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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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2
src/backend/executor/nodeIndexonlyscan.c
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@ -90,6 +90,7 @@ IndexOnlyNext(IndexOnlyScanState *node)
/*
* Rats, we have to visit the heap to check visibility.
*/
node->ioss_HeapFetches++;
tuple = index_fetch_heap(scandesc);
if (tuple == NULL)
continue; /* no visible tuple, try next index entry */
@ -346,6 +347,7 @@ ExecInitIndexOnlyScan(IndexOnlyScan *node, EState *estate, int eflags)
indexstate = makeNode(IndexOnlyScanState);
indexstate->ss.ps.plan = (Plan *) node;
indexstate->ss.ps.state = estate;
indexstate->ioss_HeapFetches = 0;
/*
* Miscellaneous initialization