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Avoid O(N^2) overhead in repeated nocachegetattr calls when columns of

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a tuple are being accessed via ExecEvalVar and the attcacheoff shortcut
isn't usable (due to nulls and/or varlena columns).  To do this, cache
Datums extracted from a tuple in the associated TupleTableSlot.
Also some code cleanup in and around the TupleTable handling.
Atsushi Ogawa with some kibitzing by Tom Lane.
This commit is contained in:
Tom Lane
2005-03-14 04:41:13 +00:00
parent d1022ce3a1
commit a9b05bdc83
8 changed files with 378 additions and 300 deletions

7
src/include/executor/executor.h

@ -7,7 +7,7 @@
* Portions Copyright (c) 1996-2005, PostgreSQL Global Development Group
* Portions Copyright (c) 1994, Regents of the University of California
*
* $PostgreSQL: pgsql/src/include/executor/executor.h,v 1.115 2004/12/31 22:03:29 pgsql Exp $
* $PostgreSQL: pgsql/src/include/executor/executor.h,v 1.116 2005/03/14 04:41:13 tgl Exp $
*
*-------------------------------------------------------------------------
*/
@ -158,10 +158,10 @@ extern void ExecAssignScanProjectionInfo(ScanState *node);
/*
* prototypes from functions in execTuples.c
*/
extern TupleTable ExecCreateTupleTable(int initialSize);
extern TupleTable ExecCreateTupleTable(int tableSize);
extern void ExecDropTupleTable(TupleTable table, bool shouldFree);
extern TupleTableSlot *ExecAllocTableSlot(TupleTable table);
extern TupleTableSlot *MakeTupleTableSlot(void);
extern TupleTableSlot *ExecAllocTableSlot(TupleTable table);
extern TupleTableSlot *ExecStoreTuple(HeapTuple tuple,
TupleTableSlot *slot,
Buffer buffer,
@ -169,7 +169,6 @@ extern TupleTableSlot *ExecStoreTuple(HeapTuple tuple,
extern TupleTableSlot *ExecClearTuple(TupleTableSlot *slot);
extern void ExecSetSlotDescriptor(TupleTableSlot *slot,
TupleDesc tupdesc, bool shouldFree);
extern void ExecSetSlotDescriptorIsNew(TupleTableSlot *slot, bool isNew);
extern void ExecInitResultTupleSlot(EState *estate, PlanState *planstate);
extern void ExecInitScanTupleSlot(EState *estate, ScanState *scanstate);
extern TupleTableSlot *ExecInitExtraTupleSlot(EState *estate);