
-					/* other planes are MULE private charsets */
-					*p++ = LCPRV2_B;
-					*p++ = c1 - 0xa3 + LC_CNS11643_3;
-				}
-				*p++ = euc[2];
-				*p++ = euc[3];
-			}
-			else
-			{					/* CNS11643-1 */
-				*p++ = LC_CNS11643_1;
-				*p++ = c1;
-				*p++ = euc[1];
-			}
-			euc += l;
-			len -= l;
-		}
-		else
-		{						/* should be ASCII */
-			if (c1 == 0)
-			{
-				if (noError)
-					break;
-				report_invalid_encoding(PG_EUC_TW,
-										(const char *) euc, len);
-			}
-			*p++ = c1;
-			euc++;
-			len--;
-		}
-	}
-	*p = '\0';
-
-	return euc - start;
-}
-
-/*
- * MIC ---> EUC_TW
- */
-static int
-mic2euc_tw(const unsigned char *mic, unsigned char *p, int len, bool noError)
-{
-	const unsigned char *start = mic;
-	int			c1;
-	int			l;
-
-	while (len > 0)
-	{
-		c1 = *mic;
-		if (!IS_HIGHBIT_SET(c1))
-		{
-			/* ASCII */
-			if (c1 == 0)
-			{
-				if (noError)
-					break;
-				report_invalid_encoding(PG_MULE_INTERNAL,
-										(const char *) mic, len);
-			}
-			*p++ = c1;
-			mic++;
-			len--;
-			continue;
-		}
-		l = pg_encoding_verifymbchar(PG_MULE_INTERNAL, (const char *) mic, len);
-		if (l < 0)
-		{
-			if (noError)
-				break;
-			report_invalid_encoding(PG_MULE_INTERNAL,
-									(const char *) mic, len);
-		}
-		if (c1 == LC_CNS11643_1)
-		{
-			*p++ = mic[1];
-			*p++ = mic[2];
-		}
-		else if (c1 == LC_CNS11643_2)
-		{
-			*p++ = SS2;
-			*p++ = 0xa2;
-			*p++ = mic[1];
-			*p++ = mic[2];
-		}
-		else if (c1 == LCPRV2_B &&
-				 mic[1] >= LC_CNS11643_3 && mic[1] <= LC_CNS11643_7)
-		{
-			*p++ = SS2;
-			*p++ = mic[1] - LC_CNS11643_3 + 0xa3;
-			*p++ = mic[2];
-			*p++ = mic[3];
-		}
-		else
-		{
-			if (noError)
-				break;
-			report_untranslatable_char(PG_MULE_INTERNAL, PG_EUC_TW,
-									   (const char *) mic, len);
-		}
-		mic += l;
-		len -= l;
-	}
-	*p = '\0';
-
-	return mic - start;
-}
-
-/*
- * Big5 ---> MIC
- */
-static int
-big52mic(const unsigned char *big5, unsigned char *p, int len, bool noError)
-{
-	const unsigned char *start = big5;
-	unsigned short c1;
-	unsigned short big5buf,
-				cnsBuf;
-	unsigned char lc;
-	int			l;
-
-	while (len > 0)
-	{
-		c1 = *big5;
-		if (!IS_HIGHBIT_SET(c1))
-		{
-			/* ASCII */
-			if (c1 == 0)
-			{
-				if (noError)
-					break;
-				report_invalid_encoding(PG_BIG5,
-										(const char *) big5, len);
-			}
-			*p++ = c1;
-			big5++;
-			len--;
-			continue;
-		}
-		l = pg_encoding_verifymbchar(PG_BIG5, (const char *) big5, len);
-		if (l < 0)
-		{
-			if (noError)
-				break;
-			report_invalid_encoding(PG_BIG5,
-									(const char *) big5, len);
-		}
-		big5buf = (c1 << 8) | big5[1];
-		cnsBuf = BIG5toCNS(big5buf, &lc);
-		if (lc != 0)
-		{
-			/* Planes 3 and 4 are MULE private charsets */
-			if (lc == LC_CNS11643_3 || lc == LC_CNS11643_4)
-				*p++ = LCPRV2_B;
-			*p++ = lc;			/* Plane No. */
-			*p++ = (cnsBuf >> 8) & 0x00ff;
-			*p++ = cnsBuf & 0x00ff;
-		}
-		else
-		{
-			if (noError)
-				break;
-			report_untranslatable_char(PG_BIG5, PG_MULE_INTERNAL,
-									   (const char *) big5, len);
-		}
-		big5 += l;
-		len -= l;
-	}
-	*p = '\0';
-
-	return big5 - start;
-}
-
-/*
- * MIC ---> Big5
- */
-static int
-mic2big5(const unsigned char *mic, unsigned char *p, int len, bool noError)
-{
-	const unsigned char *start = mic;
-	unsigned short c1;
-	unsigned short big5buf,
-				cnsBuf;
-	int			l;
-
-	while (len > 0)
-	{
-		c1 = *mic;
-		if (!IS_HIGHBIT_SET(c1))
-		{
-			/* ASCII */
-			if (c1 == 0)
-			{
-				if (noError)
-					break;
-				report_invalid_encoding(PG_MULE_INTERNAL,
-										(const char *) mic, len);
-			}
-			*p++ = c1;
-			mic++;
-			len--;
-			continue;
-		}
-		l = pg_encoding_verifymbchar(PG_MULE_INTERNAL, (const char *) mic, len);
-		if (l < 0)
-		{
-			if (noError)
-				break;
-			report_invalid_encoding(PG_MULE_INTERNAL,
-									(const char *) mic, len);
-		}
-		if (c1 == LC_CNS11643_1 || c1 == LC_CNS11643_2 || c1 == LCPRV2_B)
-		{
-			if (c1 == LCPRV2_B)
-			{
-				c1 = mic[1];	/* get plane no. */
-				cnsBuf = (mic[2] << 8) | mic[3];
-			}
-			else
-			{
-				cnsBuf = (mic[1] << 8) | mic[2];
-			}
-			big5buf = CNStoBIG5(cnsBuf, c1);
-			if (big5buf == 0)
-			{
-				if (noError)
-					break;
-				report_untranslatable_char(PG_MULE_INTERNAL, PG_BIG5,
-										   (const char *) mic, len);
-			}
-			*p++ = (big5buf >> 8) & 0x00ff;
-			*p++ = big5buf & 0x00ff;
-		}
-		else
-		{
-			if (noError)
-				break;
-			report_untranslatable_char(PG_MULE_INTERNAL, PG_BIG5,
-									   (const char *) mic, len);
-		}
-		mic += l;
-		len -= l;
-	}
-	*p = '\0';
-
-	return mic - start;
-}
diff --git a/src/backend/utils/mb/conversion_procs/latin2_and_win1250/latin2_and_win1250.c b/src/backend/utils/mb/conversion_procs/latin2_and_win1250/latin2_and_win1250.c
index aa46641d56d..29201c94434 100644
--- a/src/backend/utils/mb/conversion_procs/latin2_and_win1250/latin2_and_win1250.c
+++ b/src/backend/utils/mb/conversion_procs/latin2_and_win1250/latin2_and_win1250.c
@@ -20,10 +20,6 @@ PG_MODULE_MAGIC_EXT(
 					.version = PG_VERSION
 );
 
-PG_FUNCTION_INFO_V1(latin2_to_mic);
-PG_FUNCTION_INFO_V1(mic_to_latin2);
-PG_FUNCTION_INFO_V1(win1250_to_mic);
-PG_FUNCTION_INFO_V1(mic_to_win1250);
 PG_FUNCTION_INFO_V1(latin2_to_win1250);
 PG_FUNCTION_INFO_V1(win1250_to_latin2);
 
@@ -82,72 +78,6 @@ static const unsigned char iso88592_2_win1250[] = {
 };
 
 
-Datum
-latin2_to_mic(PG_FUNCTION_ARGS)
-{
-	unsigned char *src = (unsigned char *) PG_GETARG_CSTRING(2);
-	unsigned char *dest = (unsigned char *) PG_GETARG_CSTRING(3);
-	int			len = PG_GETARG_INT32(4);
-	bool		noError = PG_GETARG_BOOL(5);
-	int			converted;
-
-	CHECK_ENCODING_CONVERSION_ARGS(PG_LATIN2, PG_MULE_INTERNAL);
-
-	converted = latin2mic(src, dest, len, LC_ISO8859_2, PG_LATIN2, noError);
-
-	PG_RETURN_INT32(converted);
-}
-
-Datum
-mic_to_latin2(PG_FUNCTION_ARGS)
-{
-	unsigned char *src = (unsigned char *) PG_GETARG_CSTRING(2);
-	unsigned char *dest = (unsigned char *) PG_GETARG_CSTRING(3);
-	int			len = PG_GETARG_INT32(4);
-	bool		noError = PG_GETARG_BOOL(5);
-	int			converted;
-
-	CHECK_ENCODING_CONVERSION_ARGS(PG_MULE_INTERNAL, PG_LATIN2);
-
-	converted = mic2latin(src, dest, len, LC_ISO8859_2, PG_LATIN2, noError);
-
-	PG_RETURN_INT32(converted);
-}
-
-Datum
-win1250_to_mic(PG_FUNCTION_ARGS)
-{
-	unsigned char *src = (unsigned char *) PG_GETARG_CSTRING(2);
-	unsigned char *dest = (unsigned char *) PG_GETARG_CSTRING(3);
-	int			len = PG_GETARG_INT32(4);
-	bool		noError = PG_GETARG_BOOL(5);
-	int			converted;
-
-	CHECK_ENCODING_CONVERSION_ARGS(PG_WIN1250, PG_MULE_INTERNAL);
-
-	converted = latin2mic_with_table(src, dest, len, LC_ISO8859_2, PG_WIN1250,
-									 win1250_2_iso88592, noError);
-
-	PG_RETURN_INT32(converted);
-}
-
-Datum
-mic_to_win1250(PG_FUNCTION_ARGS)
-{
-	unsigned char *src = (unsigned char *) PG_GETARG_CSTRING(2);
-	unsigned char *dest = (unsigned char *) PG_GETARG_CSTRING(3);
-	int			len = PG_GETARG_INT32(4);
-	bool		noError = PG_GETARG_BOOL(5);
-	int			converted;
-
-	CHECK_ENCODING_CONVERSION_ARGS(PG_MULE_INTERNAL, PG_WIN1250);
-
-	converted = mic2latin_with_table(src, dest, len, LC_ISO8859_2, PG_WIN1250,
-									 iso88592_2_win1250, noError);
-
-	PG_RETURN_INT32(converted);
-}
-
 Datum
 latin2_to_win1250(PG_FUNCTION_ARGS)
 {
diff --git a/src/backend/utils/mb/conversion_procs/latin_and_mic/latin_and_mic.c b/src/backend/utils/mb/conversion_procs/latin_and_mic/latin_and_mic.c
deleted file mode 100644
index 3b43e56056b..00000000000
--- a/src/backend/utils/mb/conversion_procs/latin_and_mic/latin_and_mic.c
+++ /dev/null
@@ -1,139 +0,0 @@
-/*-------------------------------------------------------------------------
- *
- *	  LATINn and MULE_INTERNAL
- *
- * Portions Copyright (c) 1996-2026, PostgreSQL Global Development Group
- * Portions Copyright (c) 1994, Regents of the University of California
- *
- * IDENTIFICATION
- *	  src/backend/utils/mb/conversion_procs/latin_and_mic/latin_and_mic.c
- *
- *-------------------------------------------------------------------------
- */
-
-#include "postgres.h"
-#include "fmgr.h"
-#include "mb/pg_wchar.h"
-
-PG_MODULE_MAGIC_EXT(
-					.name = "latin_and_mic",
-					.version = PG_VERSION
-);
-
-PG_FUNCTION_INFO_V1(latin1_to_mic);
-PG_FUNCTION_INFO_V1(mic_to_latin1);
-PG_FUNCTION_INFO_V1(latin3_to_mic);
-PG_FUNCTION_INFO_V1(mic_to_latin3);
-PG_FUNCTION_INFO_V1(latin4_to_mic);
-PG_FUNCTION_INFO_V1(mic_to_latin4);
-
-/* ----------
- * conv_proc(
- *		INTEGER,	-- source encoding id
- *		INTEGER,	-- destination encoding id
- *		CSTRING,	-- source string (null terminated C string)
- *		CSTRING,	-- destination string (null terminated C string)
- *		INTEGER,	-- source string length
- *		BOOL		-- if true, don't throw an error if conversion fails
- * ) returns INTEGER;
- *
- * Returns the number of bytes successfully converted.
- * ----------
- */
-
-
-Datum
-latin1_to_mic(PG_FUNCTION_ARGS)
-{
-	unsigned char *src = (unsigned char *) PG_GETARG_CSTRING(2);
-	unsigned char *dest = (unsigned char *) PG_GETARG_CSTRING(3);
-	int			len = PG_GETARG_INT32(4);
-	bool		noError = PG_GETARG_BOOL(5);
-	int			converted;
-
-	CHECK_ENCODING_CONVERSION_ARGS(PG_LATIN1, PG_MULE_INTERNAL);
-
-	converted = latin2mic(src, dest, len, LC_ISO8859_1, PG_LATIN1, noError);
-
-	PG_RETURN_INT32(converted);
-}
-
-Datum
-mic_to_latin1(PG_FUNCTION_ARGS)
-{
-	unsigned char *src = (unsigned char *) PG_GETARG_CSTRING(2);
-	unsigned char *dest = (unsigned char *) PG_GETARG_CSTRING(3);
-	int			len = PG_GETARG_INT32(4);
-	bool		noError = PG_GETARG_BOOL(5);
-	int			converted;
-
-	CHECK_ENCODING_CONVERSION_ARGS(PG_MULE_INTERNAL, PG_LATIN1);
-
-	converted = mic2latin(src, dest, len, LC_ISO8859_1, PG_LATIN1, noError);
-
-	PG_RETURN_INT32(converted);
-}
-
-Datum
-latin3_to_mic(PG_FUNCTION_ARGS)
-{
-	unsigned char *src = (unsigned char *) PG_GETARG_CSTRING(2);
-	unsigned char *dest = (unsigned char *) PG_GETARG_CSTRING(3);
-	int			len = PG_GETARG_INT32(4);
-	bool		noError = PG_GETARG_BOOL(5);
-	int			converted;
-
-	CHECK_ENCODING_CONVERSION_ARGS(PG_LATIN3, PG_MULE_INTERNAL);
-
-	converted = latin2mic(src, dest, len, LC_ISO8859_3, PG_LATIN3, noError);
-
-	PG_RETURN_INT32(converted);
-}
-
-Datum
-mic_to_latin3(PG_FUNCTION_ARGS)
-{
-	unsigned char *src = (unsigned char *) PG_GETARG_CSTRING(2);
-	unsigned char *dest = (unsigned char *) PG_GETARG_CSTRING(3);
-	int			len = PG_GETARG_INT32(4);
-	bool		noError = PG_GETARG_BOOL(5);
-	int			converted;
-
-	CHECK_ENCODING_CONVERSION_ARGS(PG_MULE_INTERNAL, PG_LATIN3);
-
-	converted = mic2latin(src, dest, len, LC_ISO8859_3, PG_LATIN3, noError);
-
-	PG_RETURN_INT32(converted);
-}
-
-Datum
-latin4_to_mic(PG_FUNCTION_ARGS)
-{
-	unsigned char *src = (unsigned char *) PG_GETARG_CSTRING(2);
-	unsigned char *dest = (unsigned char *) PG_GETARG_CSTRING(3);
-	int			len = PG_GETARG_INT32(4);
-	bool		noError = PG_GETARG_BOOL(5);
-	int			converted;
-
-	CHECK_ENCODING_CONVERSION_ARGS(PG_LATIN4, PG_MULE_INTERNAL);
-
-	converted = latin2mic(src, dest, len, LC_ISO8859_4, PG_LATIN4, noError);
-
-	PG_RETURN_INT32(converted);
-}
-
-Datum
-mic_to_latin4(PG_FUNCTION_ARGS)
-{
-	unsigned char *src = (unsigned char *) PG_GETARG_CSTRING(2);
-	unsigned char *dest = (unsigned char *) PG_GETARG_CSTRING(3);
-	int			len = PG_GETARG_INT32(4);
-	bool		noError = PG_GETARG_BOOL(5);
-	int			converted;
-
-	CHECK_ENCODING_CONVERSION_ARGS(PG_MULE_INTERNAL, PG_LATIN4);
-
-	converted = mic2latin(src, dest, len, LC_ISO8859_4, PG_LATIN4, noError);
-
-	PG_RETURN_INT32(converted);
-}
diff --git a/src/backend/utils/mb/conversion_procs/meson.build b/src/backend/utils/mb/conversion_procs/meson.build
index 404afdde360..6c6fd30a01f 100644
--- a/src/backend/utils/mb/conversion_procs/meson.build
+++ b/src/backend/utils/mb/conversion_procs/meson.build
@@ -1,17 +1,14 @@
 # Copyright (c) 2022-2026, PostgreSQL Global Development Group
 
