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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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src/include/nodes/execnodes.h
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@@ -1260,6 +1260,7 @@ typedef struct IndexScanState
* RelationDesc index relation descriptor
* ScanDesc index scan descriptor
* VMBuffer buffer in use for visibility map testing, if any
* HeapFetches number of tuples we were forced to fetch from heap
* ----------------
*/
typedef struct IndexOnlyScanState
@@ -1277,6 +1278,7 @@ typedef struct IndexOnlyScanState
Relation ioss_RelationDesc;
IndexScanDesc ioss_ScanDesc;
Buffer ioss_VMBuffer;
long ioss_HeapFetches;
} IndexOnlyScanState;
/* ----------------