From ecddde963a012b973458ca9391ba79ecf7894771 Mon Sep 17 00:00:00 2001
From: Andrew Kane <andrew@ankane.org>
Date: Tue, 30 Jun 2026 01:15:38 -0700
Subject: [PATCH] Added check to confirm in deletion list before marking as
 deleted

---
 src/hnswvacuum.c | 13 +++++++++++++
 1 file changed, 13 insertions(+)

diff --git a/src/hnswvacuum.c b/src/hnswvacuum.c
index 3952c57..5f84fb6 100644
--- a/src/hnswvacuum.c
+++ b/src/hnswvacuum.c
@@ -637,6 +637,7 @@ MarkDeleted(HnswVacuumState * vacuumstate)
 			Page		npage;
 			BlockNumber neighborPage;
 			OffsetNumber neighborOffno;
+			ItemPointerData indextid;
 
 			/* Skip neighbor tuples */
 			if (!HnswIsElementTuple(etup))
@@ -656,6 +657,18 @@ MarkDeleted(HnswVacuumState * vacuumstate)
 			if (ItemPointerIsValid(&etup->heaptids[0]))
 				continue;
 
+			/* Confirm in deletion list */
+			ItemPointerSet(&indextid, blkno, offno);
+			if (!DeletingElement(vacuumstate->deleting, &indextid))
+			{
+				/*
+				 * Should not happen, but skip if it does since there may be
+				 * connections from other elements
+				 */
+				elog(INFO, "hnsw element not in deletion list");
+				continue;
+			}
+
 			/* Get neighbor page */
 			neighborPage = ItemPointerGetBlockNumber(&etup->neighbortid);
 			neighborOffno = ItemPointerGetOffsetNumber(&etup->neighbortid);