 encodings = {
-  'cyrillic_and_mic': ['cyrillic_and_mic/cyrillic_and_mic.c'],
+  'cyrillic': ['cyrillic/cyrillic.c'],
   'euc2004_sjis2004': ['euc2004_sjis2004/euc2004_sjis2004.c'],
-  'euc_cn_and_mic': ['euc_cn_and_mic/euc_cn_and_mic.c'],
   'euc_jp_and_sjis': ['euc_jp_and_sjis/euc_jp_and_sjis.c'],
-  'euc_kr_and_mic': ['euc_kr_and_mic/euc_kr_and_mic.c'],
   'euc_tw_and_big5': [
     'euc_tw_and_big5/euc_tw_and_big5.c',
     'euc_tw_and_big5/big5.c',
   ],
   'latin2_and_win1250': ['latin2_and_win1250/latin2_and_win1250.c'],
-  'latin_and_mic': ['latin_and_mic/latin_and_mic.c'],
   'utf8_and_big5': ['utf8_and_big5/utf8_and_big5.c'],
   'utf8_and_cyrillic': ['utf8_and_cyrillic/utf8_and_cyrillic.c'],
   'utf8_and_euc2004': ['utf8_and_euc2004/utf8_and_euc2004.c'],
diff --git a/src/backend/utils/mb/mbutils.c b/src/backend/utils/mb/mbutils.c
index a5a734839af..6009ee2b988 100644
--- a/src/backend/utils/mb/mbutils.c
+++ b/src/backend/utils/mb/mbutils.c
@@ -1306,8 +1306,7 @@ SetMessageEncoding(int encoding)
 #ifdef ENABLE_NLS
 /*
  * Make one bind_textdomain_codeset() call, translating a pg_enc to a gettext
- * codeset.  Fails for MULE_INTERNAL, an encoding unknown to gettext; can also
- * fail for gettext-internal causes like out-of-memory.
+ * codeset.  Can fail for gettext-internal causes like out-of-memory.
  */
 static bool
 raw_pg_bind_textdomain_codeset(const char *domainname, int encoding)
@@ -1427,8 +1426,7 @@ PG_encoding_to_char(PG_FUNCTION_ARGS)
 /*
  * gettext() returns messages in this encoding.  This often matches the
  * database encoding, but it differs for SQL_ASCII databases, for processes
- * not attached to a database, and under a database encoding lacking iconv
- * support (MULE_INTERNAL).
+ * not attached to a database.
  */
 int
 GetMessageEncoding(void)
diff --git a/src/common/encnames.c b/src/common/encnames.c
index f833ae8edfe..9085dbecce1 100644
--- a/src/common/encnames.c
+++ b/src/common/encnames.c
@@ -164,9 +164,6 @@ static const pg_encname pg_encname_tbl[] =
 	{
 		"mskanji", PG_SJIS
 	},							/* alias for Shift_JIS */
-	{
-		"muleinternal", PG_MULE_INTERNAL
-	},
 	{
 		"shiftjis", PG_SJIS
 	},							/* Shift_JIS; JIS X 0202-1991 */
@@ -314,7 +311,6 @@ const pg_enc2name pg_enc2name_tbl[] =
 	[PG_EUC_TW] = DEF_ENC2NAME(EUC_TW, 0),
 	[PG_EUC_JIS_2004] = DEF_ENC2NAME(EUC_JIS_2004, 20932),
 	[PG_UTF8] = DEF_ENC2NAME(UTF8, 65001),
-	[PG_MULE_INTERNAL] = DEF_ENC2NAME(MULE_INTERNAL, 0),
 	[PG_LATIN1] = DEF_ENC2NAME(LATIN1, 28591),
 	[PG_LATIN2] = DEF_ENC2NAME(LATIN2, 28592),
 	[PG_LATIN3] = DEF_ENC2NAME(LATIN3, 28593),
@@ -353,15 +349,12 @@ const pg_enc2name pg_enc2name_tbl[] =
 
 /* ----------
  * These are encoding names for gettext.
- *
- * This covers all encodings except MULE_INTERNAL, which is alien to gettext.
  * ----------
  */
 const char *pg_enc2gettext_tbl[] =
 {
 	[PG_SQL_ASCII] = "US-ASCII",
 	[PG_UTF8] = "UTF-8",
-	[PG_MULE_INTERNAL] = NULL,
 	[PG_LATIN1] = "LATIN1",
 	[PG_LATIN2] = "LATIN2",
 	[PG_LATIN3] = "LATIN3",
@@ -420,7 +413,6 @@ static const char *const pg_enc2icu_tbl[] =
 	[PG_EUC_TW] = "EUC-TW",
 	[PG_EUC_JIS_2004] = NULL,
 	[PG_UTF8] = "UTF-8",
-	[PG_MULE_INTERNAL] = NULL,
 	[PG_LATIN1] = "ISO-8859-1",
 	[PG_LATIN2] = "ISO-8859-2",
 	[PG_LATIN3] = "ISO-8859-3",
diff --git a/src/common/wchar.c b/src/common/wchar.c
index eb15ee59497..7fab5d262be 100644
--- a/src/common/wchar.c
+++ b/src/common/wchar.c
@@ -682,178 +682,6 @@ pg_utf_dsplen(const unsigned char *s)
 	return ucs_wcwidth(utf8_to_unicode(s));
 }
 
-/*
- * convert mule internal code to pg_wchar
- * caller should allocate enough space for "to"
- * len: length of from.
- * "from" not necessarily null terminated.
- */
-static int
-pg_mule2wchar_with_len(const unsigned char *from, pg_wchar *to, int len)
-{
-	int			cnt = 0;
-
-	while (len > 0 && *from)
-	{
-		if (IS_LC1(*from))
-		{
-			MB2CHAR_NEED_AT_LEAST(len, 2);
-			*to = *from++ << 16;
-			*to |= *from++;
-			len -= 2;
-		}
-		else if (IS_LCPRV1(*from))
-		{
-			MB2CHAR_NEED_AT_LEAST(len, 3);
-			from++;
-			*to = *from++ << 16;
-			*to |= *from++;
-			len -= 3;
-		}
-		else if (IS_LC2(*from))
-		{
-			MB2CHAR_NEED_AT_LEAST(len, 3);
-			*to = *from++ << 16;
-			*to |= *from++ << 8;
-			*to |= *from++;
-			len -= 3;
-		}
-		else if (IS_LCPRV2(*from))
-		{
-			MB2CHAR_NEED_AT_LEAST(len, 4);
-			from++;
-			*to = *from++ << 16;
-			*to |= *from++ << 8;
-			*to |= *from++;
-			len -= 4;
-		}
-		else
-		{						/* assume ASCII */
-			*to = (unsigned char) *from++;
-			len--;
-		}
-		to++;
-		cnt++;
-	}
-	*to = 0;
-	return cnt;
-}
-
-/*
- * convert pg_wchar to mule internal code
- * caller should allocate enough space for "to"
- * len: length of from.
- * "from" not necessarily null terminated.
- */
-static int
-pg_wchar2mule_with_len(const pg_wchar *from, unsigned char *to, int len)
-{
-	int			cnt = 0;
-
-	while (len > 0 && *from)
-	{
-		unsigned char lb;
-
-		lb = (*from >> 16) & 0xff;
-		if (IS_LC1(lb))
-		{
-			*to++ = lb;
-			*to++ = *from & 0xff;
-			cnt += 2;
-		}
-		else if (IS_LC2(lb))
-		{
-			*to++ = lb;
-			*to++ = (*from >> 8) & 0xff;
-			*to++ = *from & 0xff;
-			cnt += 3;
-		}
-		else if (IS_LCPRV1_A_RANGE(lb))
-		{
-			*to++ = LCPRV1_A;
-			*to++ = lb;
-			*to++ = *from & 0xff;
-			cnt += 3;
-		}
-		else if (IS_LCPRV1_B_RANGE(lb))
-		{
-			*to++ = LCPRV1_B;
-			*to++ = lb;
-			*to++ = *from & 0xff;
-			cnt += 3;
-		}
-		else if (IS_LCPRV2_A_RANGE(lb))
-		{
-			*to++ = LCPRV2_A;
-			*to++ = lb;
-			*to++ = (*from >> 8) & 0xff;
-			*to++ = *from & 0xff;
-			cnt += 4;
-		}
-		else if (IS_LCPRV2_B_RANGE(lb))
-		{
-			*to++ = LCPRV2_B;
-			*to++ = lb;
-			*to++ = (*from >> 8) & 0xff;
-			*to++ = *from & 0xff;
-			cnt += 4;
-		}
-		else
-		{
-			*to++ = *from & 0xff;
-			cnt += 1;
-		}
-		from++;
-		len--;
-	}
-	*to = 0;
-	return cnt;
-}
-
-/* exported for direct use by conv.c */
-int
-pg_mule_mblen(const unsigned char *s)
-{
-	int			len;
-
-	if (IS_LC1(*s))
-		len = 2;
-	else if (IS_LCPRV1(*s))
-		len = 3;
-	else if (IS_LC2(*s))
-		len = 3;
-	else if (IS_LCPRV2(*s))
-		len = 4;
-	else
-		len = 1;				/* assume ASCII */
-	return len;
-}
-
-static int
-pg_mule_dsplen(const unsigned char *s)
-{
-	int			len;
-
-	/*
-	 * Note: it's not really appropriate to assume that all multibyte charsets
-	 * are double-wide on screen.  But this seems an okay approximation for
-	 * the MULE charsets we currently support.
-	 */
-
-	if (IS_LC1(*s))
-		len = 1;
-	else if (IS_LCPRV1(*s))
-		len = 1;
-	else if (IS_LC2(*s))
-		len = 2;
-	else if (IS_LCPRV2(*s))
-		len = 2;
-	else
-		len = 1;				/* assume ASCII */
-
-	return len;
-}
-
 /*
  * ISO8859-1
  */
@@ -1378,56 +1206,6 @@ pg_johab_verifystr(const unsigned char *s, int len)
 	return s - start;
 }
 
-static int
-pg_mule_verifychar(const unsigned char *s, int len)
-{
-	int			l,
-				mbl;
-	unsigned char c;
-
-	l = mbl = pg_mule_mblen(s);
-
-	if (len < l)
-		return -1;
-
-	while (--l > 0)
-	{
-		c = *++s;
-		if (!IS_HIGHBIT_SET(c))
-			return -1;
-	}
-	return mbl;
-}
-
-static int
-pg_mule_verifystr(const unsigned char *s, int len)
-{
-	const unsigned char *start = s;
-
-	while (len > 0)
-	{
-		int			l;
-
-		/* fast path for ASCII-subset characters */
-		if (!IS_HIGHBIT_SET(*s))
-		{
-			if (*s == '\0')
-				break;
-			l = 1;
-		}
-		else
-		{
-			l = pg_mule_verifychar(s, len);
-			if (l == -1)
-				break;
-		}
-		s += l;
-		len -= l;
-	}
-
-	return s - start;
-}
-
 static int
 pg_latin1_verifychar(const unsigned char *s, int len)
 {
@@ -2091,7 +1869,6 @@ const pg_wchar_tbl pg_wchar_table[] = {
 	[PG_EUC_TW] = {pg_euctw2wchar_with_len, pg_wchar2euc_with_len, pg_euctw_mblen, pg_euctw_dsplen, pg_euctw_verifychar, pg_euctw_verifystr, 4},
 	[PG_EUC_JIS_2004] = {pg_eucjp2wchar_with_len, pg_wchar2euc_with_len, pg_eucjp_mblen, pg_eucjp_dsplen, pg_eucjp_verifychar, pg_eucjp_verifystr, 3},
 	[PG_UTF8] = {pg_utf2wchar_with_len, pg_wchar2utf_with_len, pg_utf_mblen, pg_utf_dsplen, pg_utf8_verifychar, pg_utf8_verifystr, 4},
-	[PG_MULE_INTERNAL] = {pg_mule2wchar_with_len, pg_wchar2mule_with_len, pg_mule_mblen, pg_mule_dsplen, pg_mule_verifychar, pg_mule_verifystr, 4},
 	[PG_LATIN1] = {pg_latin12wchar_with_len, pg_wchar2single_with_len, pg_latin1_mblen, pg_latin1_dsplen, pg_latin1_verifychar, pg_latin1_verifystr, 1},
 	[PG_LATIN2] = {pg_latin12wchar_with_len, pg_wchar2single_with_len, pg_latin1_mblen, pg_latin1_dsplen, pg_latin1_verifychar, pg_latin1_verifystr, 1},
 	[PG_LATIN3] = {pg_latin12wchar_with_len, pg_wchar2single_with_len, pg_latin1_mblen, pg_latin1_dsplen, pg_latin1_verifychar, pg_latin1_verifystr, 1},
diff --git a/src/include/catalog/pg_conversion.dat b/src/include/catalog/pg_conversion.dat
index 68beb100a40..4243c8006a7 100644
--- a/src/include/catalog/pg_conversion.dat
+++ b/src/include/catalog/pg_conversion.dat
@@ -15,30 +15,6 @@
 
 [
 
-{ oid => '4402', descr => 'conversion for KOI8R to MULE_INTERNAL',
-  conname => 'koi8_r_to_mic', conforencoding => 'PG_KOI8R',
-  contoencoding => 'PG_MULE_INTERNAL', conproc => 'koi8r_to_mic' },
-{ oid => '4403', descr => 'conversion for MULE_INTERNAL to KOI8R',
-  conname => 'mic_to_koi8_r', conforencoding => 'PG_MULE_INTERNAL',
-  contoencoding => 'PG_KOI8R', conproc => 'mic_to_koi8r' },
-{ oid => '4404', descr => 'conversion for ISO-8859-5 to MULE_INTERNAL',
-  conname => 'iso_8859_5_to_mic', conforencoding => 'PG_ISO_8859_5',
-  contoencoding => 'PG_MULE_INTERNAL', conproc => 'iso_to_mic' },
-{ oid => '4405', descr => 'conversion for MULE_INTERNAL to ISO-8859-5',
-  conname => 'mic_to_iso_8859_5', conforencoding => 'PG_MULE_INTERNAL',
-  contoencoding => 'PG_ISO_8859_5', conproc => 'mic_to_iso' },
-{ oid => '4406', descr => 'conversion for WIN1251 to MULE_INTERNAL',
-  conname => 'windows_1251_to_mic', conforencoding => 'PG_WIN1251',
-  contoencoding => 'PG_MULE_INTERNAL', conproc => 'win1251_to_mic' },
-{ oid => '4407', descr => 'conversion for MULE_INTERNAL to WIN1251',
-  conname => 'mic_to_windows_1251', conforencoding => 'PG_MULE_INTERNAL',
-  contoencoding => 'PG_WIN1251', conproc => 'mic_to_win1251' },
-{ oid => '4408', descr => 'conversion for WIN866 to MULE_INTERNAL',
-  conname => 'windows_866_to_mic', conforencoding => 'PG_WIN866',
-  contoencoding => 'PG_MULE_INTERNAL', conproc => 'win866_to_mic' },
-{ oid => '4409', descr => 'conversion for MULE_INTERNAL to WIN866',
-  conname => 'mic_to_windows_866', conforencoding => 'PG_MULE_INTERNAL',
-  contoencoding => 'PG_WIN866', conproc => 'mic_to_win866' },
 { oid => '4410', descr => 'conversion for KOI8R to WIN1251',
   conname => 'koi8_r_to_windows_1251', conforencoding => 'PG_KOI8R',
   contoencoding => 'PG_WIN1251', conproc => 'koi8r_to_win1251' },
@@ -75,90 +51,24 @@
 { oid => '4421', descr => 'conversion for WIN866 to ISO-8859-5',
   conname => 'windows_866_to_iso_8859_5', conforencoding => 'PG_WIN866',
   contoencoding => 'PG_ISO_8859_5', conproc => 'win866_to_iso' },
-{ oid => '4422', descr => 'conversion for EUC_CN to MULE_INTERNAL',
-  conname => 'euc_cn_to_mic', conforencoding => 'PG_EUC_CN',
-  contoencoding => 'PG_MULE_INTERNAL', conproc => 'euc_cn_to_mic' },
-{ oid => '4423', descr => 'conversion for MULE_INTERNAL to EUC_CN',
-  conname => 'mic_to_euc_cn', conforencoding => 'PG_MULE_INTERNAL',
-  contoencoding => 'PG_EUC_CN', conproc => 'mic_to_euc_cn' },
 { oid => '4424', descr => 'conversion for EUC_JP to SJIS',
   conname => 'euc_jp_to_sjis', conforencoding => 'PG_EUC_JP',
   contoencoding => 'PG_SJIS', conproc => 'euc_jp_to_sjis' },
 { oid => '4425', descr => 'conversion for SJIS to EUC_JP',
   conname => 'sjis_to_euc_jp', conforencoding => 'PG_SJIS',
   contoencoding => 'PG_EUC_JP', conproc => 'sjis_to_euc_jp' },
-{ oid => '4426', descr => 'conversion for EUC_JP to MULE_INTERNAL',
-  conname => 'euc_jp_to_mic', conforencoding => 'PG_EUC_JP',
-  contoencoding => 'PG_MULE_INTERNAL', conproc => 'euc_jp_to_mic' },
-{ oid => '4427', descr => 'conversion for SJIS to MULE_INTERNAL',
-  conname => 'sjis_to_mic', conforencoding => 'PG_SJIS',
-  contoencoding => 'PG_MULE_INTERNAL', conproc => 'sjis_to_mic' },
-{ oid => '4428', descr => 'conversion for MULE_INTERNAL to EUC_JP',
-  conname => 'mic_to_euc_jp', conforencoding => 'PG_MULE_INTERNAL',
-  contoencoding => 'PG_EUC_JP', conproc => 'mic_to_euc_jp' },
-{ oid => '4429', descr => 'conversion for MULE_INTERNAL to SJIS',
-  conname => 'mic_to_sjis', conforencoding => 'PG_MULE_INTERNAL',
-  contoencoding => 'PG_SJIS', conproc => 'mic_to_sjis' },
-{ oid => '4430', descr => 'conversion for EUC_KR to MULE_INTERNAL',
-  conname => 'euc_kr_to_mic', conforencoding => 'PG_EUC_KR',
-  contoencoding => 'PG_MULE_INTERNAL', conproc => 'euc_kr_to_mic' },
-{ oid => '4431', descr => 'conversion for MULE_INTERNAL to EUC_KR',
-  conname => 'mic_to_euc_kr', conforencoding => 'PG_MULE_INTERNAL',
-  contoencoding => 'PG_EUC_KR', conproc => 'mic_to_euc_kr' },
 { oid => '4432', descr => 'conversion for EUC_TW to BIG5',
   conname => 'euc_tw_to_big5', conforencoding => 'PG_EUC_TW',
   contoencoding => 'PG_BIG5', conproc => 'euc_tw_to_big5' },
 { oid => '4433', descr => 'conversion for BIG5 to EUC_TW',
   conname => 'big5_to_euc_tw', conforencoding => 'PG_BIG5',
   contoencoding => 'PG_EUC_TW', conproc => 'big5_to_euc_tw' },
-{ oid => '4434', descr => 'conversion for EUC_TW to MULE_INTERNAL',
-  conname => 'euc_tw_to_mic', conforencoding => 'PG_EUC_TW',
-  contoencoding => 'PG_MULE_INTERNAL', conproc => 'euc_tw_to_mic' },
-{ oid => '4435', descr => 'conversion for BIG5 to MULE_INTERNAL',
-  conname => 'big5_to_mic', conforencoding => 'PG_BIG5',
-  contoencoding => 'PG_MULE_INTERNAL', conproc => 'big5_to_mic' },
-{ oid => '4436', descr => 'conversion for MULE_INTERNAL to EUC_TW',
-  conname => 'mic_to_euc_tw', conforencoding => 'PG_MULE_INTERNAL',
-  contoencoding => 'PG_EUC_TW', conproc => 'mic_to_euc_tw' },
-{ oid => '4437', descr => 'conversion for MULE_INTERNAL to BIG5',
-  conname => 'mic_to_big5', conforencoding => 'PG_MULE_INTERNAL',
-  contoencoding => 'PG_BIG5', conproc => 'mic_to_big5' },
-{ oid => '4438', descr => 'conversion for LATIN2 to MULE_INTERNAL',
-  conname => 'iso_8859_2_to_mic', conforencoding => 'PG_LATIN2',
-  contoencoding => 'PG_MULE_INTERNAL', conproc => 'latin2_to_mic' },
-{ oid => '4439', descr => 'conversion for MULE_INTERNAL to LATIN2',
-  conname => 'mic_to_iso_8859_2', conforencoding => 'PG_MULE_INTERNAL',
-  contoencoding => 'PG_LATIN2', conproc => 'mic_to_latin2' },
-{ oid => '4440', descr => 'conversion for WIN1250 to MULE_INTERNAL',
-  conname => 'windows_1250_to_mic', conforencoding => 'PG_WIN1250',
-  contoencoding => 'PG_MULE_INTERNAL', conproc => 'win1250_to_mic' },
-{ oid => '4441', descr => 'conversion for MULE_INTERNAL to WIN1250',
-  conname => 'mic_to_windows_1250', conforencoding => 'PG_MULE_INTERNAL',
-  contoencoding => 'PG_WIN1250', conproc => 'mic_to_win1250' },
 { oid => '4442', descr => 'conversion for LATIN2 to WIN1250',
   conname => 'iso_8859_2_to_windows_1250', conforencoding => 'PG_LATIN2',
   contoencoding => 'PG_WIN1250', conproc => 'latin2_to_win1250' },
 { oid => '4443', descr => 'conversion for WIN1250 to LATIN2',
   conname => 'windows_1250_to_iso_8859_2', conforencoding => 'PG_WIN1250',
   contoencoding => 'PG_LATIN2', conproc => 'win1250_to_latin2' },
-{ oid => '4444', descr => 'conversion for LATIN1 to MULE_INTERNAL',
-  conname => 'iso_8859_1_to_mic', conforencoding => 'PG_LATIN1',
-  contoencoding => 'PG_MULE_INTERNAL', conproc => 'latin1_to_mic' },
-{ oid => '4445', descr => 'conversion for MULE_INTERNAL to LATIN1',
-  conname => 'mic_to_iso_8859_1', conforencoding => 'PG_MULE_INTERNAL',
-  contoencoding => 'PG_LATIN1', conproc => 'mic_to_latin1' },
-{ oid => '4446', descr => 'conversion for LATIN3 to MULE_INTERNAL',
-  conname => 'iso_8859_3_to_mic', conforencoding => 'PG_LATIN3',
-  contoencoding => 'PG_MULE_INTERNAL', conproc => 'latin3_to_mic' },
-{ oid => '4447', descr => 'conversion for MULE_INTERNAL to LATIN3',
-  conname => 'mic_to_iso_8859_3', conforencoding => 'PG_MULE_INTERNAL',
-  contoencoding => 'PG_LATIN3', conproc => 'mic_to_latin3' },
-{ oid => '4448', descr => 'conversion for LATIN4 to MULE_INTERNAL',
-  conname => 'iso_8859_4_to_mic', conforencoding => 'PG_LATIN4',
-  contoencoding => 'PG_MULE_INTERNAL', conproc => 'latin4_to_mic' },
-{ oid => '4449', descr => 'conversion for MULE_INTERNAL to LATIN4',
-  conname => 'mic_to_iso_8859_4', conforencoding => 'PG_MULE_INTERNAL',
-  contoencoding => 'PG_LATIN4', conproc => 'mic_to_latin4' },
 { oid => '4452', descr => 'conversion for BIG5 to UTF8',
   conname => 'big5_to_utf8', conforencoding => 'PG_BIG5',
   contoencoding => 'PG_UTF8', conproc => 'big5_to_utf8' },
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index 83f6501df38..30f05e4730d 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -11851,112 +11851,62 @@
   proargtypes => '', prosrc => 'binary_upgrade_create_conflict_detection_slot' },
 
