It's surprising that nobody noticed the bug until now. It seems it has been there since 7.3 days. I would like to make a back patch for 7.3-stable if nobody objects.
It's my bug :( -- sorry about that. Here's a 7.3 patch per Tom's nearby advice. I'll apply if you'd like.
Joe
Index: src/backend/utils/adt/varlena.c
===================================================================
RCS file: /cvsroot/pgsql-server/src/backend/utils/adt/varlena.c,v
retrieving revision 1.92.2.2
diff -c -r1.92.2.2 varlena.c
*** src/backend/utils/adt/varlena.c 30 Nov 2003 20:52:37 -0000 1.92.2.2
--- src/backend/utils/adt/varlena.c 31 Jan 2004 16:50:37 -0000
***************
*** 665,673 ****
len1 = (VARSIZE(t1) - VARHDRSZ);
len2 = (VARSIZE(t2) - VARHDRSZ);
- /* no use in searching str past point where search_str will fit */
- px = (len1 - len2);
-
if (eml == 1) /* simple case - single byte encoding
*/
{
char *p1,
--- 665,670 ----
***************
*** 676,681 ****
--- 673,681 ----
p1 = VARDATA(t1);
p2 = VARDATA(t2);
+ /* no use in searching str past point where search_str will fit */
+ px = (len1 - len2);
+
for (p = 0; p <= px; p++)
{
if ((*p2 == *p1) && (strncmp(p1, p2, len2) == 0))
***************
*** 702,707 ****
--- 702,710 ----
ps2 = p2 = (pg_wchar *) palloc((len2 + 1) * sizeof(pg_wchar));
(void) pg_mb2wchar_with_len((unsigned char *) VARDATA(t2), p2, len2);
len2 = pg_wchar_strlen(p2);
+
+ /* no use in searching str past point where search_str will fit */
+ px = (len1 - len2);
for (p = 0; p <= px; p++)
{
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