From 418989a5ce01f7afa2d587a8a13bb8300de6022e Mon Sep 17 00:00:00 2001 From: Tom Lane Date: Thu, 13 Mar 2008 18:32:09 +0000 Subject: [PATCH] Fix varstr_cmp's special case for UTF8 encoding on Windows so that strings that are reported as "equal" by wcscoll() are checked to see if they really are bitwise equal, and are sorted per strcmp() if not. We made this happen a couple of years ago in the regular code path, but it unaccountably got left out of the Windows/UTF8 case (probably brain fade on my part at the time). As in the prior set of changes, affected users may need to reindex indexes on textual columns. Backpatch as far as 8.2, which is the oldest release we are still supporting on Windows. --- src/backend/utils/adt/varlena.c | 13 +++++++++++++ 1 file changed, 13 insertions(+) diff --git a/src/backend/utils/adt/varlena.c b/src/backend/utils/adt/varlena.c index 5fcce7477f..327d62d7cb 100644 --- a/src/backend/utils/adt/varlena.c +++ b/src/backend/utils/adt/varlena.c @@ -1003,6 +1003,19 @@ varstr_cmp(char *arg1, int len1, char *arg2, int len2) ereport(ERROR, (errmsg("could not compare Unicode strings: %m"))); + /* + * In some locales wcscoll() can claim that nonidentical strings + * are equal. Believing that would be bad news for a number of + * reasons, so we follow Perl's lead and sort "equal" strings + * according to strcmp (on the UTF-8 representation). + */ + if (result == 0) + { + result = strncmp(arg1, arg2, Min(len1, len2)); + if ((result == 0) && (len1 != len2)) + result = (len1 < len2) ? -1 : 1; + } + if (a1p != a1buf) pfree(a1p); if (a2p != a2buf) -- 2.39.5