 # conversion functions
-{ oid => '4302',
-  descr => 'internal conversion function for KOI8R to MULE_INTERNAL',
-  proname => 'koi8r_to_mic', prolang => 'c', prorettype => 'int4',
-  proargtypes => 'int4 int4 cstring internal int4 bool',
-  prosrc => 'koi8r_to_mic', probin => '$libdir/cyrillic_and_mic' },
-{ oid => '4303',
-  descr => 'internal conversion function for MULE_INTERNAL to KOI8R',
-  proname => 'mic_to_koi8r', prolang => 'c', prorettype => 'int4',
-  proargtypes => 'int4 int4 cstring internal int4 bool',
-  prosrc => 'mic_to_koi8r', probin => '$libdir/cyrillic_and_mic' },
-{ oid => '4304',
-  descr => 'internal conversion function for ISO-8859-5 to MULE_INTERNAL',
-  proname => 'iso_to_mic', prolang => 'c', prorettype => 'int4',
-  proargtypes => 'int4 int4 cstring internal int4 bool', prosrc => 'iso_to_mic',
-  probin => '$libdir/cyrillic_and_mic' },
-{ oid => '4305',
-  descr => 'internal conversion function for MULE_INTERNAL to ISO-8859-5',
-  proname => 'mic_to_iso', prolang => 'c', prorettype => 'int4',
-  proargtypes => 'int4 int4 cstring internal int4 bool', prosrc => 'mic_to_iso',
-  probin => '$libdir/cyrillic_and_mic' },
-{ oid => '4306',
-  descr => 'internal conversion function for WIN1251 to MULE_INTERNAL',
-  proname => 'win1251_to_mic', prolang => 'c', prorettype => 'int4',
-  proargtypes => 'int4 int4 cstring internal int4 bool',
-  prosrc => 'win1251_to_mic', probin => '$libdir/cyrillic_and_mic' },
-{ oid => '4307',
-  descr => 'internal conversion function for MULE_INTERNAL to WIN1251',
-  proname => 'mic_to_win1251', prolang => 'c', prorettype => 'int4',
-  proargtypes => 'int4 int4 cstring internal int4 bool',
-  prosrc => 'mic_to_win1251', probin => '$libdir/cyrillic_and_mic' },
-{ oid => '4308',
-  descr => 'internal conversion function for WIN866 to MULE_INTERNAL',
-  proname => 'win866_to_mic', prolang => 'c', prorettype => 'int4',
-  proargtypes => 'int4 int4 cstring internal int4 bool',
-  prosrc => 'win866_to_mic', probin => '$libdir/cyrillic_and_mic' },
-{ oid => '4309',
-  descr => 'internal conversion function for MULE_INTERNAL to WIN866',
-  proname => 'mic_to_win866', prolang => 'c', prorettype => 'int4',
-  proargtypes => 'int4 int4 cstring internal int4 bool',
-  prosrc => 'mic_to_win866', probin => '$libdir/cyrillic_and_mic' },
 { oid => '4310', descr => 'internal conversion function for KOI8R to WIN1251',
   proname => 'koi8r_to_win1251', prolang => 'c', prorettype => 'int4',
   proargtypes => 'int4 int4 cstring internal int4 bool',
-  prosrc => 'koi8r_to_win1251', probin => '$libdir/cyrillic_and_mic' },
+  prosrc => 'koi8r_to_win1251', probin => '$libdir/cyrillic' },
 { oid => '4311', descr => 'internal conversion function for WIN1251 to KOI8R',
   proname => 'win1251_to_koi8r', prolang => 'c', prorettype => 'int4',
   proargtypes => 'int4 int4 cstring internal int4 bool',
-  prosrc => 'win1251_to_koi8r', probin => '$libdir/cyrillic_and_mic' },
+  prosrc => 'win1251_to_koi8r', probin => '$libdir/cyrillic' },
 { oid => '4312', descr => 'internal conversion function for KOI8R to WIN866',
   proname => 'koi8r_to_win866', prolang => 'c', prorettype => 'int4',
   proargtypes => 'int4 int4 cstring internal int4 bool',
-  prosrc => 'koi8r_to_win866', probin => '$libdir/cyrillic_and_mic' },
+  prosrc => 'koi8r_to_win866', probin => '$libdir/cyrillic' },
 { oid => '4313', descr => 'internal conversion function for WIN866 to KOI8R',
   proname => 'win866_to_koi8r', prolang => 'c', prorettype => 'int4',
   proargtypes => 'int4 int4 cstring internal int4 bool',
-  prosrc => 'win866_to_koi8r', probin => '$libdir/cyrillic_and_mic' },
+  prosrc => 'win866_to_koi8r', probin => '$libdir/cyrillic' },
 { oid => '4314',
   descr => 'internal conversion function for WIN866 to WIN1251',
   proname => 'win866_to_win1251', prolang => 'c', prorettype => 'int4',
   proargtypes => 'int4 int4 cstring internal int4 bool',
-  prosrc => 'win866_to_win1251', probin => '$libdir/cyrillic_and_mic' },
+  prosrc => 'win866_to_win1251', probin => '$libdir/cyrillic' },
 { oid => '4315',
   descr => 'internal conversion function for WIN1251 to WIN866',
   proname => 'win1251_to_win866', prolang => 'c', prorettype => 'int4',
   proargtypes => 'int4 int4 cstring internal int4 bool',
-  prosrc => 'win1251_to_win866', probin => '$libdir/cyrillic_and_mic' },
+  prosrc => 'win1251_to_win866', probin => '$libdir/cyrillic' },
 { oid => '4316',
   descr => 'internal conversion function for ISO-8859-5 to KOI8R',
   proname => 'iso_to_koi8r', prolang => 'c', prorettype => 'int4',
   proargtypes => 'int4 int4 cstring internal int4 bool',
-  prosrc => 'iso_to_koi8r', probin => '$libdir/cyrillic_and_mic' },
+  prosrc => 'iso_to_koi8r', probin => '$libdir/cyrillic' },
 { oid => '4317',
   descr => 'internal conversion function for KOI8R to ISO-8859-5',
   proname => 'koi8r_to_iso', prolang => 'c', prorettype => 'int4',
   proargtypes => 'int4 int4 cstring internal int4 bool',
-  prosrc => 'koi8r_to_iso', probin => '$libdir/cyrillic_and_mic' },
+  prosrc => 'koi8r_to_iso', probin => '$libdir/cyrillic' },
 { oid => '4318',
   descr => 'internal conversion function for ISO-8859-5 to WIN1251',
   proname => 'iso_to_win1251', prolang => 'c', prorettype => 'int4',
   proargtypes => 'int4 int4 cstring internal int4 bool',
-  prosrc => 'iso_to_win1251', probin => '$libdir/cyrillic_and_mic' },
+  prosrc => 'iso_to_win1251', probin => '$libdir/cyrillic' },
 { oid => '4319',
   descr => 'internal conversion function for WIN1251 to ISO-8859-5',
   proname => 'win1251_to_iso', prolang => 'c', prorettype => 'int4',
   proargtypes => 'int4 int4 cstring internal int4 bool',
-  prosrc => 'win1251_to_iso', probin => '$libdir/cyrillic_and_mic' },
+  prosrc => 'win1251_to_iso', probin => '$libdir/cyrillic' },
 { oid => '4320',
   descr => 'internal conversion function for ISO-8859-5 to WIN866',
   proname => 'iso_to_win866', prolang => 'c', prorettype => 'int4',
   proargtypes => 'int4 int4 cstring internal int4 bool',
-  prosrc => 'iso_to_win866', probin => '$libdir/cyrillic_and_mic' },
+  prosrc => 'iso_to_win866', probin => '$libdir/cyrillic' },
 { oid => '4321',
   descr => 'internal conversion function for WIN866 to ISO-8859-5',
   proname => 'win866_to_iso', prolang => 'c', prorettype => 'int4',
   proargtypes => 'int4 int4 cstring internal int4 bool',
-  prosrc => 'win866_to_iso', probin => '$libdir/cyrillic_and_mic' },
-{ oid => '4322',
-  descr => 'internal conversion function for EUC_CN to MULE_INTERNAL',
-  proname => 'euc_cn_to_mic', prolang => 'c', prorettype => 'int4',
-  proargtypes => 'int4 int4 cstring internal int4 bool',
-  prosrc => 'euc_cn_to_mic', probin => '$libdir/euc_cn_and_mic' },
-{ oid => '4323',
-  descr => 'internal conversion function for MULE_INTERNAL to EUC_CN',
-  proname => 'mic_to_euc_cn', prolang => 'c', prorettype => 'int4',
-  proargtypes => 'int4 int4 cstring internal int4 bool',
-  prosrc => 'mic_to_euc_cn', probin => '$libdir/euc_cn_and_mic' },
+  prosrc => 'win866_to_iso', probin => '$libdir/cyrillic' },
 { oid => '4324', descr => 'internal conversion function for EUC_JP to SJIS',
   proname => 'euc_jp_to_sjis', prolang => 'c', prorettype => 'int4',
   proargtypes => 'int4 int4 cstring internal int4 bool',
@@ -11965,36 +11915,6 @@
   proname => 'sjis_to_euc_jp', prolang => 'c', prorettype => 'int4',
   proargtypes => 'int4 int4 cstring internal int4 bool',
   prosrc => 'sjis_to_euc_jp', probin => '$libdir/euc_jp_and_sjis' },
-{ oid => '4326',
-  descr => 'internal conversion function for EUC_JP to MULE_INTERNAL',
-  proname => 'euc_jp_to_mic', prolang => 'c', prorettype => 'int4',
-  proargtypes => 'int4 int4 cstring internal int4 bool',
-  prosrc => 'euc_jp_to_mic', probin => '$libdir/euc_jp_and_sjis' },
-{ oid => '4327',
-  descr => 'internal conversion function for SJIS to MULE_INTERNAL',
-  proname => 'sjis_to_mic', prolang => 'c', prorettype => 'int4',
-  proargtypes => 'int4 int4 cstring internal int4 bool',
-  prosrc => 'sjis_to_mic', probin => '$libdir/euc_jp_and_sjis' },
-{ oid => '4328',
-  descr => 'internal conversion function for MULE_INTERNAL to EUC_JP',
-  proname => 'mic_to_euc_jp', prolang => 'c', prorettype => 'int4',
-  proargtypes => 'int4 int4 cstring internal int4 bool',
-  prosrc => 'mic_to_euc_jp', probin => '$libdir/euc_jp_and_sjis' },
-{ oid => '4329',
-  descr => 'internal conversion function for MULE_INTERNAL to SJIS',
-  proname => 'mic_to_sjis', prolang => 'c', prorettype => 'int4',
-  proargtypes => 'int4 int4 cstring internal int4 bool',
-  prosrc => 'mic_to_sjis', probin => '$libdir/euc_jp_and_sjis' },
-{ oid => '4330',
-  descr => 'internal conversion function for EUC_KR to MULE_INTERNAL',
-  proname => 'euc_kr_to_mic', prolang => 'c', prorettype => 'int4',
-  proargtypes => 'int4 int4 cstring internal int4 bool',
-  prosrc => 'euc_kr_to_mic', probin => '$libdir/euc_kr_and_mic' },
-{ oid => '4331',
-  descr => 'internal conversion function for MULE_INTERNAL to EUC_KR',
-  proname => 'mic_to_euc_kr', prolang => 'c', prorettype => 'int4',
-  proargtypes => 'int4 int4 cstring internal int4 bool',
-  prosrc => 'mic_to_euc_kr', probin => '$libdir/euc_kr_and_mic' },
 { oid => '4332', descr => 'internal conversion function for EUC_TW to BIG5',
   proname => 'euc_tw_to_big5', prolang => 'c', prorettype => 'int4',
   proargtypes => 'int4 int4 cstring internal int4 bool',
@@ -12003,46 +11923,6 @@
   proname => 'big5_to_euc_tw', prolang => 'c', prorettype => 'int4',
   proargtypes => 'int4 int4 cstring internal int4 bool',
   prosrc => 'big5_to_euc_tw', probin => '$libdir/euc_tw_and_big5' },
-{ oid => '4334',
-  descr => 'internal conversion function for EUC_TW to MULE_INTERNAL',
-  proname => 'euc_tw_to_mic', prolang => 'c', prorettype => 'int4',
-  proargtypes => 'int4 int4 cstring internal int4 bool',
-  prosrc => 'euc_tw_to_mic', probin => '$libdir/euc_tw_and_big5' },
-{ oid => '4335',
-  descr => 'internal conversion function for BIG5 to MULE_INTERNAL',
-  proname => 'big5_to_mic', prolang => 'c', prorettype => 'int4',
-  proargtypes => 'int4 int4 cstring internal int4 bool',
-  prosrc => 'big5_to_mic', probin => '$libdir/euc_tw_and_big5' },
-{ oid => '4336',
-  descr => 'internal conversion function for MULE_INTERNAL to EUC_TW',
-  proname => 'mic_to_euc_tw', prolang => 'c', prorettype => 'int4',
-  proargtypes => 'int4 int4 cstring internal int4 bool',
-  prosrc => 'mic_to_euc_tw', probin => '$libdir/euc_tw_and_big5' },
-{ oid => '4337',
-  descr => 'internal conversion function for MULE_INTERNAL to BIG5',
-  proname => 'mic_to_big5', prolang => 'c', prorettype => 'int4',
-  proargtypes => 'int4 int4 cstring internal int4 bool',
-  prosrc => 'mic_to_big5', probin => '$libdir/euc_tw_and_big5' },
-{ oid => '4338',
-  descr => 'internal conversion function for LATIN2 to MULE_INTERNAL',
-  proname => 'latin2_to_mic', prolang => 'c', prorettype => 'int4',
-  proargtypes => 'int4 int4 cstring internal int4 bool',
-  prosrc => 'latin2_to_mic', probin => '$libdir/latin2_and_win1250' },
-{ oid => '4339',
-  descr => 'internal conversion function for MULE_INTERNAL to LATIN2',
-  proname => 'mic_to_latin2', prolang => 'c', prorettype => 'int4',
-  proargtypes => 'int4 int4 cstring internal int4 bool',
-  prosrc => 'mic_to_latin2', probin => '$libdir/latin2_and_win1250' },
-{ oid => '4340',
-  descr => 'internal conversion function for WIN1250 to MULE_INTERNAL',
-  proname => 'win1250_to_mic', prolang => 'c', prorettype => 'int4',
-  proargtypes => 'int4 int4 cstring internal int4 bool',
-  prosrc => 'win1250_to_mic', probin => '$libdir/latin2_and_win1250' },
-{ oid => '4341',
-  descr => 'internal conversion function for MULE_INTERNAL to WIN1250',
-  proname => 'mic_to_win1250', prolang => 'c', prorettype => 'int4',
-  proargtypes => 'int4 int4 cstring internal int4 bool',
-  prosrc => 'mic_to_win1250', probin => '$libdir/latin2_and_win1250' },
 { oid => '4342',
   descr => 'internal conversion function for LATIN2 to WIN1250',
   proname => 'latin2_to_win1250', prolang => 'c', prorettype => 'int4',
@@ -12053,36 +11933,6 @@
   proname => 'win1250_to_latin2', prolang => 'c', prorettype => 'int4',
   proargtypes => 'int4 int4 cstring internal int4 bool',
   prosrc => 'win1250_to_latin2', probin => '$libdir/latin2_and_win1250' },
-{ oid => '4344',
-  descr => 'internal conversion function for LATIN1 to MULE_INTERNAL',
-  proname => 'latin1_to_mic', prolang => 'c', prorettype => 'int4',
-  proargtypes => 'int4 int4 cstring internal int4 bool',
-  prosrc => 'latin1_to_mic', probin => '$libdir/latin_and_mic' },
-{ oid => '4345',
-  descr => 'internal conversion function for MULE_INTERNAL to LATIN1',
-  proname => 'mic_to_latin1', prolang => 'c', prorettype => 'int4',
-  proargtypes => 'int4 int4 cstring internal int4 bool',
-  prosrc => 'mic_to_latin1', probin => '$libdir/latin_and_mic' },
-{ oid => '4346',
-  descr => 'internal conversion function for LATIN3 to MULE_INTERNAL',
-  proname => 'latin3_to_mic', prolang => 'c', prorettype => 'int4',
-  proargtypes => 'int4 int4 cstring internal int4 bool',
-  prosrc => 'latin3_to_mic', probin => '$libdir/latin_and_mic' },
-{ oid => '4347',
-  descr => 'internal conversion function for MULE_INTERNAL to LATIN3',
-  proname => 'mic_to_latin3', prolang => 'c', prorettype => 'int4',
-  proargtypes => 'int4 int4 cstring internal int4 bool',
-  prosrc => 'mic_to_latin3', probin => '$libdir/latin_and_mic' },
-{ oid => '4348',
-  descr => 'internal conversion function for LATIN4 to MULE_INTERNAL',
-  proname => 'latin4_to_mic', prolang => 'c', prorettype => 'int4',
-  proargtypes => 'int4 int4 cstring internal int4 bool',
-  prosrc => 'latin4_to_mic', probin => '$libdir/latin_and_mic' },
-{ oid => '4349',
-  descr => 'internal conversion function for MULE_INTERNAL to LATIN4',
-  proname => 'mic_to_latin4', prolang => 'c', prorettype => 'int4',
-  proargtypes => 'int4 int4 cstring internal int4 bool',
-  prosrc => 'mic_to_latin4', probin => '$libdir/latin_and_mic' },
 { oid => '4352', descr => 'internal conversion function for BIG5 to UTF8',
   proname => 'big5_to_utf8', prolang => 'c', prorettype => 'int4',
   proargtypes => 'int4 int4 cstring internal int4 bool',
diff --git a/src/include/mb/pg_wchar.h b/src/include/mb/pg_wchar.h
index e1655fe61d6..deee2a832c3 100644
--- a/src/include/mb/pg_wchar.h
+++ b/src/include/mb/pg_wchar.h
@@ -39,187 +39,21 @@ typedef unsigned int pg_wchar;
 #define SS3 0x8f				/* single shift 3 (JIS0212) */
 
