From fe6dcbdecf93b9de04a456438751711d8815e469 Mon Sep 17 00:00:00 2001
From: Konstantin Knizhnik <knizhnik@neon.tech>
Date: Thu, 19 Jun 2025 14:44:22 +0300
Subject: [PATCH] Switch on DEBUG_COMPARE_LOCAL mode

---
 pgxn/neon/pagestore_smgr.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/pgxn/neon/pagestore_smgr.c b/pgxn/neon/pagestore_smgr.c
index 43fd715bbb..fe9423b3cf 100644
--- a/pgxn/neon/pagestore_smgr.c
+++ b/pgxn/neon/pagestore_smgr.c
@@ -82,7 +82,7 @@ typedef PGAlignedBlock PGIOAlignedBlock;
  * read, compare the versions we read from local disk and Page Server,
  * and Assert that they are identical.
  */
-/* #define DEBUG_COMPARE_LOCAL */
+#define DEBUG_COMPARE_LOCAL
 
 #ifdef DEBUG_COMPARE_LOCAL
 #include "access/nbtree.h"
@@ -1519,6 +1519,8 @@ neon_readv(SMgrRelation reln, ForkNumber forknum, BlockNumber blocknum,
 #ifdef DEBUG_COMPARE_LOCAL
 	compare_with_localv(reln, forknum, blocknum, buffers, nblocks, request_lsns, read_pages);
 	memset(read_pages, 0, sizeof(read_pages));
+	if (prefetch_result == nblocks)
+		neon_log(DEBUG5, "Prefetch hit");
 #else
 	if (prefetch_result == nblocks)
 		return;