v1-0001-Fix-incorrect-assignment-of-InvalidXLogRecPtr-to-.patch

From 319d5dae6f073c3e1ecea79d51aefdad6ecaa884 Mon Sep 17 00:00:00 2001
From: Fujii Masao <fujii@postgresql.org>
Date: Wed, 12 Nov 2025 17:10:35 +0900
Subject: [PATCH v1] Fix incorrect assignment of InvalidXLogRecPtr to a non-LSN
 variable.

pg_logical_slot_get_changes_guts() previously assigned InvalidXLogRecPtr to
the local variable upto_nchanges, which is of type int32, not XLogRecPtr.
While this caused no functional issue since InvalidXLogRecPtr is defined as 0,
it was semantically incorrect.

This commit fixes the issue by updating pg_logical_slot_get_changes_guts()
to set upto_nchanges to 0 instead of InvalidXLogRecPtr.

No backpatch is needed, as the previous behavior was harmless.
---
 src/backend/replication/logical/logicalfuncs.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/backend/replication/logical/logicalfuncs.c b/src/backend/replication/logical/logicalfuncs.c
index 49b2aef3c74..25b2b795925 100644
--- a/src/backend/replication/logical/logicalfuncs.c
+++ b/src/backend/replication/logical/logicalfuncs.c
@@ -129,7 +129,7 @@ pg_logical_slot_get_changes_guts(FunctionCallInfo fcinfo, bool confirm, bool bin
 		upto_lsn = PG_GETARG_LSN(1);
 
 	if (PG_ARGISNULL(2))
-		upto_nchanges = InvalidXLogRecPtr;
+		upto_nchanges = 0;
 	else
 		upto_nchanges = PG_GETARG_INT32(2);
 
-- 
2.51.2