v2-0001-Fix-arrays-comparison-in-CompareOpclassOptions.patch

From 41b35d6ef50148d0e12cd3093b6d54f043ac5b6e Mon Sep 17 00:00:00 2001
From: Alexander Korotkov <akorotkov@postgresql.org>
Date: Fri, 8 Nov 2024 00:23:00 +0200
Subject: [PATCH v2] Fix arrays comparison in CompareOpclassOptions()

The current code calls array_eq() and does not provide FmgrInfo.  This commit
provides initialization of FmgrInfo and uses C collation as the safe option
for text comparison because we don't know anything about the semantics of
opclass options.

Backpatch to 13, where opclass options were introduced.

Reported-by: Nicolas Maus
Discussion: https://postgr.es/m/18692-72ea398df3ec6712%40postgresql.org
Backpatch-through: 13
---
 contrib/pg_trgm/expected/pg_trgm.out |  3 +++
 contrib/pg_trgm/sql/pg_trgm.sql      |  4 ++++
 src/backend/commands/indexcmds.c     | 11 +++++++++--
 3 files changed, 16 insertions(+), 2 deletions(-)

diff --git a/contrib/pg_trgm/expected/pg_trgm.out b/contrib/pg_trgm/expected/pg_trgm.out
index ce4bf1d4e51..0b70d9de256 100644
--- a/contrib/pg_trgm/expected/pg_trgm.out
+++ b/contrib/pg_trgm/expected/pg_trgm.out
@@ -2372,6 +2372,9 @@ ERROR:  value 2025 out of bounds for option "siglen"
 DETAIL:  Valid values are between "1" and "2024".
 create index trgm_idx on test_trgm using gist (t gist_trgm_ops(siglen=2024));
 set enable_seqscan=off;
+-- check index compatibility handling when opclass option is specified
+alter table test_trgm alter column t type varchar(768);
+alter table test_trgm alter column t type text;
 select t,similarity(t,'qwertyu0988') as sml from test_trgm where t % 'qwertyu0988' order by sml desc, t;
       t      |   sml    
 -------------+----------
diff --git a/contrib/pg_trgm/sql/pg_trgm.sql b/contrib/pg_trgm/sql/pg_trgm.sql
index 6a9da24d5a7..340c9891899 100644
--- a/contrib/pg_trgm/sql/pg_trgm.sql
+++ b/contrib/pg_trgm/sql/pg_trgm.sql
@@ -52,6 +52,10 @@ create index trgm_idx on test_trgm using gist (t gist_trgm_ops(siglen=2025));
 create index trgm_idx on test_trgm using gist (t gist_trgm_ops(siglen=2024));
 set enable_seqscan=off;
 
+-- check index compatibility handling when opclass option is specified
+alter table test_trgm alter column t type varchar(768);
+alter table test_trgm alter column t type text;
+
 select t,similarity(t,'qwertyu0988') as sml from test_trgm where t % 'qwertyu0988' order by sml desc, t;
 select t,similarity(t,'gwertyu0988') as sml from test_trgm where t % 'gwertyu0988' order by sml desc, t;
 select t,similarity(t,'gwertyu1988') as sml from test_trgm where t % 'gwertyu1988' order by sml desc, t;
diff --git a/src/backend/commands/indexcmds.c b/src/backend/commands/indexcmds.c
index 2f652463e3c..d1134733c17 100644
--- a/src/backend/commands/indexcmds.c
+++ b/src/backend/commands/indexcmds.c
@@ -29,6 +29,7 @@
 #include "catalog/namespace.h"
 #include "catalog/pg_am.h"
 #include "catalog/pg_authid.h"
+#include "catalog/pg_collation.h"
 #include "catalog/pg_constraint.h"
 #include "catalog/pg_database.h"
 #include "catalog/pg_inherits.h"
@@ -362,10 +363,12 @@ static bool
 CompareOpclassOptions(const Datum *opts1, const Datum *opts2, int natts)
 {
 	int			i;
+	FmgrInfo	fm;
 
 	if (!opts1 && !opts2)
 		return true;
 
+	fmgr_info(F_ARRAY_EQ, &fm);
 	for (i = 0; i < natts; i++)
 	{
 		Datum		opt1 = opts1 ? opts1[i] : (Datum) 0;
@@ -381,8 +384,12 @@ CompareOpclassOptions(const Datum *opts1, const Datum *opts2, int natts)
 		else if (opt2 == (Datum) 0)
 			return false;
 
-		/* Compare non-NULL text[] datums. */
-		if (!DatumGetBool(DirectFunctionCall2(array_eq, opt1, opt2)))
+		/*
+		 * Compare non-NULL text[] datums.  Use C collation to enforce binary
+		 * equivalence of texts, because we don't know anything about the
+		 * semantics of opclass options.
+		 */
+		if (!DatumGetBool(FunctionCall2Coll(&fm, C_COLLATION_OID, opt1, opt2)))
 			return false;
 	}
 
-- 
2.39.5 (Apple Git-154)