 /*
- * SJIS validation macros
+ * EUC_TW planes
  */
-#define ISSJISHEAD(c) (((c) >= 0x81 && (c) <= 0x9f) || ((c) >= 0xe0 && (c) <= 0xfc))
-#define ISSJISTAIL(c) (((c) >= 0x40 && (c) <= 0x7e) || ((c) >= 0x80 && (c) <= 0xfc))
-
-/*----------------------------------------------------
- * MULE Internal Encoding (MIC)
- *
- * This encoding follows the design used within XEmacs; it is meant to
- * subsume many externally-defined character sets.  Each character includes
- * identification of the character set it belongs to, so the encoding is
- * general but somewhat bulky.
- *
- * Currently PostgreSQL supports 5 types of MULE character sets:
- *
- * 1) 1-byte ASCII characters.  Each byte is below 0x80.
- *
- * 2) "Official" single byte charsets such as ISO-8859-1 (Latin1).
- *	  Each MULE character consists of 2 bytes: LC1 + C1, where LC1 is
- *	  an identifier for the charset (in the range 0x81 to 0x8d) and C1
- *	  is the character code (in the range 0xa0 to 0xff).
- *
- * 3) "Private" single byte charsets such as SISHENG.  Each MULE
- *	  character consists of 3 bytes: LCPRV1 + LC12 + C1, where LCPRV1
- *	  is a private-charset flag, LC12 is an identifier for the charset,
- *	  and C1 is the character code (in the range 0xa0 to 0xff).
- *	  LCPRV1 is either 0x9a (if LC12 is in the range 0xa0 to 0xdf)
- *	  or 0x9b (if LC12 is in the range 0xe0 to 0xef).
- *
- * 4) "Official" multibyte charsets such as JIS X0208.  Each MULE
- *	  character consists of 3 bytes: LC2 + C1 + C2, where LC2 is
- *	  an identifier for the charset (in the range 0x90 to 0x99) and C1
- *	  and C2 form the character code (each in the range 0xa0 to 0xff).
- *
- * 5) "Private" multibyte charsets such as CNS 11643-1992 Plane 3.
- *	  Each MULE character consists of 4 bytes: LCPRV2 + LC22 + C1 + C2,
- *	  where LCPRV2 is a private-charset flag, LC22 is an identifier for
- *	  the charset, and C1 and C2 form the character code (each in the range
- *	  0xa0 to 0xff).  LCPRV2 is either 0x9c (if LC22 is in the range 0xf0
- *	  to 0xf4) or 0x9d (if LC22 is in the range 0xf5 to 0xfe).
- *
- * "Official" encodings are those that have been assigned code numbers by
- * the XEmacs project; "private" encodings have Postgres-specific charset
- * identifiers.
- *
- * See the "XEmacs Internals Manual", available at http://www.xemacs.org,
- * for more details.  Note that for historical reasons, Postgres'
- * private-charset flag values do not match what XEmacs says they should be,
- * so this isn't really exactly MULE (not that private charsets would be
- * interoperable anyway).
- *
- * Note that XEmacs's implementation is different from what emacs does.
- * We follow emacs's implementation, rather than XEmacs's.
- *----------------------------------------------------
- */
-
-/*
- * Charset identifiers (also called "leading bytes" in the MULE documentation)
- */
-
-/*
- * Charset IDs for official single byte encodings (0x81-0x8e)
- */
-#define LC_ISO8859_1		0x81	/* ISO8859 Latin 1 */
-#define LC_ISO8859_2		0x82	/* ISO8859 Latin 2 */
-#define LC_ISO8859_3		0x83	/* ISO8859 Latin 3 */
-#define LC_ISO8859_4		0x84	/* ISO8859 Latin 4 */
-#define LC_TIS620			0x85	/* Thai (not supported yet) */
-#define LC_ISO8859_7		0x86	/* Greek (not supported yet) */
-#define LC_ISO8859_6		0x87	/* Arabic (not supported yet) */
-#define LC_ISO8859_8		0x88	/* Hebrew (not supported yet) */
-#define LC_JISX0201K		0x89	/* Japanese 1 byte kana */
-#define LC_JISX0201R		0x8a	/* Japanese 1 byte Roman */
-/* Note that 0x8b seems to be unused as of Emacs 20.7.
- * However, there might be a chance that 0x8b could be used
- * in later versions of Emacs.
- */
-#define LC_KOI8_R			0x8b	/* Cyrillic KOI8-R */
-#define LC_ISO8859_5		0x8c	/* ISO8859 Cyrillic */
-#define LC_ISO8859_9		0x8d	/* ISO8859 Latin 5 (not supported yet) */
-#define LC_ISO8859_15		0x8e	/* ISO8859 Latin 15 (not supported yet) */
-/* #define CONTROL_1		0x8f	control characters (unused) */
-
-/* Is a leading byte for "official" single byte encodings? */
-#define IS_LC1(c)	((unsigned char)(c) >= 0x81 && (unsigned char)(c) <= 0x8d)
-
-/*
- * Charset IDs for official multibyte encodings (0x90-0x99)
- * 0x9a-0x9d are free. 0x9e and 0x9f are reserved.
- */
-#define LC_JISX0208_1978	0x90	/* Japanese Kanji, old JIS (not supported) */
-#define LC_GB2312_80		0x91	/* Chinese */
-#define LC_JISX0208			0x92	/* Japanese Kanji (JIS X 0208) */
-#define LC_KS5601			0x93	/* Korean */
-#define LC_JISX0212			0x94	/* Japanese Kanji (JIS X 0212) */
 #define LC_CNS11643_1		0x95	/* CNS 11643-1992 Plane 1 */
 #define LC_CNS11643_2		0x96	/* CNS 11643-1992 Plane 2 */
-#define LC_JISX0213_1		0x97	/* Japanese Kanji (JIS X 0213 Plane 1)
-									 * (not supported) */
-#define LC_BIG5_1			0x98	/* Plane 1 Chinese traditional (not
-									 * supported) */
-#define LC_BIG5_2			0x99	/* Plane 1 Chinese traditional (not
-									 * supported) */
-
-/* Is a leading byte for "official" multibyte encodings? */
-#define IS_LC2(c)	((unsigned char)(c) >= 0x90 && (unsigned char)(c) <= 0x99)
-
-/*
- * Postgres-specific prefix bytes for "private" single byte encodings
- * (According to the MULE docs, we should be using 0x9e for this)
- */
-#define LCPRV1_A		0x9a
-#define LCPRV1_B		0x9b
-#define IS_LCPRV1(c)	((unsigned char)(c) == LCPRV1_A || (unsigned char)(c) == LCPRV1_B)
-#define IS_LCPRV1_A_RANGE(c)	\
-	((unsigned char)(c) >= 0xa0 && (unsigned char)(c) <= 0xdf)
-#define IS_LCPRV1_B_RANGE(c)	\
-	((unsigned char)(c) >= 0xe0 && (unsigned char)(c) <= 0xef)
-
-/*
- * Postgres-specific prefix bytes for "private" multibyte encodings
- * (According to the MULE docs, we should be using 0x9f for this)
- */
-#define LCPRV2_A		0x9c
-#define LCPRV2_B		0x9d
-#define IS_LCPRV2(c)	((unsigned char)(c) == LCPRV2_A || (unsigned char)(c) == LCPRV2_B)
-#define IS_LCPRV2_A_RANGE(c)	\
-	((unsigned char)(c) >= 0xf0 && (unsigned char)(c) <= 0xf4)
-#define IS_LCPRV2_B_RANGE(c)	\
-	((unsigned char)(c) >= 0xf5 && (unsigned char)(c) <= 0xfe)
-
-/*
- * Charset IDs for private single byte encodings (0xa0-0xef)
- */
-#define LC_SISHENG			0xa0	/* Chinese SiSheng characters for
-									 * PinYin/ZhuYin (not supported) */
-#define LC_IPA				0xa1	/* IPA (International Phonetic
-									 * Association) (not supported) */
-#define LC_VISCII_LOWER		0xa2	/* Vietnamese VISCII1.1 lower-case (not
-									 * supported) */
-#define LC_VISCII_UPPER		0xa3	/* Vietnamese VISCII1.1 upper-case (not
-									 * supported) */
-#define LC_ARABIC_DIGIT		0xa4	/* Arabic digit (not supported) */
-#define LC_ARABIC_1_COLUMN	0xa5	/* Arabic 1-column (not supported) */
-#define LC_ASCII_RIGHT_TO_LEFT	0xa6	/* ASCII (left half of ISO8859-1) with
-										 * right-to-left direction (not
-										 * supported) */
-#define LC_LAO				0xa7	/* Lao characters (ISO10646 0E80..0EDF)
-									 * (not supported) */
-#define LC_ARABIC_2_COLUMN	0xa8	/* Arabic 1-column (not supported) */
-
-/*
- * Charset IDs for private multibyte encodings (0xf0-0xff)
- */
-#define LC_INDIAN_1_COLUMN	0xf0	/* Indian charset for 1-column width
-									 * glyphs (not supported) */
-#define LC_TIBETAN_1_COLUMN 0xf1	/* Tibetan 1-column width glyphs (not
-									 * supported) */
-#define LC_UNICODE_SUBSET_2 0xf2	/* Unicode characters of the range
-									 * U+2500..U+33FF. (not supported) */
-#define LC_UNICODE_SUBSET_3 0xf3	/* Unicode characters of the range
-									 * U+E000..U+FFFF. (not supported) */
-#define LC_UNICODE_SUBSET	0xf4	/* Unicode characters of the range
-									 * U+0100..U+24FF. (not supported) */
-#define LC_ETHIOPIC			0xf5	/* Ethiopic characters (not supported) */
 #define LC_CNS11643_3		0xf6	/* CNS 11643-1992 Plane 3 */
 #define LC_CNS11643_4		0xf7	/* CNS 11643-1992 Plane 4 */
 #define LC_CNS11643_5		0xf8	/* CNS 11643-1992 Plane 5 */
 #define LC_CNS11643_6		0xf9	/* CNS 11643-1992 Plane 6 */
 #define LC_CNS11643_7		0xfa	/* CNS 11643-1992 Plane 7 */
-#define LC_INDIAN_2_COLUMN	0xfb	/* Indian charset for 2-column width
-									 * glyphs (not supported) */
-#define LC_TIBETAN			0xfc	/* Tibetan (not supported) */
-/* #define FREE				0xfd	free (unused) */
-/* #define FREE				0xfe	free (unused) */
-/* #define FREE				0xff	free (unused) */
-
-/*----------------------------------------------------
- * end of MULE stuff
- *----------------------------------------------------
+
+/*
+ * SJIS validation macros
  */
+#define ISSJISHEAD(c) (((c) >= 0x81 && (c) <= 0x9f) || ((c) >= 0xe0 && (c) <= 0xfc))
+#define ISSJISTAIL(c) (((c) >= 0x40 && (c) <= 0x7e) || ((c) >= 0x80 && (c) <= 0xfc))
 
 /*
  * PostgreSQL encoding identifiers
@@ -246,7 +80,7 @@ typedef enum pg_enc
 	PG_EUC_TW,					/* EUC for Taiwan */
 	PG_EUC_JIS_2004,			/* EUC-JIS-2004 */
 	PG_UTF8,					/* Unicode UTF8 */
-	PG_MULE_INTERNAL,			/* Mule internal code */
+	PG_UNUSED_1,				/* (Was Mule internal code) */
 	PG_LATIN1,					/* ISO-8859-1 Latin 1 */
 	PG_LATIN2,					/* ISO-8859-2 Latin 2 */
 	PG_LATIN3,					/* ISO-8859-3 Latin 3 */
@@ -290,18 +124,21 @@ typedef enum pg_enc
 
 #define PG_ENCODING_BE_LAST PG_KOI8U
 
+#define PG_UNUSED_ENCODING(_enc) \
+	((_enc) == PG_UNUSED_1)
+
 /*
  * Please use these tests before access to pg_enc2name_tbl[]
  * or to other places...
  */
 #define PG_VALID_BE_ENCODING(_enc) \
-		((_enc) >= 0 && (_enc) <= PG_ENCODING_BE_LAST)
+		((_enc) >= 0 && (_enc) <= PG_ENCODING_BE_LAST && !PG_UNUSED_ENCODING(_enc))
 
 #define PG_ENCODING_IS_CLIENT_ONLY(_enc) \
 		((_enc) > PG_ENCODING_BE_LAST && (_enc) < _PG_LAST_ENCODING_)
 
 #define PG_VALID_ENCODING(_enc) \
-		((_enc) >= 0 && (_enc) < _PG_LAST_ENCODING_)
+		((_enc) >= 0 && (_enc) < _PG_LAST_ENCODING_ && !PG_UNUSED_ENCODING(_enc))
 
 /* On FE are possible all encodings */
 #define PG_VALID_FE_ENCODING(_enc)	PG_VALID_ENCODING(_enc)
@@ -678,7 +515,6 @@ extern const char *get_encoding_name_for_icu(int encoding);
 
 extern bool pg_utf8_islegal(const unsigned char *source, int length);
 extern int	pg_utf_mblen(const unsigned char *s);
-extern int	pg_mule_mblen(const unsigned char *s);
 
