From 121baa411ea71fc411037b456f84e81d2dd26a10 Mon Sep 17 00:00:00 2001
From: Andrew Kane <andrew@ankane.org>
Date: Sun, 26 Mar 2023 12:45:44 -0700
Subject: [PATCH] Added debug message for index scan

---
 src/ivfscan.c | 10 ++++++++++
 1 file changed, 10 insertions(+)

diff --git a/src/ivfscan.c b/src/ivfscan.c
index 85e7f08..ce53053 100644
--- a/src/ivfscan.c
+++ b/src/ivfscan.c
@@ -111,6 +111,7 @@ GetScanItems(IndexScanDesc scan, Datum value)
 	Datum		datum;
 	bool		isnull;
 	TupleDesc	tupdesc = RelationGetDescr(scan->indexRelation);
+	double		tuples = 0;
 
 #if PG_VERSION_NUM >= 120000
 	TupleTableSlot *slot = MakeSingleTupleTableSlot(so->tupdesc, &TTSOpsVirtual);
@@ -159,6 +160,8 @@ GetScanItems(IndexScanDesc scan, Datum value)
 				ExecStoreVirtualTuple(slot);
 
 				tuplesort_puttupleslot(so->sortstate, slot);
+
+				tuples++;
 			}
 
 			searchPage = IvfflatPageGetOpaque(page)->nextblkno;
@@ -167,6 +170,13 @@ GetScanItems(IndexScanDesc scan, Datum value)
 		}
 	}
 
+	/* TODO Scan more lists */
+	if (tuples < 100)
+		ereport(DEBUG1,
+				(errmsg("index scan found few tuples"),
+				 errdetail("index may have been created without data or lists is too high"),
+				 errhint("recreate the index and possibly decrease lists")));
+
 	tuplesort_performsort(so->sortstate);
 }