pgsql-server/src backend/executor/execMain.c b ...

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pgsql-server/src backend/executor/execMain.c b ...

От:
tgl@postgresql.org (Tom Lane)
Дата:
CVSROOT:	/cvsroot
Module name:	pgsql-server
Changes by:	tgl@postgresql.org	03/02/03 10:07:09

Modified files:
	src/backend/executor: execMain.c execScan.c nodeIndexscan.c 
	                      nodeSeqscan.c nodeTidscan.c 
	src/backend/optimizer/plan: createplan.c planner.c 
	src/backend/optimizer/util: plancat.c relnode.c 
	src/include/executor: executor.h 
	src/include/nodes: relation.h 
	src/include/optimizer: plancat.h 

Log message:
	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%.
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