 /*
  * The remaining functions are backend-only.
@@ -782,16 +618,6 @@ pg_noreturn extern void report_untranslatable_char(int src_encoding, int dest_en
 extern int	local2local(const unsigned char *l, unsigned char *p, int len,
 						int src_encoding, int dest_encoding,
 						const unsigned char *tab, bool noError);
-extern int	latin2mic(const unsigned char *l, unsigned char *p, int len,
-					  int lc, int encoding, bool noError);
-extern int	mic2latin(const unsigned char *mic, unsigned char *p, int len,
-					  int lc, int encoding, bool noError);
-extern int	latin2mic_with_table(const unsigned char *l, unsigned char *p,
-								 int len, int lc, int encoding,
-								 const unsigned char *tab, bool noError);
-extern int	mic2latin_with_table(const unsigned char *mic, unsigned char *p,
-								 int len, int lc, int encoding,
-								 const unsigned char *tab, bool noError);
 
 #ifdef WIN32
 extern WCHAR *pgwin32_message_to_UTF16(const char *str, int len, int *utf16len);
diff --git a/src/pl/plpython/plpy_util.c b/src/pl/plpython/plpy_util.c
index ef710aa371e..c2338decba2 100644
--- a/src/pl/plpython/plpy_util.c
+++ b/src/pl/plpython/plpy_util.c
@@ -40,8 +40,8 @@ PLyUnicode_Bytes(PyObject *unicode)
 	 *
 	 * PyUnicode_AsEncodedString could be used to encode the object directly
 	 * in the server encoding, but Python doesn't support all the encodings
-	 * that PostgreSQL does (EUC_TW and MULE_INTERNAL). UTF-8 is used as an
-	 * intermediary in PLyUnicode_FromString as well.
+	 * that PostgreSQL does (EUC_TW). UTF-8 is used as an intermediary in
+	 * PLyUnicode_FromString as well.
 	 */
 	if (GetDatabaseEncoding() != PG_UTF8)
 	{
diff --git a/src/test/mb/expected/mule_internal.out b/src/test/mb/expected/mule_internal.out
deleted file mode 100644
index ac8b57dc421..00000000000
--- a/src/test/mb/expected/mule_internal.out
+++ /dev/null
@@ -1,333 +0,0 @@
-drop table ’·×’»»’µ¡’ÍÑ’¸ì;
-ERROR:  table "’·×’»»’µ¡’ÍÑ’¸ì" does not exist
-create table ’·×’»»’µ¡’ÍÑ’¸ì (’ÍÑ’¸ì text, ’Ê¬’Îà’¥³’¡¼’¥É varchar, ’È÷’¹Í1A’¤À’¤è char(16));
-create index ’·×’»»’µ¡’ÍÑ’¸ìindex1 on ’·×’»»’µ¡’ÍÑ’¸ì using btree (’ÍÑ’¸ì);
-create index ’·×’»»’µ¡’ÍÑ’¸ìindex2 on ’·×’»»’µ¡’ÍÑ’¸ì using hash (’Ê¬’Îà’¥³’¡¼’¥É);
-insert into ’·×’»»’µ¡’ÍÑ’¸ì values('’¥³’¥ó’¥Ô’¥å’¡¼’¥¿’¥Ç’¥£’¥¹’¥×’¥ì’¥¤','’µ¡A01’¾å');
-insert into ’·×’»»’µ¡’ÍÑ’¸ì values('’¥³’¥ó’¥Ô’¥å’¡¼’¥¿’¥°’¥é’¥Õ’¥£’¥Ã’¥¯’¥¹','’Ê¬B10’Ãæ');
-insert into ’·×’»»’µ¡’ÍÑ’¸ì values('’¥³’¥ó’¥Ô’¥å’¡¼’¥¿’¥×’¥í’¥°’¥é’¥Þ’¡¼','’¿ÍZ01’²¼');
-vacuum ’·×’»»’µ¡’ÍÑ’¸ì;
-select * from ’·×’»»’µ¡’ÍÑ’¸ì;
-            ’ÍÑ’¸ì            | ’Ê¬’Îà’¥³’¡¼’¥É | ’È÷’¹Í1a’¤À’¤è 
-----------------------------+------------+------------
- ’¥³’¥ó’¥Ô’¥å’¡¼’¥¿’¥Ç’¥£’¥¹’¥×’¥ì’¥¤   | ’µ¡A01’¾å    | 
- ’¥³’¥ó’¥Ô’¥å’¡¼’¥¿’¥°’¥é’¥Õ’¥£’¥Ã’¥¯’¥¹ | ’Ê¬B10’Ãæ    | 
- ’¥³’¥ó’¥Ô’¥å’¡¼’¥¿’¥×’¥í’¥°’¥é’¥Þ’¡¼   | ’¿ÍZ01’²¼    | 
-(3 rows)
-
-select * from ’·×’»»’µ¡’ÍÑ’¸ì where ’Ê¬’Îà’¥³’¡¼’¥É = '’¿ÍZ01’²¼';
-           ’ÍÑ’¸ì           | ’Ê¬’Îà’¥³’¡¼’¥É | ’È÷’¹Í1a’¤À’¤è 
---------------------------+------------+------------
- ’¥³’¥ó’¥Ô’¥å’¡¼’¥¿’¥×’¥í’¥°’¥é’¥Þ’¡¼ | ’¿ÍZ01’²¼    | 
-(1 row)
-
-select * from ’·×’»»’µ¡’ÍÑ’¸ì where ’Ê¬’Îà’¥³’¡¼’¥É ~* '’¿Íz01’²¼';
-           ’ÍÑ’¸ì           | ’Ê¬’Îà’¥³’¡¼’¥É | ’È÷’¹Í1a’¤À’¤è 
---------------------------+------------+------------
- ’¥³’¥ó’¥Ô’¥å’¡¼’¥¿’¥×’¥í’¥°’¥é’¥Þ’¡¼ | ’¿ÍZ01’²¼    | 
-(1 row)
-
-select * from ’·×’»»’µ¡’ÍÑ’¸ì where ’Ê¬’Îà’¥³’¡¼’¥É like '_Z01_';
-           ’ÍÑ’¸ì           | ’Ê¬’Îà’¥³’¡¼’¥É | ’È÷’¹Í1a’¤À’¤è 
---------------------------+------------+------------
- ’¥³’¥ó’¥Ô’¥å’¡¼’¥¿’¥×’¥í’¥°’¥é’¥Þ’¡¼ | ’¿ÍZ01’²¼    | 
-(1 row)
-
-select * from ’·×’»»’µ¡’ÍÑ’¸ì where ’Ê¬’Îà’¥³’¡¼’¥É like '_Z%';
-           ’ÍÑ’¸ì           | ’Ê¬’Îà’¥³’¡¼’¥É | ’È÷’¹Í1a’¤À’¤è 
---------------------------+------------+------------
- ’¥³’¥ó’¥Ô’¥å’¡¼’¥¿’¥×’¥í’¥°’¥é’¥Þ’¡¼ | ’¿ÍZ01’²¼    | 
-(1 row)
-
-select * from ’·×’»»’µ¡’ÍÑ’¸ì where ’ÍÑ’¸ì ~ '’¥³’¥ó’¥Ô’¥å’¡¼’¥¿[’¥Ç’¥°]';
-            ’ÍÑ’¸ì            | ’Ê¬’Îà’¥³’¡¼’¥É | ’È÷’¹Í1a’¤À’¤è 
-----------------------------+------------+------------
- ’¥³’¥ó’¥Ô’¥å’¡¼’¥¿’¥Ç’¥£’¥¹’¥×’¥ì’¥¤   | ’µ¡A01’¾å    | 
- ’¥³’¥ó’¥Ô’¥å’¡¼’¥¿’¥°’¥é’¥Õ’¥£’¥Ã’¥¯’¥¹ | ’Ê¬B10’Ãæ    | 
-(2 rows)
-
-select * from ’·×’»»’µ¡’ÍÑ’¸ì where ’ÍÑ’¸ì ~* '’¥³’¥ó’¥Ô’¥å’¡¼’¥¿[’¥Ç’¥°]';
-            ’ÍÑ’¸ì            | ’Ê¬’Îà’¥³’¡¼’¥É | ’È÷’¹Í1a’¤À’¤è 
-----------------------------+------------+------------
- ’¥³’¥ó’¥Ô’¥å’¡¼’¥¿’¥Ç’¥£’¥¹’¥×’¥ì’¥¤   | ’µ¡A01’¾å    | 
- ’¥³’¥ó’¥Ô’¥å’¡¼’¥¿’¥°’¥é’¥Õ’¥£’¥Ã’¥¯’¥¹ | ’Ê¬B10’Ãæ    | 
-(2 rows)
-
-select *,character_length(’ÍÑ’¸ì) from ’·×’»»’µ¡’ÍÑ’¸ì;
-            ’ÍÑ’¸ì            | ’Ê¬’Îà’¥³’¡¼’¥É | ’È÷’¹Í1a’¤À’¤è | character_length 
-----------------------------+------------+------------+------------------
- ’¥³’¥ó’¥Ô’¥å’¡¼’¥¿’¥Ç’¥£’¥¹’¥×’¥ì’¥¤   | ’µ¡A01’¾å    |            |               12
- ’¥³’¥ó’¥Ô’¥å’¡¼’¥¿’¥°’¥é’¥Õ’¥£’¥Ã’¥¯’¥¹ | ’Ê¬B10’Ãæ    |            |               13
- ’¥³’¥ó’¥Ô’¥å’¡¼’¥¿’¥×’¥í’¥°’¥é’¥Þ’¡¼   | ’¿ÍZ01’²¼    |            |               12
-(3 rows)
-
-select *,octet_length(’ÍÑ’¸ì) from ’·×’»»’µ¡’ÍÑ’¸ì;
-            ’ÍÑ’¸ì            | ’Ê¬’Îà’¥³’¡¼’¥É | ’È÷’¹Í1a’¤À’¤è | octet_length 
-----------------------------+------------+------------+--------------
- ’¥³’¥ó’¥Ô’¥å’¡¼’¥¿’¥Ç’¥£’¥¹’¥×’¥ì’¥¤   | ’µ¡A01’¾å    |            |           36
- ’¥³’¥ó’¥Ô’¥å’¡¼’¥¿’¥°’¥é’¥Õ’¥£’¥Ã’¥¯’¥¹ | ’Ê¬B10’Ãæ    |            |           39
- ’¥³’¥ó’¥Ô’¥å’¡¼’¥¿’¥×’¥í’¥°’¥é’¥Þ’¡¼   | ’¿ÍZ01’²¼    |            |           36
-(3 rows)
-
-select *,position('’¥Ç' in ’ÍÑ’¸ì) from ’·×’»»’µ¡’ÍÑ’¸ì;
-            ’ÍÑ’¸ì            | ’Ê¬’Îà’¥³’¡¼’¥É | ’È÷’¹Í1a’¤À’¤è | position 
-----------------------------+------------+------------+----------
- ’¥³’¥ó’¥Ô’¥å’¡¼’¥¿’¥Ç’¥£’¥¹’¥×’¥ì’¥¤   | ’µ¡A01’¾å    |            |        7
- ’¥³’¥ó’¥Ô’¥å’¡¼’¥¿’¥°’¥é’¥Õ’¥£’¥Ã’¥¯’¥¹ | ’Ê¬B10’Ãæ    |            |        0
- ’¥³’¥ó’¥Ô’¥å’¡¼’¥¿’¥×’¥í’¥°’¥é’¥Þ’¡¼   | ’¿ÍZ01’²¼    |            |        0
-(3 rows)
-
-select *,substring(’ÍÑ’¸ì from 10 for 4) from ’·×’»»’µ¡’ÍÑ’¸ì;
-            ’ÍÑ’¸ì            | ’Ê¬’Îà’¥³’¡¼’¥É | ’È÷’¹Í1a’¤À’¤è | substring 
-----------------------------+------------+------------+-----------
- ’¥³’¥ó’¥Ô’¥å’¡¼’¥¿’¥Ç’¥£’¥¹’¥×’¥ì’¥¤   | ’µ¡A01’¾å    |            | ’¥×’¥ì’¥¤
- ’¥³’¥ó’¥Ô’¥å’¡¼’¥¿’¥°’¥é’¥Õ’¥£’¥Ã’¥¯’¥¹ | ’Ê¬B10’Ãæ    |            | ’¥£’¥Ã’¥¯’¥¹
- ’¥³’¥ó’¥Ô’¥å’¡¼’¥¿’¥×’¥í’¥°’¥é’¥Þ’¡¼   | ’¿ÍZ01’²¼    |            | ’¥é’¥Þ’¡¼
-(3 rows)
-
-drop table ‘¼Æ‘Ëã‘»ú‘Êõ‘Óï;
-ERROR:  table "‘¼Æ‘Ëã‘»ú‘Êõ‘Óï" does not exist
-create table ‘¼Æ‘Ëã‘»ú‘Êõ‘Óï(‘Êõ‘Óï text, ‘·Ö‘Àà‘ºÅ varchar, ‘±¸‘×¢1A char(16));
-create index ‘¼Æ‘Ëã‘»ú‘Êõ‘Óïindex1 on ‘¼Æ‘Ëã‘»ú‘Êõ‘Óï using btree(‘Êõ‘Óï);
-create index ‘¼Æ‘Ëã‘»ú‘Êõ‘Óïindex2 on ‘¼Æ‘Ëã‘»ú‘Êõ‘Óï using btree(‘·Ö‘Àà‘ºÅ);
-insert into ‘¼Æ‘Ëã‘»ú‘Êõ‘Óï values('‘µç‘ÄÔ‘ÏÔ‘Ê¾‘ÆÁ','‘»úA01‘ÉÏ');
-insert into ‘¼Æ‘Ëã‘»ú‘Êõ‘Óï values('‘µç‘ÄÔ‘Í¼‘ÐÎ','‘·ÖB01‘ÖÐ');
-insert into ‘¼Æ‘Ëã‘»ú‘Êõ‘Óï values('‘µç‘ÄÔ‘³Ì‘Ðò‘Ô±','‘ÈËZ01‘ÏÂ');
-vacuum ‘¼Æ‘Ëã‘»ú‘Êõ‘Óï;
-select * from ‘¼Æ‘Ëã‘»ú‘Êõ‘Óï;
-    ‘Êõ‘Óï    | ‘·Ö‘Àà‘ºÅ  | ‘±¸‘×¢1a 
-------------+---------+--------
- ‘µç‘ÄÔ‘ÏÔ‘Ê¾‘ÆÁ | ‘»úA01‘ÉÏ | 
- ‘µç‘ÄÔ‘Í¼‘ÐÎ   | ‘·ÖB01‘ÖÐ | 
- ‘µç‘ÄÔ‘³Ì‘Ðò‘Ô± | ‘ÈËZ01‘ÏÂ | 
-(3 rows)
-
-select * from ‘¼Æ‘Ëã‘»ú‘Êõ‘Óï where ‘·Ö‘Àà‘ºÅ = '‘ÈËZ01‘ÏÂ';
-    ‘Êõ‘Óï    | ‘·Ö‘Àà‘ºÅ  | ‘±¸‘×¢1a 
-------------+---------+--------
- ‘µç‘ÄÔ‘³Ì‘Ðò‘Ô± | ‘ÈËZ01‘ÏÂ | 
-(1 row)
-
-select * from ‘¼Æ‘Ëã‘»ú‘Êõ‘Óï where ‘·Ö‘Àà‘ºÅ ~* '‘ÈËz01‘ÏÂ';
-    ‘Êõ‘Óï    | ‘·Ö‘Àà‘ºÅ  | ‘±¸‘×¢1a 
-------------+---------+--------
- ‘µç‘ÄÔ‘³Ì‘Ðò‘Ô± | ‘ÈËZ01‘ÏÂ | 
-(1 row)
-
-select * from ‘¼Æ‘Ëã‘»ú‘Êõ‘Óï where ‘·Ö‘Àà‘ºÅ like '_Z01_';
-    ‘Êõ‘Óï    | ‘·Ö‘Àà‘ºÅ  | ‘±¸‘×¢1a 
-------------+---------+--------
- ‘µç‘ÄÔ‘³Ì‘Ðò‘Ô± | ‘ÈËZ01‘ÏÂ | 
-(1 row)
-
-select * from ‘¼Æ‘Ëã‘»ú‘Êõ‘Óï where ‘·Ö‘Àà‘ºÅ like '_Z%';
-    ‘Êõ‘Óï    | ‘·Ö‘Àà‘ºÅ  | ‘±¸‘×¢1a 
-------------+---------+--------
- ‘µç‘ÄÔ‘³Ì‘Ðò‘Ô± | ‘ÈËZ01‘ÏÂ | 
-(1 row)
-
-select * from ‘¼Æ‘Ëã‘»ú‘Êõ‘Óï where ‘Êõ‘Óï ~ '‘µç‘ÄÔ[‘ÏÔ‘Í¼]';
-    ‘Êõ‘Óï    | ‘·Ö‘Àà‘ºÅ  | ‘±¸‘×¢1a 
-------------+---------+--------
