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Some infrastructure changes for the upcoming auto-explain contrib module:

Browse Source 
* Refactor explain.c slightly to export a convenient-to-use subroutine
for printing EXPLAIN results.

* Provide hooks for plugins to get control at ExecutorStart and ExecutorEnd
as well as ExecutorRun.

* Add some minimal support for tracking the total runtime of ExecutorRun.
This code won't actually do anything unless a plugin prods it to.

* Change the API of the DefineCustomXXXVariable functions to allow nonzero
"flags" to be specified for a custom GUC variable.  While at it, also make
the "bootstrap" default value for custom GUCs be explicitly specified as a
parameter to these functions.  This is to eliminate confusion over where the
default comes from, as has been expressed in the past by some users of the
custom-variable facility.

* Refactor GUC code a bit to ensure that a custom variable gets initialized to
something valid (like its default value) even if the placeholder value was
invalid.
This commit is contained in:
Tom Lane
2008-11-19 01:10:24 +00:00
parent 667685ca7d
commit cd35e9d746
10 changed files with 293 additions and 170 deletions
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44
src/backend/executor/execMain.c
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@ -26,7 +26,7 @@
*
*
* IDENTIFICATION
* $PostgreSQL: pgsql/src/backend/executor/execMain.c,v 1.317 2008/11/16 17:34:28 tgl Exp $
* $PostgreSQL: pgsql/src/backend/executor/execMain.c,v 1.318 2008/11/19 01:10:23 tgl Exp $
*
*-------------------------------------------------------------------------
*/
@ -60,8 +60,10 @@
#include "utils/tqual.h"
/* Hook for plugins to get control in ExecutorRun() */
ExecutorRun_hook_type ExecutorRun_hook = NULL;
/* Hooks for plugins to get control in ExecutorStart/Run/End() */
ExecutorStart_hook_type ExecutorStart_hook = NULL;
ExecutorRun_hook_type ExecutorRun_hook = NULL;
ExecutorEnd_hook_type ExecutorEnd_hook = NULL;
typedef struct evalPlanQual
{
@ -129,10 +131,24 @@ static void intorel_destroy(DestReceiver *self);
*
* NB: the CurrentMemoryContext when this is called will become the parent
* of the per-query context used for this Executor invocation.
*
* We provide a function hook variable that lets loadable plugins
* get control when ExecutorStart is called. Such a plugin would
* normally call standard_ExecutorStart().
*
* ----------------------------------------------------------------
*/
void
ExecutorStart(QueryDesc *queryDesc, int eflags)
{
if (ExecutorStart_hook)
(*ExecutorStart_hook) (queryDesc, eflags);
else
standard_ExecutorStart(queryDesc, eflags);
}
void
standard_ExecutorStart(QueryDesc *queryDesc, int eflags)
{
EState *estate;
MemoryContext oldcontext;
@ -263,6 +279,10 @@ standard_ExecutorRun(QueryDesc *queryDesc,
*/
oldcontext = MemoryContextSwitchTo(estate->es_query_cxt);
/* Allow instrumentation of ExecutorRun overall runtime */
if (queryDesc->totaltime)
InstrStartNode(queryDesc->totaltime);
/*
* extract information from the query descriptor and the query feature.
*/
@ -298,6 +318,9 @@ standard_ExecutorRun(QueryDesc *queryDesc,
if (sendTuples)
(*dest->rShutdown) (dest);
if (queryDesc->totaltime)
InstrStopNode(queryDesc->totaltime, estate->es_processed);
MemoryContextSwitchTo(oldcontext);
}
@ -306,10 +329,24 @@ standard_ExecutorRun(QueryDesc *queryDesc,
*
* This routine must be called at the end of execution of any
* query plan
*
* We provide a function hook variable that lets loadable plugins
* get control when ExecutorEnd is called. Such a plugin would
* normally call standard_ExecutorEnd().
*
* ----------------------------------------------------------------
*/
void
ExecutorEnd(QueryDesc *queryDesc)
{
if (ExecutorEnd_hook)
(*ExecutorEnd_hook) (queryDesc);
else
standard_ExecutorEnd(queryDesc);
}
void
standard_ExecutorEnd(QueryDesc *queryDesc)
{
EState *estate;
MemoryContext oldcontext;
@ -353,6 +390,7 @@ ExecutorEnd(QueryDesc *queryDesc)
queryDesc->tupDesc = NULL;
queryDesc->estate = NULL;
queryDesc->planstate = NULL;
queryDesc->totaltime = NULL;
}
/* ----------------------------------------------------------------