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directly to the appropriate per-node execution function, using a function pointer stored by ExecInitExpr. This speeds things up by eliminating one level of function call. The function-pointer technique also enables further small improvements such as only making one-time tests once (and then changing the function pointer). Overall this seems to gain about 10% on evaluation of simple expressions, which isn't earthshaking but seems a worthwhile gain for a relatively small hack. Per recent discussion on pghackers.
29 lines
911 B
C
29 lines
911 B
C
/*-------------------------------------------------------------------------
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*
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* nodeSubplan.h
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*
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*
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*
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* Portions Copyright (c) 1996-2003, PostgreSQL Global Development Group
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* Portions Copyright (c) 1994, Regents of the University of California
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*
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* $PostgreSQL: pgsql/src/include/executor/nodeSubplan.h,v 1.20 2004/03/17 01:02:24 tgl Exp $
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*
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*-------------------------------------------------------------------------
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*/
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#ifndef NODESUBPLAN_H
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#define NODESUBPLAN_H
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#include "nodes/execnodes.h"
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extern void ExecInitSubPlan(SubPlanState *node, EState *estate);
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extern Datum ExecSubPlan(SubPlanState *node,
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ExprContext *econtext,
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bool *isNull,
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ExprDoneCond *isDone);
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extern void ExecEndSubPlan(SubPlanState *node);
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extern void ExecReScanSetParamPlan(SubPlanState *node, PlanState *parent);
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extern void ExecSetParamPlan(SubPlanState *node, ExprContext *econtext);
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#endif /* NODESUBPLAN_H */
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