- ‘µç‘ÄÔ‘ÏÔ‘Ê¾‘ÆÁ | ‘»úA01‘ÉÏ | 
- ‘µç‘ÄÔ‘Í¼‘ÐÎ   | ‘·ÖB01‘ÖÐ | 
-(2 rows)
-
-select * from ‘¼Æ‘Ëã‘»ú‘Êõ‘Óï where ‘Êõ‘Óï ~* '‘µç‘ÄÔ[‘ÏÔ‘Í¼]';
-    ‘Êõ‘Óï    | ‘·Ö‘Àà‘ºÅ  | ‘±¸‘×¢1a 
-------------+---------+--------
- ‘µç‘ÄÔ‘ÏÔ‘Ê¾‘ÆÁ | ‘»úA01‘ÉÏ | 
- ‘µç‘ÄÔ‘Í¼‘ÐÎ   | ‘·ÖB01‘ÖÐ | 
-(2 rows)
-
-select *,character_length(‘Êõ‘Óï) from ‘¼Æ‘Ëã‘»ú‘Êõ‘Óï;
-    ‘Êõ‘Óï    | ‘·Ö‘Àà‘ºÅ  | ‘±¸‘×¢1a | character_length 
-------------+---------+--------+------------------
- ‘µç‘ÄÔ‘ÏÔ‘Ê¾‘ÆÁ | ‘»úA01‘ÉÏ |        |                5
- ‘µç‘ÄÔ‘Í¼‘ÐÎ   | ‘·ÖB01‘ÖÐ |        |                4
- ‘µç‘ÄÔ‘³Ì‘Ðò‘Ô± | ‘ÈËZ01‘ÏÂ |        |                5
-(3 rows)
-
-select *,octet_length(‘Êõ‘Óï) from ‘¼Æ‘Ëã‘»ú‘Êõ‘Óï;
-    ‘Êõ‘Óï    | ‘·Ö‘Àà‘ºÅ  | ‘±¸‘×¢1a | octet_length 
-------------+---------+--------+--------------
- ‘µç‘ÄÔ‘ÏÔ‘Ê¾‘ÆÁ | ‘»úA01‘ÉÏ |        |           15
- ‘µç‘ÄÔ‘Í¼‘ÐÎ   | ‘·ÖB01‘ÖÐ |        |           12
- ‘µç‘ÄÔ‘³Ì‘Ðò‘Ô± | ‘ÈËZ01‘ÏÂ |        |           15
-(3 rows)
-
-select *,position('‘ÏÔ' in ‘Êõ‘Óï) from ‘¼Æ‘Ëã‘»ú‘Êõ‘Óï;
-    ‘Êõ‘Óï    | ‘·Ö‘Àà‘ºÅ  | ‘±¸‘×¢1a | position 
-------------+---------+--------+----------
- ‘µç‘ÄÔ‘ÏÔ‘Ê¾‘ÆÁ | ‘»úA01‘ÉÏ |        |        3
- ‘µç‘ÄÔ‘Í¼‘ÐÎ   | ‘·ÖB01‘ÖÐ |        |        0
- ‘µç‘ÄÔ‘³Ì‘Ðò‘Ô± | ‘ÈËZ01‘ÏÂ |        |        0
-(3 rows)
-
-select *,substring(‘Êõ‘Óï from 3 for 4) from ‘¼Æ‘Ëã‘»ú‘Êõ‘Óï;
-    ‘Êõ‘Óï    | ‘·Ö‘Àà‘ºÅ  | ‘±¸‘×¢1a | substring 
-------------+---------+--------+-----------
- ‘µç‘ÄÔ‘ÏÔ‘Ê¾‘ÆÁ | ‘»úA01‘ÉÏ |        | ‘ÏÔ‘Ê¾‘ÆÁ
- ‘µç‘ÄÔ‘Í¼‘ÐÎ   | ‘·ÖB01‘ÖÐ |        | ‘Í¼‘ÐÎ
- ‘µç‘ÄÔ‘³Ì‘Ðò‘Ô± | ‘ÈËZ01‘ÏÂ |        | ‘³Ì‘Ðò‘Ô±
-(3 rows)
-
-drop table “Íª“ß©“Ñ¦“¿ë“¾î;
-ERROR:  table "“Íª“ß©“Ñ¦“¿ë“¾î" does not exist
-create table “Íª“ß©“Ñ¦“¿ë“¾î (“¿ë“¾î text, “ÝÂ“×¾“ÄÚ“µå varchar, “ºñ“°í1A“¶ó“±¸ char(16));
-create index “Íª“ß©“Ñ¦“¿ë“¾îindex1 on “Íª“ß©“Ñ¦“¿ë“¾î using btree (“¿ë“¾î);
-create index “Íª“ß©“Ñ¦“¿ë“¾îindex2 on “Íª“ß©“Ñ¦“¿ë“¾î using hash (“ÝÂ“×¾“ÄÚ“µå);
-insert into “Íª“ß©“Ñ¦“¿ë“¾î values('“ÄÄ“Ç»“ÅÍ“µð“½º“ÇÃ“·¹“ÀÌ', '“Ñ¦A01“ß¾');
-insert into “Íª“ß©“Ñ¦“¿ë“¾î values('“ÄÄ“Ç»“ÅÍ“±×“·¡“ÇÈ“½º', '“ÝÂB10“ñé');
-insert into “Íª“ß©“Ñ¦“¿ë“¾î values('“ÄÄ“Ç»“ÅÍ“ÇÁ“·Î“±×“·¡“¸Ó', '“ìÑZ01“ù»');
-vacuum “Íª“ß©“Ñ¦“¿ë“¾î;
-select * from “Íª“ß©“Ñ¦“¿ë“¾î;
-       “¿ë“¾î       | “ÝÂ“×¾“ÄÚ“µå | “ºñ“°í1a“¶ó“±¸ 
-------------------+----------+------------
- “ÄÄ“Ç»“ÅÍ“µð“½º“ÇÃ“·¹“ÀÌ | “Ñ¦A01“ß¾  | 
- “ÄÄ“Ç»“ÅÍ“±×“·¡“ÇÈ“½º   | “ÝÂB10“ñé  | 
- “ÄÄ“Ç»“ÅÍ“ÇÁ“·Î“±×“·¡“¸Ó | “ìÑZ01“ù»  | 
-(3 rows)
-
-select * from “Íª“ß©“Ñ¦“¿ë“¾î where “ÝÂ“×¾“ÄÚ“µå = '“ìÑZ01“ù»';
-       “¿ë“¾î       | “ÝÂ“×¾“ÄÚ“µå | “ºñ“°í1a“¶ó“±¸ 
-------------------+----------+------------
- “ÄÄ“Ç»“ÅÍ“ÇÁ“·Î“±×“·¡“¸Ó | “ìÑZ01“ù»  | 
-(1 row)
-
-select * from “Íª“ß©“Ñ¦“¿ë“¾î where “ÝÂ“×¾“ÄÚ“µå ~* '“ìÑz01“ù»';
-       “¿ë“¾î       | “ÝÂ“×¾“ÄÚ“µå | “ºñ“°í1a“¶ó“±¸ 
-------------------+----------+------------
- “ÄÄ“Ç»“ÅÍ“ÇÁ“·Î“±×“·¡“¸Ó | “ìÑZ01“ù»  | 
-(1 row)
-
-select * from “Íª“ß©“Ñ¦“¿ë“¾î where “ÝÂ“×¾“ÄÚ“µå like '_Z01_';
-       “¿ë“¾î       | “ÝÂ“×¾“ÄÚ“µå | “ºñ“°í1a“¶ó“±¸ 
-------------------+----------+------------
- “ÄÄ“Ç»“ÅÍ“ÇÁ“·Î“±×“·¡“¸Ó | “ìÑZ01“ù»  | 
-(1 row)
-
-select * from “Íª“ß©“Ñ¦“¿ë“¾î where “ÝÂ“×¾“ÄÚ“µå like '_Z%';
-       “¿ë“¾î       | “ÝÂ“×¾“ÄÚ“µå | “ºñ“°í1a“¶ó“±¸ 
-------------------+----------+------------
- “ÄÄ“Ç»“ÅÍ“ÇÁ“·Î“±×“·¡“¸Ó | “ìÑZ01“ù»  | 
-(1 row)
-
-select * from “Íª“ß©“Ñ¦“¿ë“¾î where “¿ë“¾î ~ '“ÄÄ“Ç»“ÅÍ[“µð“±×]';
-       “¿ë“¾î       | “ÝÂ“×¾“ÄÚ“µå | “ºñ“°í1a“¶ó“±¸ 
-------------------+----------+------------
- “ÄÄ“Ç»“ÅÍ“µð“½º“ÇÃ“·¹“ÀÌ | “Ñ¦A01“ß¾  | 
- “ÄÄ“Ç»“ÅÍ“±×“·¡“ÇÈ“½º   | “ÝÂB10“ñé  | 
-(2 rows)
-
-select * from “Íª“ß©“Ñ¦“¿ë“¾î where “¿ë“¾î ~* '“ÄÄ“Ç»“ÅÍ[“µð“±×]';
-       “¿ë“¾î       | “ÝÂ“×¾“ÄÚ“µå | “ºñ“°í1a“¶ó“±¸ 
-------------------+----------+------------
- “ÄÄ“Ç»“ÅÍ“µð“½º“ÇÃ“·¹“ÀÌ | “Ñ¦A01“ß¾  | 
- “ÄÄ“Ç»“ÅÍ“±×“·¡“ÇÈ“½º   | “ÝÂB10“ñé  | 
-(2 rows)
-
-select *,character_length(“¿ë“¾î) from “Íª“ß©“Ñ¦“¿ë“¾î;
-       “¿ë“¾î       | “ÝÂ“×¾“ÄÚ“µå | “ºñ“°í1a“¶ó“±¸ | character_length 
-------------------+----------+------------+------------------
- “ÄÄ“Ç»“ÅÍ“µð“½º“ÇÃ“·¹“ÀÌ | “Ñ¦A01“ß¾  |            |                8
- “ÄÄ“Ç»“ÅÍ“±×“·¡“ÇÈ“½º   | “ÝÂB10“ñé  |            |                7
- “ÄÄ“Ç»“ÅÍ“ÇÁ“·Î“±×“·¡“¸Ó | “ìÑZ01“ù»  |            |                8
-(3 rows)
-
-select *,octet_length(“¿ë“¾î) from “Íª“ß©“Ñ¦“¿ë“¾î;
-       “¿ë“¾î       | “ÝÂ“×¾“ÄÚ“µå | “ºñ“°í1a“¶ó“±¸ | octet_length 
-------------------+----------+------------+--------------
- “ÄÄ“Ç»“ÅÍ“µð“½º“ÇÃ“·¹“ÀÌ | “Ñ¦A01“ß¾  |            |           24
- “ÄÄ“Ç»“ÅÍ“±×“·¡“ÇÈ“½º   | “ÝÂB10“ñé  |            |           21
- “ÄÄ“Ç»“ÅÍ“ÇÁ“·Î“±×“·¡“¸Ó | “ìÑZ01“ù»  |            |           24
-(3 rows)
-
-select *,position('“µð' in “¿ë“¾î) from “Íª“ß©“Ñ¦“¿ë“¾î;
-       “¿ë“¾î       | “ÝÂ“×¾“ÄÚ“µå | “ºñ“°í1a“¶ó“±¸ | position 
-------------------+----------+------------+----------
- “ÄÄ“Ç»“ÅÍ“µð“½º“ÇÃ“·¹“ÀÌ | “Ñ¦A01“ß¾  |            |        4
- “ÄÄ“Ç»“ÅÍ“±×“·¡“ÇÈ“½º   | “ÝÂB10“ñé  |            |        0
- “ÄÄ“Ç»“ÅÍ“ÇÁ“·Î“±×“·¡“¸Ó | “ìÑZ01“ù»  |            |        0
-(3 rows)
-
-select *,substring(“¿ë“¾î from 3 for 4) from “Íª“ß©“Ñ¦“¿ë“¾î;
-       “¿ë“¾î       | “ÝÂ“×¾“ÄÚ“µå | “ºñ“°í1a“¶ó“±¸ | substring 
-------------------+----------+------------+-----------
- “ÄÄ“Ç»“ÅÍ“µð“½º“ÇÃ“·¹“ÀÌ | “Ñ¦A01“ß¾  |            | “ÅÍ“µð“½º“ÇÃ
- “ÄÄ“Ç»“ÅÍ“±×“·¡“ÇÈ“½º   | “ÝÂB10“ñé  |            | “ÅÍ“±×“·¡“ÇÈ
- “ÄÄ“Ç»“ÅÍ“ÇÁ“·Î“±×“·¡“¸Ó | “ìÑZ01“ù»  |            | “ÅÍ“ÇÁ“·Î“±×
-(3 rows)
-
-drop table test;
-ERROR:  table "test" does not exist
-create table test (t text);
-insert into test values('ENGLISH');
-insert into test values('FRAN�ÇAIS');
-insert into test values('ESPA�ÑOL');
-insert into test values('�ÍSLENSKA');
-insert into test values('ENGLISH FRAN�ÇAIS ESPA�ÑOL �ÍSLENSKA');
-vacuum test;
-select * from test;
-                 t                 
------------------------------------
- ENGLISH
- FRAN�ÇAIS
- ESPA�ÑOL
- �ÍSLENSKA
- ENGLISH FRAN�ÇAIS ESPA�ÑOL �ÍSLENSKA
-(5 rows)
-
-select * from test where t = 'ESPA�ÑOL';
-    t    
----------
- ESPA�ÑOL
-(1 row)
-
-select * from test where t ~* 'espa�Ñol';
-                 t                 
------------------------------------
- ESPA�ÑOL
- ENGLISH FRAN�ÇAIS ESPA�ÑOL �ÍSLENSKA
-(2 rows)
-
-select *,character_length(t) from test;
-                 t                 | character_length 
------------------------------------+------------------
- ENGLISH                           |                7
- FRAN�ÇAIS                          |                8
- ESPA�ÑOL                           |                7
- �ÍSLENSKA                          |                8
- ENGLISH FRAN�ÇAIS ESPA�ÑOL �ÍSLENSKA |               33
-(5 rows)
-
-select *,octet_length(t) from test;
-                 t                 | octet_length 
------------------------------------+--------------
- ENGLISH                           |            7
- FRAN�ÇAIS                          |            9
- ESPA�ÑOL                           |            8
- �ÍSLENSKA                          |            9
- ENGLISH FRAN�ÇAIS ESPA�ÑOL �ÍSLENSKA |           36
-(5 rows)
-
-select *,position('L' in t) from test;
-                 t                 | position 
------------------------------------+----------
- ENGLISH                           |        4
- FRAN�ÇAIS                          |        0
- ESPA�ÑOL                           |        7
- �ÍSLENSKA                          |        3
- ENGLISH FRAN�ÇAIS ESPA�ÑOL �ÍSLENSKA |        4
-(5 rows)
-
-select *,substring(t from 3 for 4) from test;
-                 t                 | substring 
------------------------------------+-----------
- ENGLISH                           | GLIS
- FRAN�ÇAIS                          | AN�ÇA
- ESPA�ÑOL                           | PA�ÑO
- �ÍSLENSKA                          | LENS
- ENGLISH FRAN�ÇAIS ESPA�ÑOL �ÍSLENSKA | GLIS
-(5 rows)
-
diff --git a/src/test/mb/mbregress.sh b/src/test/mb/mbregress.sh
index c313565fb4b..b650b31074f 100755
--- a/src/test/mb/mbregress.sh
+++ b/src/test/mb/mbregress.sh
@@ -21,7 +21,7 @@ PSQL="psql -X -n -e -q"
 
