database/postgres
1
0
Fork 0
mirror of https://github.com/postgres/postgres.git synced 2025-06-30 21:42:05 +03:00
Code Activity

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

Browse Source 
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
Download Patch File Download Diff File Expand all files Collapse all files

11
src/backend/commands/explain.c
View File

@ -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)