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Instrument index-only scans to count heap fetches performed.

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Patch by me; review by Tom Lane, Jeff Davis, and Peter Geoghegan.
This commit is contained in:
Robert Haas
2012-01-25 20:40:34 -05:00
parent 08146775ac
commit 9f9135d129
3 changed files with 7 additions and 0 deletions
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3
src/backend/commands/explain.c
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@ -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,