 # in the test list, client-only encodings must follow the server encoding
 # they're to be tested with; see hard-coded cases below
-tests="euc_jp sjis euc_kr euc_cn euc_tw big5 utf8 gb18030 mule_internal"
+tests="euc_jp sjis euc_kr euc_cn euc_tw big5 utf8 gb18030"
 
 EXITCODE=0
 
diff --git a/src/test/mb/sql/mule_internal.sql b/src/test/mb/sql/mule_internal.sql
deleted file mode 100644
index 2e381f0f7ed..00000000000
--- a/src/test/mb/sql/mule_internal.sql
+++ /dev/null
@@ -1,72 +0,0 @@
-drop table ’·×’»»’µ¡’ÍÑ’¸ì;
-create table ’·×’»»’µ¡’ÍÑ’¸ì (’ÍÑ’¸ì text, ’Ê¬’Îà’¥³’¡¼’¥É varchar, ’È÷’¹Í1A’¤À’¤è char(16));
-create index ’·×’»»’µ¡’ÍÑ’¸ìindex1 on ’·×’»»’µ¡’ÍÑ’¸ì using btree (’ÍÑ’¸ì);
-create index ’·×’»»’µ¡’ÍÑ’¸ìindex2 on ’·×’»»’µ¡’ÍÑ’¸ì using hash (’Ê¬’Îà’¥³’¡¼’¥É);
-insert into ’·×’»»’µ¡’ÍÑ’¸ì values('’¥³’¥ó’¥Ô’¥å’¡¼’¥¿’¥Ç’¥£’¥¹’¥×’¥ì’¥¤','’µ¡A01’¾å');
-insert into ’·×’»»’µ¡’ÍÑ’¸ì values('’¥³’¥ó’¥Ô’¥å’¡¼’¥¿’¥°’¥é’¥Õ’¥£’¥Ã’¥¯’¥¹','’Ê¬B10’Ãæ');
-insert into ’·×’»»’µ¡’ÍÑ’¸ì values('’¥³’¥ó’¥Ô’¥å’¡¼’¥¿’¥×’¥í’¥°’¥é’¥Þ’¡¼','’¿ÍZ01’²¼');
-vacuum ’·×’»»’µ¡’ÍÑ’¸ì;
-select * from ’·×’»»’µ¡’ÍÑ’¸ì;
-select * from ’·×’»»’µ¡’ÍÑ’¸ì where ’Ê¬’Îà’¥³’¡¼’¥É = '’¿ÍZ01’²¼';
-select * from ’·×’»»’µ¡’ÍÑ’¸ì where ’Ê¬’Îà’¥³’¡¼’¥É ~* '’¿Íz01’²¼';
-select * from ’·×’»»’µ¡’ÍÑ’¸ì where ’Ê¬’Îà’¥³’¡¼’¥É like '_Z01_';
-select * from ’·×’»»’µ¡’ÍÑ’¸ì where ’Ê¬’Îà’¥³’¡¼’¥É like '_Z%';
-select * from ’·×’»»’µ¡’ÍÑ’¸ì where ’ÍÑ’¸ì ~ '’¥³’¥ó’¥Ô’¥å’¡¼’¥¿[’¥Ç’¥°]';
-select * from ’·×’»»’µ¡’ÍÑ’¸ì where ’ÍÑ’¸ì ~* '’¥³’¥ó’¥Ô’¥å’¡¼’¥¿[’¥Ç’¥°]';
-select *,character_length(’ÍÑ’¸ì) from ’·×’»»’µ¡’ÍÑ’¸ì;
-select *,octet_length(’ÍÑ’¸ì) from ’·×’»»’µ¡’ÍÑ’¸ì;
-select *,position('’¥Ç' in ’ÍÑ’¸ì) from ’·×’»»’µ¡’ÍÑ’¸ì;
-select *,substring(’ÍÑ’¸ì from 10 for 4) from ’·×’»»’µ¡’ÍÑ’¸ì;
-drop table ‘¼Æ‘Ëã‘»ú‘Êõ‘Óï;
-create table ‘¼Æ‘Ëã‘»ú‘Êõ‘Óï(‘Êõ‘Óï text, ‘·Ö‘Àà‘ºÅ varchar, ‘±¸‘×¢1A char(16));
-create index ‘¼Æ‘Ëã‘»ú‘Êõ‘Óïindex1 on ‘¼Æ‘Ëã‘»ú‘Êõ‘Óï using btree(‘Êõ‘Óï);
-create index ‘¼Æ‘Ëã‘»ú‘Êõ‘Óïindex2 on ‘¼Æ‘Ëã‘»ú‘Êõ‘Óï using btree(‘·Ö‘Àà‘ºÅ);
-insert into ‘¼Æ‘Ëã‘»ú‘Êõ‘Óï values('‘µç‘ÄÔ‘ÏÔ‘Ê¾‘ÆÁ','‘»úA01‘ÉÏ');
-insert into ‘¼Æ‘Ëã‘»ú‘Êõ‘Óï values('‘µç‘ÄÔ‘Í¼‘ÐÎ','‘·ÖB01‘ÖÐ');
-insert into ‘¼Æ‘Ëã‘»ú‘Êõ‘Óï values('‘µç‘ÄÔ‘³Ì‘Ðò‘Ô±','‘ÈËZ01‘ÏÂ');
-vacuum ‘¼Æ‘Ëã‘»ú‘Êõ‘Óï;
-select * from ‘¼Æ‘Ëã‘»ú‘Êõ‘Óï;
-select * from ‘¼Æ‘Ëã‘»ú‘Êõ‘Óï where ‘·Ö‘Àà‘ºÅ = '‘ÈËZ01‘ÏÂ';
-select * from ‘¼Æ‘Ëã‘»ú‘Êõ‘Óï where ‘·Ö‘Àà‘ºÅ ~* '‘ÈËz01‘ÏÂ';
-select * from ‘¼Æ‘Ëã‘»ú‘Êõ‘Óï where ‘·Ö‘Àà‘ºÅ like '_Z01_';
-select * from ‘¼Æ‘Ëã‘»ú‘Êõ‘Óï where ‘·Ö‘Àà‘ºÅ like '_Z%';
-select * from ‘¼Æ‘Ëã‘»ú‘Êõ‘Óï where ‘Êõ‘Óï ~ '‘µç‘ÄÔ[‘ÏÔ‘Í¼]';
-select * from ‘¼Æ‘Ëã‘»ú‘Êõ‘Óï where ‘Êõ‘Óï ~* '‘µç‘ÄÔ[‘ÏÔ‘Í¼]';
-select *,character_length(‘Êõ‘Óï) from ‘¼Æ‘Ëã‘»ú‘Êõ‘Óï;
-select *,octet_length(‘Êõ‘Óï) from ‘¼Æ‘Ëã‘»ú‘Êõ‘Óï;
-select *,position('‘ÏÔ' in ‘Êõ‘Óï) from ‘¼Æ‘Ëã‘»ú‘Êõ‘Óï;
-select *,substring(‘Êõ‘Óï from 3 for 4) from ‘¼Æ‘Ëã‘»ú‘Êõ‘Óï;
-drop table “Íª“ß©“Ñ¦“¿ë“¾î;
-create table “Íª“ß©“Ñ¦“¿ë“¾î (“¿ë“¾î text, “ÝÂ“×¾“ÄÚ“µå varchar, “ºñ“°í1A“¶ó“±¸ char(16));
-create index “Íª“ß©“Ñ¦“¿ë“¾îindex1 on “Íª“ß©“Ñ¦“¿ë“¾î using btree (“¿ë“¾î);
-create index “Íª“ß©“Ñ¦“¿ë“¾îindex2 on “Íª“ß©“Ñ¦“¿ë“¾î using hash (“ÝÂ“×¾“ÄÚ“µå);
-insert into “Íª“ß©“Ñ¦“¿ë“¾î values('“ÄÄ“Ç»“ÅÍ“µð“½º“ÇÃ“·¹“ÀÌ', '“Ñ¦A01“ß¾');
-insert into “Íª“ß©“Ñ¦“¿ë“¾î values('“ÄÄ“Ç»“ÅÍ“±×“·¡“ÇÈ“½º', '“ÝÂB10“ñé');
-insert into “Íª“ß©“Ñ¦“¿ë“¾î values('“ÄÄ“Ç»“ÅÍ“ÇÁ“·Î“±×“·¡“¸Ó', '“ìÑZ01“ù»');
-vacuum “Íª“ß©“Ñ¦“¿ë“¾î;
-select * from “Íª“ß©“Ñ¦“¿ë“¾î;
-select * from “Íª“ß©“Ñ¦“¿ë“¾î where “ÝÂ“×¾“ÄÚ“µå = '“ìÑZ01“ù»';
-select * from “Íª“ß©“Ñ¦“¿ë“¾î where “ÝÂ“×¾“ÄÚ“µå ~* '“ìÑz01“ù»';
-select * from “Íª“ß©“Ñ¦“¿ë“¾î where “ÝÂ“×¾“ÄÚ“µå like '_Z01_';
-select * from “Íª“ß©“Ñ¦“¿ë“¾î where “ÝÂ“×¾“ÄÚ“µå like '_Z%';
-select * from “Íª“ß©“Ñ¦“¿ë“¾î where “¿ë“¾î ~ '“ÄÄ“Ç»“ÅÍ[“µð“±×]';
-select * from “Íª“ß©“Ñ¦“¿ë“¾î where “¿ë“¾î ~* '“ÄÄ“Ç»“ÅÍ[“µð“±×]';
-select *,character_length(“¿ë“¾î) from “Íª“ß©“Ñ¦“¿ë“¾î;
-select *,octet_length(“¿ë“¾î) from “Íª“ß©“Ñ¦“¿ë“¾î;
-select *,position('“µð' in “¿ë“¾î) from “Íª“ß©“Ñ¦“¿ë“¾î;
-select *,substring(“¿ë“¾î from 3 for 4) from “Íª“ß©“Ñ¦“¿ë“¾î;
-drop table test;
-create table test (t text);
-insert into test values('ENGLISH');
-insert into test values('FRAN�ÇAIS');
-insert into test values('ESPA�ÑOL');
-insert into test values('�ÍSLENSKA');
-insert into test values('ENGLISH FRAN�ÇAIS ESPA�ÑOL �ÍSLENSKA');
-vacuum test;
-select * from test;
-select * from test where t = 'ESPA�ÑOL';
-select * from test where t ~* 'espa�Ñol';
-select *,character_length(t) from test;
-select *,octet_length(t) from test;
-select *,position('L' in t) from test;
-select *,substring(t from 3 for 4) from test;
diff --git a/src/test/modules/test_escape/test_escape.c b/src/test/modules/test_escape/test_escape.c
index 1606b5a46b5..6dab4f2cf5b 100644
--- a/src/test/modules/test_escape/test_escape.c
+++ b/src/test/modules/test_escape/test_escape.c
@@ -526,8 +526,6 @@ static pe_test_vector pe_test_vectors[] =
 	TV("gbk", "\x80\""),
 	TV("gbk", "\x80\\"),
 
-	TV("mule_internal", "\\\x9c';\0;"),
-
 	TV("sql_ascii", "1\xC0'"),
 
 	/*
diff --git a/src/test/regress/expected/conversion.out b/src/test/regress/expected/conversion.out
index 6f3e47f20a4..01491ac6338 100644
--- a/src/test/regress/expected/conversion.out
+++ b/src/test/regress/expected/conversion.out
@@ -588,16 +588,6 @@ select description, inbytes, (test_conv(inbytes, 'iso8859-5', 'koi8r')).* from i
  invalid, NUL byte | \xe4dede00 | \xc6cfcf | \x00     | invalid byte sequence for encoding "ISO_8859_5": 0x00
 (5 rows)
 
-select description, inbytes, (test_conv(inbytes, 'iso8859_5', 'mule_internal')).* from iso8859_5_inputs;
-    description    |  inbytes   |     result     | errorat  |                         error                         
--------------------+------------+----------------+----------+-------------------------------------------------------
- valid, pure ASCII | \x666f6f   | \x666f6f       |          | 
- valid             | \xe4dede   | \x8bc68bcf8bcf |          | 
- invalid, NUL byte | \x00       | \x             | \x00     | invalid byte sequence for encoding "ISO_8859_5": 0x00
- invalid, NUL byte | \xe400dede | \x8bc6         | \x00dede | invalid byte sequence for encoding "ISO_8859_5": 0x00
- invalid, NUL byte | \xe4dede00 | \x8bc68bcf8bcf | \x00     | invalid byte sequence for encoding "ISO_8859_5": 0x00
-(5 rows)
-
 --
 -- Big5
 --
@@ -630,120 +620,3 @@ select description, inbytes, (test_conv(inbytes, 'big5', 'utf8')).* from big5_in
  invalid, NUL byte              | \x666f6fb64800 | \x666f6fe8b1a1 | \x00     | invalid byte sequence for encoding "BIG5": 0x00
 (5 rows)
 
