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Extend the ExecInitNode API so that plan nodes receive a set of flag

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bits indicating which optional capabilities can actually be exercised
at runtime.  This will allow Sort and Material nodes, and perhaps later
other nodes, to avoid unnecessary overhead in common cases.
This commit just adds the infrastructure and arranges to pass the correct
flag values down to plan nodes; none of the actual optimizations are here
yet.  I'm committing this separately in case anyone wants to measure the
added overhead.  (It should be negligible.)

Simon Riggs and Tom Lane
This commit is contained in:
Tom Lane
2006-02-28 04:10:28 +00:00
parent 7f4f42fa10
commit 2c0ef9777c
53 changed files with 336 additions and 174 deletions
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20
src/backend/tcop/pquery.c
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@ -8,7 +8,7 @@
*
*
* IDENTIFICATION
* $PostgreSQL: pgsql/src/backend/tcop/pquery.c,v 1.99 2006/02/21 23:01:54 neilc Exp $
* $PostgreSQL: pgsql/src/backend/tcop/pquery.c,v 1.100 2006/02/28 04:10:28 tgl Exp $
*
*-------------------------------------------------------------------------
*/
@ -164,9 +164,9 @@ ProcessQuery(Query *parsetree,
AfterTriggerBeginQuery();
/*
* Call ExecStart to prepare the plan for execution
* Call ExecutorStart to prepare the plan for execution
*/
ExecutorStart(queryDesc, false);
ExecutorStart(queryDesc, 0);
/*
* Run the plan to completion.
@ -329,6 +329,7 @@ PortalStart(Portal portal, ParamListInfo params, Snapshot snapshot)
MemoryContext savePortalContext;
MemoryContext oldContext;
QueryDesc *queryDesc;
int eflags;
AssertArg(PortalIsValid(portal));
AssertState(portal->queryContext != NULL); /* query defined? */
@ -394,9 +395,18 @@ PortalStart(Portal portal, ParamListInfo params, Snapshot snapshot)
*/
/*
* Call ExecStart to prepare the plan for execution
* If it's a scrollable cursor, executor needs to support
* REWIND and backwards scan.
*/
ExecutorStart(queryDesc, false);
if (portal->cursorOptions & CURSOR_OPT_SCROLL)
eflags = EXEC_FLAG_REWIND | EXEC_FLAG_BACKWARD;
else
eflags = 0; /* default run-to-completion flags */
/*
* Call ExecutorStart to prepare the plan for execution
*/
ExecutorStart(queryDesc, eflags);
/*
* This tells PortalCleanup to shut down the executor