*** ./src/backend/parser/scan.l.orig	2004-02-02 12:25:04.000000000 +0200
--- ./src/backend/parser/scan.l	2004-02-03 14:10:55.000000000 +0200
***************
*** 549,560 ****
  					 * Note: here we use a locale-dependent case conversion,
  					 * which seems appropriate under standard SQL rules, whereas
  					 * the keyword comparison was NOT locale-dependent.
  					 */
  					ident = pstrdup(yytext);
  					for (i = 0; ident[i]; i++)
  					{
  						if (isupper((unsigned char) ident[i]))
! 							ident[i] = tolower((unsigned char) ident[i]);
  					}
  					if (i >= NAMEDATALEN)
                      {
--- 549,573 ----
  					 * Note: here we use a locale-dependent case conversion,
  					 * which seems appropriate under standard SQL rules, whereas
  					 * the keyword comparison was NOT locale-dependent.
+ 					 *
+ 					 * Note: locale-dependent causes incorrect downcasting
+ 					 * of capital 'I' if used with tr_TR locale. Instead
+ 					 * of being converting to 'i' it gets converted to '\xfd'
+ 					 * or <U0131> in Unicode which, according to
+ 					 * /usr/share/i18n/charmaps/ISO-8859-9.gz
+ 					 * stands for "LATIN SMALL LETTER DOTLESS I" .
+ 					 * To prevent this, a special case is introduced.
  					 */
  					ident = pstrdup(yytext);
  					for (i = 0; ident[i]; i++)
  					{
  						if (isupper((unsigned char) ident[i]))
! 						{
! 							if (ident[i] == 'I')
! 								ident[i] = 'i';
! 							else
! 								ident[i] = tolower((unsigned char) ident[i]);
! 						}
  					}
  					if (i >= NAMEDATALEN)
                      {