diff -Naur postgresql-8.0.0rc5/src/backend/parser/scansup.c postgresql-8.0.0rc5-new/src/backend/parser/scansup.c
--- postgresql-8.0.0rc5/src/backend/parser/scansup.c	Fri Dec 31 17:00:27 2004
+++ postgresql-8.0.0rc5-new/src/backend/parser/scansup.c	Fri Jan 14 13:44:05 2005
@@ -21,6 +21,7 @@
 #include "parser/scansup.h"
 #include "mb/pg_wchar.h"
 
+bool parser_ignore_case = true;
 
 /* ----------------
  *		scanstr
@@ -147,10 +148,11 @@
 	{
 		unsigned char ch = (unsigned char) ident[i];
 
-		if (ch >= 'A' && ch <= 'Z')
-			ch += 'a' - 'A';
-		else if (ch >= 0x80 && isupper(ch))
-			ch = tolower(ch);
+		if (parser_ignore_case)
+			if (ch >= 'A' && ch <= 'Z')
+				ch += 'a' - 'A';
+			else if (ch >= 0x80 && isupper(ch))
+				ch = tolower(ch);
 		result[i] = (char) ch;
 	}
 	result[i] = '\0';
diff -Naur postgresql-8.0.0rc5/src/backend/utils/misc/guc.c postgresql-8.0.0rc5-new/src/backend/utils/misc/guc.c
--- postgresql-8.0.0rc5/src/backend/utils/misc/guc.c	Sat Jan  1 00:43:08 2005
+++ postgresql-8.0.0rc5-new/src/backend/utils/misc/guc.c	Fri Jan 14 13:43:35 2005
@@ -44,6 +44,7 @@
 #include "optimizer/prep.h"
 #include "parser/parse_expr.h"
 #include "parser/parse_relation.h"
+#include "parser/scansup.h"
 #include "postmaster/bgwriter.h"
 #include "postmaster/syslogger.h"
 #include "postmaster/postmaster.h"
@@ -849,6 +850,15 @@
 #else
 		false, NULL, NULL
 #endif
+	},
+	{
+		{"parser_ignore_case", PGC_USERSET, CUSTOM_OPTIONS,
+			gettext_noop("Ignore case of unquoted identifiers"),
+			NULL,
+			GUC_NOT_IN_SAMPLE
+		},
+		&parser_ignore_case,
+		true, NULL, NULL
 	},
 
 	/* End-of-list marker */
diff -Naur postgresql-8.0.0rc5/src/bin/psql/tab-complete.c postgresql-8.0.0rc5-new/src/bin/psql/tab-complete.c
--- postgresql-8.0.0rc5/src/bin/psql/tab-complete.c	Sat Jan  1 00:43:08 2005
+++ postgresql-8.0.0rc5-new/src/bin/psql/tab-complete.c	Fri Jan 14 13:38:52 2005
@@ -575,6 +575,7 @@
 		"max_locks_per_transaction",
 		"max_stack_depth",
 		"password_encryption",
+		"parser_ignore_case",
 		"port",
 		"random_page_cost",
 		"regex_flavor",
diff -Naur postgresql-8.0.0rc5/src/include/parser/scansup.h postgresql-8.0.0rc5-new/src/include/parser/scansup.h
--- postgresql-8.0.0rc5/src/include/parser/scansup.h	Fri Dec 31 17:03:38 2004
+++ postgresql-8.0.0rc5-new/src/include/parser/scansup.h	Fri Jan 14 13:32:07 2005
@@ -15,6 +15,8 @@
 #ifndef SCANSUP_H
 #define SCANSUP_H
 
+extern bool parser_ignore_case;
+
 extern char *scanstr(const char *s);
 
 extern char *downcase_truncate_identifier(const char *ident, int len,