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| author | Tom Lane <tgl@sss.pgh.pa.us> | 2003-02-03 15:07:08 +0000 |
|---|---|---|
| committer | Tom Lane <tgl@sss.pgh.pa.us> | 2003-02-03 15:07:08 +0000 |
| commit | 4cff59d8d540c441fb0c22dfaa517bc25aa5f794 (patch) | |
| tree | 88b4c216d219582904d3d9d6a236bb9468fe148c /src/include/executor/executor.h | |
| parent | 0d3e36b6687ae601551fb8047c10a68f2d6fb565 (diff) | |
| download | postgresql-4cff59d8d540c441fb0c22dfaa517bc25aa5f794.tar.gz postgresql-4cff59d8d540c441fb0c22dfaa517bc25aa5f794.zip | |
Tweak planner and executor to avoid doing ExecProject() in table scan
nodes where it's not really necessary. In many cases where the scan node
is not the topmost plan node (eg, joins, aggregation), it's possible to
just return the table tuple directly instead of generating an intermediate
projection tuple. In preliminary testing, this reduced the CPU time
needed for 'SELECT COUNT(*) FROM foo' by about 10%.
Diffstat (limited to 'src/include/executor/executor.h')
| -rw-r--r-- | src/include/executor/executor.h | 3 |
1 files changed, 2 insertions, 1 deletions
diff --git a/src/include/executor/executor.h b/src/include/executor/executor.h index cd462ac27a0..2f329ca57af 100644 --- a/src/include/executor/executor.h +++ b/src/include/executor/executor.h @@ -7,7 +7,7 @@ * Portions Copyright (c) 1996-2002, PostgreSQL Global Development Group * Portions Copyright (c) 1994, Regents of the University of California * - * $Id: executor.h,v 1.87 2003/01/12 04:03:34 tgl Exp $ + * $Id: executor.h,v 1.88 2003/02/03 15:07:07 tgl Exp $ * *------------------------------------------------------------------------- */ @@ -137,6 +137,7 @@ extern TupleTableSlot *ExecProject(ProjectionInfo *projInfo, typedef TupleTableSlot *(*ExecScanAccessMtd) (ScanState *node); extern TupleTableSlot *ExecScan(ScanState *node, ExecScanAccessMtd accessMtd); +extern void ExecAssignScanProjectionInfo(ScanState *node); /* * prototypes from functions in execTuples.c |