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| author | Tom Lane <tgl@sss.pgh.pa.us> | 2006-02-28 04:10:28 +0000 |
|---|---|---|
| committer | Tom Lane <tgl@sss.pgh.pa.us> | 2006-02-28 04:10:28 +0000 |
| commit | 2c0ef9777cce8f97dd01073d962e6aa31722b5ad (patch) | |
| tree | bcfa428f69e6013002a79ab29e053bd6c6cbcfa7 /src/backend/commands/explain.c | |
| parent | 7f4f42fa100872507ca10d8e0f7d923acc266ee8 (diff) | |
| download | postgresql-2c0ef9777cce8f97dd01073d962e6aa31722b5ad.tar.gz postgresql-2c0ef9777cce8f97dd01073d962e6aa31722b5ad.zip | |
Extend the ExecInitNode API so that plan nodes receive a set of flag
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
Diffstat (limited to 'src/backend/commands/explain.c')
| -rw-r--r-- | src/backend/commands/explain.c | 11 |
1 files changed, 9 insertions, 2 deletions
diff --git a/src/backend/commands/explain.c b/src/backend/commands/explain.c index 5cfc15c3391..755a64a9446 100644 --- a/src/backend/commands/explain.c +++ b/src/backend/commands/explain.c @@ -7,7 +7,7 @@ * Portions Copyright (c) 1994-5, Regents of the University of California * * IDENTIFICATION - * $PostgreSQL: pgsql/src/backend/commands/explain.c,v 1.143 2006/02/05 02:59:16 tgl Exp $ + * $PostgreSQL: pgsql/src/backend/commands/explain.c,v 1.144 2006/02/28 04:10:27 tgl Exp $ * *------------------------------------------------------------------------- */ @@ -233,6 +233,7 @@ ExplainOnePlan(QueryDesc *queryDesc, ExplainStmt *stmt, double totaltime = 0; ExplainState *es; StringInfo str; + int eflags; INSTR_TIME_SET_CURRENT(starttime); @@ -240,8 +241,14 @@ ExplainOnePlan(QueryDesc *queryDesc, ExplainStmt *stmt, if (stmt->analyze) AfterTriggerBeginQuery(); + /* Select execution options */ + if (stmt->analyze) + eflags = 0; /* default run-to-completion flags */ + else + eflags = EXEC_FLAG_EXPLAIN_ONLY; + /* call ExecutorStart to prepare the plan for execution */ - ExecutorStart(queryDesc, !stmt->analyze); + ExecutorStart(queryDesc, eflags); /* Execute the plan for statistics if asked for */ if (stmt->analyze) |