Subject: [PATCH] Turn protective Assert() into elog(ERROR)

From: Álvaro Herrera <[email-masked]>
Date: Fri, 1 May 2026 09:23:09 +0200

---
 src/backend/access/index/genam.c | 10 ++++++----
 1 file changed, 6 insertions(+), 4 deletions(-)

diff --git a/src/backend/access/index/genam.c b/src/backend/access/index/genam.c
index 97d44b84622..7d401e3f137 100644
--- a/src/backend/access/index/genam.c
+++ b/src/backend/access/index/genam.c
@@ -396,11 +396,13 @@ systable_beginscan(Relation heapRelation,
 
 	/*
 	 * If this backend promised that it won't access shared catalogs during
-	 * logical decoding, this it the right place to verify.
+	 * logical decoding, this is the right place to verify.
 	 */
-	Assert(!HistoricSnapshotActive() ||
-		   accessSharedCatalogsInDecoding ||
-		   !heapRelation->rd_rel->relisshared);
+	if (HistoricSnapshotActive() &&
+		!accessSharedCatalogsInDecoding &&
+		heapRelation->rd_rel->relisshared)
+		elog(ERROR,
+			 "cannot access shared catalog with database-specific historic snapshot");
 
 	if (indexOK &&
 		!IgnoreSystemIndexes &&
-- 
2.47.3

--k6vxbflu22czkb7a--