From 9f9135d129e915e72c8a2f770689fd72619ead49 Mon Sep 17 00:00:00 2001
From: Robert Haas <rhaas@postgresql.org>
Date: Wed, 25 Jan 2012 20:40:34 -0500
Subject: Instrument index-only scans to count heap fetches performed.

Patch by me; review by Tom Lane, Jeff Davis, and Peter Geoghegan.
---
 src/backend/commands/explain.c | 3 +++
 1 file changed, 3 insertions(+)

(limited to 'src/backend/commands/explain.c')

diff --git a/src/backend/commands/explain.c b/src/backend/commands/explain.c
index 8b48105974f..e297e9cfb90 100644
--- a/src/backend/commands/explain.c
+++ b/src/backend/commands/explain.c
@@ -1012,6 +1012,9 @@ ExplainNode(PlanState *planstate, List *ancestors,
 			if (plan->qual)
 				show_instrumentation_count("Rows Removed by Filter", 1,
 										   planstate, es);
+			if (es->analyze)
+				ExplainPropertyLong("Heap Fetches",
+					((IndexOnlyScanState *) planstate)->ioss_HeapFetches, es);
 			break;
 		case T_BitmapIndexScan:
 			show_scan_qual(((BitmapIndexScan *) plan)->indexqualorig,
-- 
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