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Provide a function hook to let plug-ins get control around ExecutorRun.

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ITAGAKI Takahiro
This commit is contained in:
Tom Lane
2008-07-18 18:23:47 +00:00
parent 8d7af89016
commit 6cc88f0af5
2 changed files with 31 additions and 2 deletions
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22
src/backend/executor/execMain.c
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@ -26,7 +26,7 @@
*
*
* IDENTIFICATION
* $PostgreSQL: pgsql/src/backend/executor/execMain.c,v 1.309 2008/05/12 20:02:00 alvherre Exp $
* $PostgreSQL: pgsql/src/backend/executor/execMain.c,v 1.310 2008/07/18 18:23:46 tgl Exp $
*
*-------------------------------------------------------------------------
*/
@ -58,6 +58,9 @@
#include "utils/tqual.h"
/* Hook for plugins to get control in ExecutorRun() */
ExecutorRun_hook_type ExecutorRun_hook = NULL;
typedef struct evalPlanQual
{
Index rti;
@ -214,11 +217,28 @@ ExecutorStart(QueryDesc *queryDesc, int eflags)
* Note: count = 0 is interpreted as no portal limit, i.e., run to
* completion.
*
* We provide a function hook variable that lets loadable plugins
* get control when ExecutorRun is called. Such a plugin would
* normally call standard_ExecutorRun().
*
* ----------------------------------------------------------------
*/
TupleTableSlot *
ExecutorRun(QueryDesc *queryDesc,
ScanDirection direction, long count)
{
TupleTableSlot *result;
if (ExecutorRun_hook)
result = (*ExecutorRun_hook) (queryDesc, direction, count);
else
result = standard_ExecutorRun(queryDesc, direction, count);
return result;
}
TupleTableSlot *
standard_ExecutorRun(QueryDesc *queryDesc,
ScanDirection direction, long count)
{
EState *estate;
CmdType operation;