pg_dump(all) --quote-all-identifiers

diff --git a/src/backend/utils/adt/ruleutils.c b/src/backend/utils/adt/ruleutils.c
index b85eefa..278e105 100644
--- a/src/backend/utils/adt/ruleutils.c
+++ b/src/backend/utils/adt/ruleutils.c
@@ -125,6 +125,7 @@ static SPIPlanPtr plan_getrulebyoid = NULL;
 static const char *query_getrulebyoid = "SELECT * FROM pg_catalog.pg_rewrite WHERE oid = $1";
 static SPIPlanPtr plan_getviewrule = NULL;
 static const char *query_getviewrule = "SELECT * FROM pg_catalog.pg_rewrite WHERE ev_class = $1 AND rulename = $2";
+bool quote_all_identifiers;
 
 
 /* ----------
@@ -6473,6 +6474,9 @@ quote_identifier(const char *ident)
 		}
 	}
 
+	if (quote_all_identifiers)
+		safe = false;
+
 	if (safe)
 	{
 		/*
diff --git a/src/backend/utils/misc/guc.c b/src/backend/utils/misc/guc.c
index 6597e18..bf16e03 100644
--- a/src/backend/utils/misc/guc.c
+++ b/src/backend/utils/misc/guc.c
@@ -1261,6 +1261,15 @@ static struct config_bool ConfigureNamesBool[] =
 		false, NULL, NULL
 	},
 
+	{
+		{"quote_all_identifiers", PGC_USERSET, COMPAT_OPTIONS,
+			gettext_noop("When generating SQL fragments, quote all identifiers."),
+			NULL,
+		},
+		&quote_all_identifiers,
+		false, NULL, NULL
+	},
+
 	/* End-of-list marker */
 	{
 		{NULL, 0, 0, NULL, NULL}, NULL, false, NULL, NULL
diff --git a/src/bin/pg_dump/dumputils.c b/src/bin/pg_dump/dumputils.c
index 4c5f9a5..3d26185 100644
--- a/src/bin/pg_dump/dumputils.c
+++ b/src/bin/pg_dump/dumputils.c
@@ -36,6 +36,8 @@ static bool parallel_init_done = false;
 static DWORD tls_index;
 #endif
 
+int quote_all_identifiers;
+
 void
 init_parallel_dump_utils(void)
 {
@@ -102,8 +104,10 @@ fmtId(const char *rawid)
 	 * These checks need to match the identifier production in scan.l. Don't
 	 * use islower() etc.
 	 */
+	if (quote_all_identifiers)
+		need_quotes = true;
 	/* slightly different rules for first character */
-	if (!((rawid[0] >= 'a' && rawid[0] <= 'z') || rawid[0] == '_'))
+	else if (!((rawid[0] >= 'a' && rawid[0] <= 'z') || rawid[0] == '_'))
 		need_quotes = true;
 	else
 	{
diff --git a/src/bin/pg_dump/dumputils.h b/src/bin/pg_dump/dumputils.h
index 6762839..77d05d0 100644
--- a/src/bin/pg_dump/dumputils.h
+++ b/src/bin/pg_dump/dumputils.h
@@ -46,4 +46,6 @@ extern bool processSQLNamePattern(PGconn *conn, PQExpBuffer buf,
 					  const char *schemavar, const char *namevar,
 					  const char *altnamevar, const char *visibilityrule);
 
+extern int quote_all_identifiers;
+
 #endif   /* DUMPUTILS_H */
diff --git a/src/bin/pg_dump/pg_dump.c b/src/bin/pg_dump/pg_dump.c
index 1c4867d..471a246 100644
--- a/src/bin/pg_dump/pg_dump.c
+++ b/src/bin/pg_dump/pg_dump.c
@@ -297,6 +297,7 @@ main(int argc, char **argv)
 		{"inserts", no_argument, &dump_inserts, 1},
 		{"lock-wait-timeout", required_argument, NULL, 2},
 		{"no-tablespaces", no_argument, &outputNoTablespaces, 1},
+		{"quote-all-identifiers", no_argument, &quote_all_identifiers, 1},
 		{"role", required_argument, NULL, 3},
 		{"use-set-session-authorization", no_argument, &use_setsessauth, 1},
 
@@ -635,6 +636,12 @@ main(int argc, char **argv)
 		do_sql_command(g_conn, "SET statement_timeout = 0");
 
 	/*
+	 * Quote all identifiers, if requested.
+	 */
+	if (quote_all_identifiers && g_fout->remoteVersion >= 90000)
+		do_sql_command(g_conn, "SET quote_all_identifiers = true");
+
+	/*
 	 * Start serializable transaction to dump consistent data.
 	 */
 	do_sql_command(g_conn, "BEGIN");
diff --git a/src/bin/pg_dump/pg_dumpall.c b/src/bin/pg_dump/pg_dumpall.c
index 0c3f63f..e0f0607 100644
--- a/src/bin/pg_dump/pg_dumpall.c
+++ b/src/bin/pg_dump/pg_dumpall.c
@@ -130,6 +130,7 @@ main(int argc, char *argv[])
 		{"inserts", no_argument, &inserts, 1},
 		{"lock-wait-timeout", required_argument, NULL, 2},
 		{"no-tablespaces", no_argument, &no_tablespaces, 1},
+		{"quote-all-identifiers", no_argument, &quote_all_identifiers, 1},
 		{"role", required_argument, NULL, 3},
 		{"use-set-session-authorization", no_argument, &use_setsessauth, 1},
 
@@ -328,6 +329,8 @@ main(int argc, char *argv[])
 		appendPQExpBuffer(pgdumpopts, " --inserts");
 	if (no_tablespaces)
 		appendPQExpBuffer(pgdumpopts, " --no-tablespaces");
+	if (quote_all_identifiers)
+		appendPQExpBuffer(pgdumpopts, " --quote-all-identifiers");
 	if (use_setsessauth)
 		appendPQExpBuffer(pgdumpopts, " --use-set-session-authorization");
 
@@ -440,6 +443,12 @@ main(int argc, char *argv[])
 		destroyPQExpBuffer(query);
 	}
 
+	/* Force quoting of all identifiers if requested. */
+	if (quote_all_identifiers && server_version >= 90000)
+	{
+		executeCommand(conn, "SET quote_all_identifiers = true");
+	}
+
 	fprintf(OPF, "--\n-- PostgreSQL database cluster dump\n--\n\n");
 	if (verbose)
 		dumpTimestamp("Started on");
diff --git a/src/include/utils/builtins.h b/src/include/utils/builtins.h
index ed64ebc..05bd5d8 100644
--- a/src/include/utils/builtins.h
+++ b/src/include/utils/builtins.h
@@ -583,6 +583,7 @@ extern Datum record_ge(PG_FUNCTION_ARGS);
 extern Datum btrecordcmp(PG_FUNCTION_ARGS);
 
 /* ruleutils.c */
+extern bool quote_all_identifiers;
 extern Datum pg_get_ruledef(PG_FUNCTION_ARGS);
 extern Datum pg_get_ruledef_ext(PG_FUNCTION_ARGS);
 extern Datum pg_get_viewdef(PG_FUNCTION_ARGS);