-select description, inbytes, (test_conv(inbytes, 'big5', 'mule_internal')).* from big5_inputs;
-          description           |    inbytes     |     result     | errorat  |                        error                         
---------------------------------+----------------+----------------+----------+------------------------------------------------------
- valid, pure ASCII              | \x666f6f       | \x666f6f       |          | 
- valid                          | \x666f6fb648   | \x666f6f95e2af |          | 
- valid, no translation to UTF-8 | \x666f6fa27f   | \x666f6f95a3c1 |          | 
- invalid, NUL byte              | \x666f6fb60048 | \x666f6f       | \xb60048 | invalid byte sequence for encoding "BIG5": 0xb6 0x00
- invalid, NUL byte              | \x666f6fb64800 | \x666f6f95e2af | \x00     | invalid byte sequence for encoding "BIG5": 0x00
-(5 rows)
-
---
--- MULE_INTERNAL
---
-CREATE TABLE mic_inputs (inbytes bytea, description text);
-insert into mic_inputs  values
-  ('\x666f6f',		'valid, pure ASCII'),
-  ('\x8bc68bcf8bcf',	'valid (in KOI8R)'),
-  ('\x8bc68bcf8b',	'invalid,incomplete char'),
-  ('\x92bedd',		'valid (in SHIFT_JIS)'),
-  ('\x92be',		'invalid, incomplete char)'),
-  ('\x666f6f95a3c1',	'valid (in Big5)'),
-  ('\x666f6f95a3',	'invalid, incomplete char'),
-  ('\x9200bedd',	'invalid, NUL byte'),
-  ('\x92bedd00',	'invalid, NUL byte'),
-  ('\x8b00c68bcf8bcf',	'invalid, NUL byte');
--- Test MULE_INTERNAL verification
-select description, inbytes, (test_conv(inbytes, 'mule_internal', 'mule_internal')).* from mic_inputs;
-        description        |     inbytes      |     result     |     errorat      |                               error                                
----------------------------+------------------+----------------+------------------+--------------------------------------------------------------------
- valid, pure ASCII         | \x666f6f         | \x666f6f       |                  | 
- valid (in KOI8R)          | \x8bc68bcf8bcf   | \x8bc68bcf8bcf |                  | 
- invalid,incomplete char   | \x8bc68bcf8b     | \x8bc68bcf     | \x8b             | invalid byte sequence for encoding "MULE_INTERNAL": 0x8b
- valid (in SHIFT_JIS)      | \x92bedd         | \x92bedd       |                  | 
- invalid, incomplete char) | \x92be           | \x             | \x92be           | invalid byte sequence for encoding "MULE_INTERNAL": 0x92 0xbe
- valid (in Big5)           | \x666f6f95a3c1   | \x666f6f95a3c1 |                  | 
- invalid, incomplete char  | \x666f6f95a3     | \x666f6f       | \x95a3           | invalid byte sequence for encoding "MULE_INTERNAL": 0x95 0xa3
- invalid, NUL byte         | \x9200bedd       | \x             | \x9200bedd       | invalid byte sequence for encoding "MULE_INTERNAL": 0x92 0x00 0xbe
- invalid, NUL byte         | \x92bedd00       | \x92bedd       | \x00             | invalid byte sequence for encoding "MULE_INTERNAL": 0x00
- invalid, NUL byte         | \x8b00c68bcf8bcf | \x             | \x8b00c68bcf8bcf | invalid byte sequence for encoding "MULE_INTERNAL": 0x8b 0x00
-(10 rows)
-
--- Test conversions from MULE_INTERNAL
-select description, inbytes, (test_conv(inbytes, 'mule_internal', 'koi8r')).* from mic_inputs;
-        description        |     inbytes      |  result  |     errorat      |                                                     error                                                     
----------------------------+------------------+----------+------------------+---------------------------------------------------------------------------------------------------------------
- valid, pure ASCII         | \x666f6f         | \x666f6f |                  | 
- valid (in KOI8R)          | \x8bc68bcf8bcf   | \xc6cfcf |                  | 
- invalid,incomplete char   | \x8bc68bcf8b     | \xc6cf   | \x8b             | invalid byte sequence for encoding "MULE_INTERNAL": 0x8b
- valid (in SHIFT_JIS)      | \x92bedd         | \x       | \x92bedd         | character with byte sequence 0x92 0xbe 0xdd in encoding "MULE_INTERNAL" has no equivalent in encoding "KOI8R"
- invalid, incomplete char) | \x92be           | \x       | \x92be           | invalid byte sequence for encoding "MULE_INTERNAL": 0x92 0xbe
- valid (in Big5)           | \x666f6f95a3c1   | \x666f6f | \x95a3c1         | character with byte sequence 0x95 0xa3 0xc1 in encoding "MULE_INTERNAL" has no equivalent in encoding "KOI8R"
- invalid, incomplete char  | \x666f6f95a3     | \x666f6f | \x95a3           | invalid byte sequence for encoding "MULE_INTERNAL": 0x95 0xa3
- invalid, NUL byte         | \x9200bedd       | \x       | \x9200bedd       | character with byte sequence 0x92 0x00 0xbe in encoding "MULE_INTERNAL" has no equivalent in encoding "KOI8R"
- invalid, NUL byte         | \x92bedd00       | \x       | \x92bedd00       | character with byte sequence 0x92 0xbe 0xdd in encoding "MULE_INTERNAL" has no equivalent in encoding "KOI8R"
- invalid, NUL byte         | \x8b00c68bcf8bcf | \x       | \x8b00c68bcf8bcf | character with byte sequence 0x8b 0x00 in encoding "MULE_INTERNAL" has no equivalent in encoding "KOI8R"
-(10 rows)
-
-select description, inbytes, (test_conv(inbytes, 'mule_internal', 'iso8859-5')).* from mic_inputs;
-        description        |     inbytes      |  result  |     errorat      |                                                       error                                                        
----------------------------+------------------+----------+------------------+--------------------------------------------------------------------------------------------------------------------
- valid, pure ASCII         | \x666f6f         | \x666f6f |                  | 
- valid (in KOI8R)          | \x8bc68bcf8bcf   | \xe4dede |                  | 
- invalid,incomplete char   | \x8bc68bcf8b     | \xe4de   | \x8b             | invalid byte sequence for encoding "MULE_INTERNAL": 0x8b
- valid (in SHIFT_JIS)      | \x92bedd         | \x       | \x92bedd         | character with byte sequence 0x92 0xbe 0xdd in encoding "MULE_INTERNAL" has no equivalent in encoding "ISO_8859_5"
- invalid, incomplete char) | \x92be           | \x       | \x92be           | invalid byte sequence for encoding "MULE_INTERNAL": 0x92 0xbe
- valid (in Big5)           | \x666f6f95a3c1   | \x666f6f | \x95a3c1         | character with byte sequence 0x95 0xa3 0xc1 in encoding "MULE_INTERNAL" has no equivalent in encoding "ISO_8859_5"
- invalid, incomplete char  | \x666f6f95a3     | \x666f6f | \x95a3           | invalid byte sequence for encoding "MULE_INTERNAL": 0x95 0xa3
- invalid, NUL byte         | \x9200bedd       | \x       | \x9200bedd       | character with byte sequence 0x92 0x00 0xbe in encoding "MULE_INTERNAL" has no equivalent in encoding "ISO_8859_5"
- invalid, NUL byte         | \x92bedd00       | \x       | \x92bedd00       | character with byte sequence 0x92 0xbe 0xdd in encoding "MULE_INTERNAL" has no equivalent in encoding "ISO_8859_5"
- invalid, NUL byte         | \x8b00c68bcf8bcf | \x       | \x8b00c68bcf8bcf | character with byte sequence 0x8b 0x00 in encoding "MULE_INTERNAL" has no equivalent in encoding "ISO_8859_5"
-(10 rows)
-
-select description, inbytes, (test_conv(inbytes, 'mule_internal', 'sjis')).* from mic_inputs;
-        description        |     inbytes      |  result  |     errorat      |                                                    error                                                     
----------------------------+------------------+----------+------------------+--------------------------------------------------------------------------------------------------------------
- valid, pure ASCII         | \x666f6f         | \x666f6f |                  | 
- valid (in KOI8R)          | \x8bc68bcf8bcf   | \x       | \x8bc68bcf8bcf   | character with byte sequence 0x8b 0xc6 in encoding "MULE_INTERNAL" has no equivalent in encoding "SJIS"
- invalid,incomplete char   | \x8bc68bcf8b     | \x       | \x8bc68bcf8b     | character with byte sequence 0x8b 0xc6 in encoding "MULE_INTERNAL" has no equivalent in encoding "SJIS"
- valid (in SHIFT_JIS)      | \x92bedd         | \x8fdb   |                  | 
- invalid, incomplete char) | \x92be           | \x       | \x92be           | invalid byte sequence for encoding "MULE_INTERNAL": 0x92 0xbe
- valid (in Big5)           | \x666f6f95a3c1   | \x666f6f | \x95a3c1         | character with byte sequence 0x95 0xa3 0xc1 in encoding "MULE_INTERNAL" has no equivalent in encoding "SJIS"
- invalid, incomplete char  | \x666f6f95a3     | \x666f6f | \x95a3           | invalid byte sequence for encoding "MULE_INTERNAL": 0x95 0xa3
- invalid, NUL byte         | \x9200bedd       | \x       | \x9200bedd       | invalid byte sequence for encoding "MULE_INTERNAL": 0x92 0x00 0xbe
- invalid, NUL byte         | \x92bedd00       | \x8fdb   | \x00             | invalid byte sequence for encoding "MULE_INTERNAL": 0x00
- invalid, NUL byte         | \x8b00c68bcf8bcf | \x       | \x8b00c68bcf8bcf | invalid byte sequence for encoding "MULE_INTERNAL": 0x8b 0x00
-(10 rows)
-
-select description, inbytes, (test_conv(inbytes, 'mule_internal', 'big5')).* from mic_inputs;
-        description        |     inbytes      |    result    |     errorat      |                                                    error                                                     
----------------------------+------------------+--------------+------------------+--------------------------------------------------------------------------------------------------------------
- valid, pure ASCII         | \x666f6f         | \x666f6f     |                  | 
- valid (in KOI8R)          | \x8bc68bcf8bcf   | \x           | \x8bc68bcf8bcf   | character with byte sequence 0x8b 0xc6 in encoding "MULE_INTERNAL" has no equivalent in encoding "BIG5"
- invalid,incomplete char   | \x8bc68bcf8b     | \x           | \x8bc68bcf8b     | character with byte sequence 0x8b 0xc6 in encoding "MULE_INTERNAL" has no equivalent in encoding "BIG5"
- valid (in SHIFT_JIS)      | \x92bedd         | \x           | \x92bedd         | character with byte sequence 0x92 0xbe 0xdd in encoding "MULE_INTERNAL" has no equivalent in encoding "BIG5"
- invalid, incomplete char) | \x92be           | \x           | \x92be           | invalid byte sequence for encoding "MULE_INTERNAL": 0x92 0xbe
- valid (in Big5)           | \x666f6f95a3c1   | \x666f6fa2a1 |                  | 
- invalid, incomplete char  | \x666f6f95a3     | \x666f6f     | \x95a3           | invalid byte sequence for encoding "MULE_INTERNAL": 0x95 0xa3
- invalid, NUL byte         | \x9200bedd       | \x           | \x9200bedd       | invalid byte sequence for encoding "MULE_INTERNAL": 0x92 0x00 0xbe
- invalid, NUL byte         | \x92bedd00       | \x           | \x92bedd00       | character with byte sequence 0x92 0xbe 0xdd in encoding "MULE_INTERNAL" has no equivalent in encoding "BIG5"
- invalid, NUL byte         | \x8b00c68bcf8bcf | \x           | \x8b00c68bcf8bcf | invalid byte sequence for encoding "MULE_INTERNAL": 0x8b 0x00
-(10 rows)
-
-select description, inbytes, (test_conv(inbytes, 'mule_internal', 'euc_jp')).* from mic_inputs;
-        description        |     inbytes      |  result  |     errorat      |                                                     error                                                      
----------------------------+------------------+----------+------------------+----------------------------------------------------------------------------------------------------------------
- valid, pure ASCII         | \x666f6f         | \x666f6f |                  | 
- valid (in KOI8R)          | \x8bc68bcf8bcf   | \x       | \x8bc68bcf8bcf   | character with byte sequence 0x8b 0xc6 in encoding "MULE_INTERNAL" has no equivalent in encoding "EUC_JP"
- invalid,incomplete char   | \x8bc68bcf8b     | \x       | \x8bc68bcf8b     | character with byte sequence 0x8b 0xc6 in encoding "MULE_INTERNAL" has no equivalent in encoding "EUC_JP"
- valid (in SHIFT_JIS)      | \x92bedd         | \xbedd   |                  | 
- invalid, incomplete char) | \x92be           | \x       | \x92be           | invalid byte sequence for encoding "MULE_INTERNAL": 0x92 0xbe
- valid (in Big5)           | \x666f6f95a3c1   | \x666f6f | \x95a3c1         | character with byte sequence 0x95 0xa3 0xc1 in encoding "MULE_INTERNAL" has no equivalent in encoding "EUC_JP"
- invalid, incomplete char  | \x666f6f95a3     | \x666f6f | \x95a3           | invalid byte sequence for encoding "MULE_INTERNAL": 0x95 0xa3
- invalid, NUL byte         | \x9200bedd       | \x       | \x9200bedd       | invalid byte sequence for encoding "MULE_INTERNAL": 0x92 0x00 0xbe
- invalid, NUL byte         | \x92bedd00       | \xbedd   | \x00             | invalid byte sequence for encoding "MULE_INTERNAL": 0x00
- invalid, NUL byte         | \x8b00c68bcf8bcf | \x       | \x8b00c68bcf8bcf | invalid byte sequence for encoding "MULE_INTERNAL": 0x8b 0x00
-(10 rows)
-
diff --git a/src/test/regress/expected/encoding.out b/src/test/regress/expected/encoding.out
index ea1f38cff41..6ac899a8c23 100644
--- a/src/test/regress/expected/encoding.out
+++ b/src/test/regress/expected/encoding.out
@@ -302,16 +302,7 @@ INSERT INTO encoding_tests VALUES
 	('UTF8',   '6 byte, unsupported', '\xfd8283'),
 	('UTF8',   '6 byte, unsupported', '\xfd828384'),
 	('UTF8',   '6 byte, unsupported', '\xfd82838485'),
-	('UTF8',   '6 byte, unsupported', '\xfd8283848586'),
-	-- MULE_INTERNAL
-	-- 2 81..8d LC1
-	-- 3 90..99 LC2
-	('MULE_INTERNAL', 'ASCII',         'a'),
-	('MULE_INTERNAL', 'LC1, short',    '\x81'),
-	('MULE_INTERNAL', 'LC1',           '\x8182'),
-	('MULE_INTERNAL', 'LC2, short',    '\x90'),
-	('MULE_INTERNAL', 'LC2, short',    '\x9082'),
-	('MULE_INTERNAL', 'LC2',           '\x908283');
+	('UTF8',   '6 byte, unsupported', '\xfd8283848586');
 SELECT COUNT(test_encoding(encoding, description, input)) > 0
 FROM encoding_tests;
 NOTICE:  LATIN1 ASCII:                \x61 -> {97} -> \x61 = OK
@@ -364,12 +355,6 @@ NOTICE:  UTF8 6 byte, unsupported:    \xfd8283 -> {253,130,131} -> \xc3bdc282c28
 NOTICE:  UTF8 6 byte, unsupported:    \xfd828384 -> {253,130,131,132} -> \xc3bdc282c283c284 = failed
 NOTICE:  UTF8 6 byte, unsupported:    \xfd82838485 -> {253,130,131,132,133} -> \xc3bdc282c283c284c285 = failed
 NOTICE:  UTF8 6 byte, unsupported:    \xfd8283848586 -> {253,130,131,132,133,134} -> \xc3bdc282c283c284c285c286 = failed
-NOTICE:  MULE_INTERNAL ASCII:         \x61 -> {97} -> \x61 = OK
-NOTICE:  MULE_INTERNAL LC1, short:    \x81 -> {} -> \x = truncated
-NOTICE:  MULE_INTERNAL LC1:           \x8182 -> {8454274} -> \x8182 = OK
-NOTICE:  MULE_INTERNAL LC2, short:    \x90 -> {} -> \x = truncated
-NOTICE:  MULE_INTERNAL LC2, short:    \x9082 -> {} -> \x = truncated
-NOTICE:  MULE_INTERNAL LC2:           \x908283 -> {9470595} -> \x908283 = OK
  ?column? 
 ----------
  t
diff --git a/src/test/regress/expected/object_address.out b/src/test/regress/expected/object_address.out
index b026d38dcfb..8c4f0f55714 100644
--- a/src/test/regress/expected/object_address.out
+++ b/src/test/regress/expected/object_address.out
@@ -411,7 +411,7 @@ WITH objects (type, name, args) AS (VALUES
     ('collation', '{default}', '{}'),
     ('table constraint', '{addr_nsp, gentable, a_chk}', '{}'),
     ('domain constraint', '{addr_nsp.gendomain}', '{domconstr}'),
-    ('conversion', '{pg_catalog, koi8_r_to_mic}', '{}'),
+    ('conversion', '{pg_catalog, koi8_r_to_utf8}', '{}'),
     ('default value', '{addr_nsp, gentable, b}', '{}'),
     ('language', '{plpgsql}', '{}'),
     -- large object
@@ -485,7 +485,7 @@ default value|NULL|NULL|for addr_nsp.gentable.b|t
 cast|NULL|NULL|(bigint AS integer)|t
 table constraint|addr_nsp|NULL|a_chk on addr_nsp.gentable|t
 domain constraint|addr_nsp|NULL|domconstr on addr_nsp.gendomain|t
-conversion|pg_catalog|koi8_r_to_mic|pg_catalog.koi8_r_to_mic|t
+conversion|pg_catalog|koi8_r_to_utf8|pg_catalog.koi8_r_to_utf8|t
 language|NULL|plpgsql|plpgsql|t
 schema|NULL|addr_nsp|addr_nsp|t
 operator class|pg_catalog|int4_ops|pg_catalog.int4_ops USING btree|t
diff --git a/src/test/regress/expected/xml.out b/src/test/regress/expected/xml.out
index 103a22a3b1d..449733f8ae9 100644
--- a/src/test/regress/expected/xml.out
+++ b/src/test/regress/expected/xml.out
@@ -971,9 +971,7 @@ BEGIN
   END IF;
 EXCEPTION
   -- character with byte sequence 0xc2 0xb0 in encoding "UTF8" has no equivalent in encoding "LATIN8"
-  WHEN untranslatable_character
-  -- default conversion function for encoding "UTF8" to "MULE_INTERNAL" does not exist
-  OR undefined_function
+  WHEN undefined_function
   -- unsupported XML feature
   OR feature_not_supported THEN
     RAISE LOG 'skip: %', SQLERRM;
diff --git a/src/test/regress/expected/xml_1.out b/src/test/regress/expected/xml_1.out
index 73c411118a3..a962fce36b9 100644
--- a/src/test/regress/expected/xml_1.out
+++ b/src/test/regress/expected/xml_1.out
@@ -714,9 +714,7 @@ BEGIN
   END IF;
 EXCEPTION
   -- character with byte sequence 0xc2 0xb0 in encoding "UTF8" has no equivalent in encoding "LATIN8"
-  WHEN untranslatable_character
-  -- default conversion function for encoding "UTF8" to "MULE_INTERNAL" does not exist
-  OR undefined_function
+  WHEN undefined_function
   -- unsupported XML feature
   OR feature_not_supported THEN
     RAISE LOG 'skip: %', SQLERRM;
diff --git a/src/test/regress/expected/xml_2.out b/src/test/regress/expected/xml_2.out
index a85d95358d9..d7c90725cfc 100644
--- a/src/test/regress/expected/xml_2.out
+++ b/src/test/regress/expected/xml_2.out
@@ -957,9 +957,7 @@ BEGIN
   END IF;
 EXCEPTION
   -- character with byte sequence 0xc2 0xb0 in encoding "UTF8" has no equivalent in encoding "LATIN8"
-  WHEN untranslatable_character
-  -- default conversion function for encoding "UTF8" to "MULE_INTERNAL" does not exist
-  OR undefined_function
+  WHEN undefined_function
   -- unsupported XML feature
   OR feature_not_supported THEN
     RAISE LOG 'skip: %', SQLERRM;
diff --git a/src/test/regress/regress.c b/src/test/regress/regress.c
index 96cf30ac925..0237eeadf15 100644
--- a/src/test/regress/regress.c
+++ b/src/test/regress/regress.c
@@ -949,6 +949,8 @@ test_enc_setup(PG_FUNCTION_ARGS)
 					mblen,
 					valid;
 
+		if (!PG_VALID_ENCODING(i))
+			continue;
 		if (pg_encoding_max_length(i) == 1)
 			continue;
 		pg_encoding_set_invalid(i, buf);
diff --git a/src/test/regress/sql/conversion.sql b/src/test/regress/sql/conversion.sql
index 83d7105ac1e..c9a76cb014f 100644
--- a/src/test/regress/sql/conversion.sql
+++ b/src/test/regress/sql/conversion.sql
@@ -329,7 +329,6 @@ select description, inbytes, (test_conv(inbytes, 'iso8859-5', 'iso8859-5')).* fr
 -- Test conversions from ISO-8859-5
 select description, inbytes, (test_conv(inbytes, 'iso8859-5', 'utf8')).* from iso8859_5_inputs;
 select description, inbytes, (test_conv(inbytes, 'iso8859-5', 'koi8r')).* from iso8859_5_inputs;
-select description, inbytes, (test_conv(inbytes, 'iso8859_5', 'mule_internal')).* from iso8859_5_inputs;
 
 --
 -- Big5
@@ -346,29 +345,3 @@ insert into big5_inputs  values
 select description, inbytes, (test_conv(inbytes, 'big5', 'big5')).* from big5_inputs;
 -- Test conversions from Big5
 select description, inbytes, (test_conv(inbytes, 'big5', 'utf8')).* from big5_inputs;
-select description, inbytes, (test_conv(inbytes, 'big5', 'mule_internal')).* from big5_inputs;
-
---
--- MULE_INTERNAL
---
-CREATE TABLE mic_inputs (inbytes bytea, description text);
-insert into mic_inputs  values
-  ('\x666f6f',		'valid, pure ASCII'),
-  ('\x8bc68bcf8bcf',	'valid (in KOI8R)'),
-  ('\x8bc68bcf8b',	'invalid,incomplete char'),
-  ('\x92bedd',		'valid (in SHIFT_JIS)'),
-  ('\x92be',		'invalid, incomplete char)'),
-  ('\x666f6f95a3c1',	'valid (in Big5)'),
-  ('\x666f6f95a3',	'invalid, incomplete char'),
-  ('\x9200bedd',	'invalid, NUL byte'),
-  ('\x92bedd00',	'invalid, NUL byte'),
-  ('\x8b00c68bcf8bcf',	'invalid, NUL byte');
-
--- Test MULE_INTERNAL verification
-select description, inbytes, (test_conv(inbytes, 'mule_internal', 'mule_internal')).* from mic_inputs;
--- Test conversions from MULE_INTERNAL
-select description, inbytes, (test_conv(inbytes, 'mule_internal', 'koi8r')).* from mic_inputs;
-select description, inbytes, (test_conv(inbytes, 'mule_internal', 'iso8859-5')).* from mic_inputs;
-select description, inbytes, (test_conv(inbytes, 'mule_internal', 'sjis')).* from mic_inputs;
-select description, inbytes, (test_conv(inbytes, 'mule_internal', 'big5')).* from mic_inputs;
-select description, inbytes, (test_conv(inbytes, 'mule_internal', 'euc_jp')).* from mic_inputs;
diff --git a/src/test/regress/sql/encoding.sql b/src/test/regress/sql/encoding.sql
index b9543c0cb32..5e1fcb67a71 100644
--- a/src/test/regress/sql/encoding.sql
+++ b/src/test/regress/sql/encoding.sql
@@ -198,16 +198,7 @@ INSERT INTO encoding_tests VALUES
 	('UTF8',   '6 byte, unsupported', '\xfd8283'),
 	('UTF8',   '6 byte, unsupported', '\xfd828384'),
 	('UTF8',   '6 byte, unsupported', '\xfd82838485'),
-	('UTF8',   '6 byte, unsupported', '\xfd8283848586'),
-	-- MULE_INTERNAL
-	-- 2 81..8d LC1
-	-- 3 90..99 LC2
-	('MULE_INTERNAL', 'ASCII',         'a'),
-	('MULE_INTERNAL', 'LC1, short',    '\x81'),
-	('MULE_INTERNAL', 'LC1',           '\x8182'),
-	('MULE_INTERNAL', 'LC2, short',    '\x90'),
-	('MULE_INTERNAL', 'LC2, short',    '\x9082'),
-	('MULE_INTERNAL', 'LC2',           '\x908283');
+	('UTF8',   '6 byte, unsupported', '\xfd8283848586');
 
 SELECT COUNT(test_encoding(encoding, description, input)) > 0
 FROM encoding_tests;
diff --git a/src/test/regress/sql/object_address.sql b/src/test/regress/sql/object_address.sql
index 1a6c61f49d5..25d21c83145 100644
--- a/src/test/regress/sql/object_address.sql
+++ b/src/test/regress/sql/object_address.sql
@@ -176,7 +176,7 @@ WITH objects (type, name, args) AS (VALUES
     ('collation', '{default}', '{}'),
     ('table constraint', '{addr_nsp, gentable, a_chk}', '{}'),
     ('domain constraint', '{addr_nsp.gendomain}', '{domconstr}'),
-    ('conversion', '{pg_catalog, koi8_r_to_mic}', '{}'),
+    ('conversion', '{pg_catalog, koi8_r_to_utf8}', '{}'),
     ('default value', '{addr_nsp, gentable, b}', '{}'),
     ('language', '{plpgsql}', '{}'),
     -- large object
diff --git a/src/test/regress/sql/xml.sql b/src/test/regress/sql/xml.sql
index 0ea4f508837..a771a441c36 100644
--- a/src/test/regress/sql/xml.sql
+++ b/src/test/regress/sql/xml.sql
@@ -272,9 +272,7 @@ BEGIN
   END IF;
 EXCEPTION
   -- character with byte sequence 0xc2 0xb0 in encoding "UTF8" has no equivalent in encoding "LATIN8"
-  WHEN untranslatable_character
-  -- default conversion function for encoding "UTF8" to "MULE_INTERNAL" does not exist
-  OR undefined_function
+  WHEN undefined_function
   -- unsupported XML feature
   OR feature_not_supported THEN
     RAISE LOG 'skip: %', SQLERRM;
-- 
2.50.1 (Apple Git-155)

