From 87fe23d9ec73a2da7d3f58c445c4e875c1e73ea3 Mon Sep 17 00:00:00 2001
From: Andrew Kane <andrew@ankane.org>
Date: Tue, 19 Dec 2023 13:55:56 -0500
Subject: [PATCH] Added code for Postgres < 11.8

---
 src/hnswbuild.c | 14 ++++++++++++++
 1 file changed, 14 insertions(+)

diff --git a/src/hnswbuild.c b/src/hnswbuild.c
index c2d0c97..cdfb62c 100644
--- a/src/hnswbuild.c
+++ b/src/hnswbuild.c
@@ -888,7 +888,21 @@ BuildIndex(Relation heap, Relation index, IndexInfo *indexInfo,
 		FlushPages(buildstate);
 
 	if (RelationNeedsWAL(index))
+	{
+#if PG_VERSION_NUM >= 110008
 		log_newpage_range(index, MAIN_FORKNUM, 0, RelationGetNumberOfBlocks(index), true);
+#else
+		for (BlockNumber blkno = 0; blkno < RelationGetNumberOfBlocksInFork(index, forkNum); blkno++)
+		{
+			Buffer		buf = ReadBufferExtended(index, forkNum, blkno, RBM_NORMAL, NULL);
+
+			LockBuffer(buf, BUFFER_LOCK_EXCLUSIVE);
+			MarkBufferDirty(buf);
+			log_newpage_buffer(buf, true);
+			UnlockReleaseBuffer(buf);
+		}
+#endif
+	}
 
 	FreeBuildState(buildstate);
 }