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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 * 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" #include "utils/tqual.h"
/* Hook for plugins to get control in ExecutorRun() */
ExecutorRun_hook_type ExecutorRun_hook = NULL;
typedef struct evalPlanQual typedef struct evalPlanQual
{ {
Index rti; Index rti;
@ -214,11 +217,28 @@ ExecutorStart(QueryDesc *queryDesc, int eflags)
* Note: count = 0 is interpreted as no portal limit, i.e., run to * Note: count = 0 is interpreted as no portal limit, i.e., run to
* completion. * 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 * TupleTableSlot *
ExecutorRun(QueryDesc *queryDesc, ExecutorRun(QueryDesc *queryDesc,
ScanDirection direction, long count) 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; EState *estate;
CmdType operation; CmdType operation;

11
src/include/executor/executor.h
View File

@ -7,7 +7,7 @@
* Portions Copyright (c) 1996-2008, PostgreSQL Global Development Group * Portions Copyright (c) 1996-2008, PostgreSQL Global Development Group
* Portions Copyright (c) 1994, Regents of the University of California * Portions Copyright (c) 1994, Regents of the University of California
* *
* $PostgreSQL: pgsql/src/include/executor/executor.h,v 1.147 2008/03/28 00:21:56 tgl Exp $ * $PostgreSQL: pgsql/src/include/executor/executor.h,v 1.148 2008/07/18 18:23:47 tgl Exp $
* *
*------------------------------------------------------------------------- *-------------------------------------------------------------------------
*/ */
@ -60,6 +60,13 @@
((*(expr)->evalfunc) (expr, econtext, isNull, isDone)) ((*(expr)->evalfunc) (expr, econtext, isNull, isDone))
/* Hook for plugins to get control in ExecutorRun() */
typedef TupleTableSlot *(*ExecutorRun_hook_type) (QueryDesc *queryDesc,
ScanDirection direction,
long count);
extern PGDLLIMPORT ExecutorRun_hook_type ExecutorRun_hook;
/* /*
* prototypes from functions in execAmi.c * prototypes from functions in execAmi.c
*/ */
@ -136,6 +143,8 @@ extern HeapTuple ExecRemoveJunk(JunkFilter *junkfilter, TupleTableSlot *slot);
extern void ExecutorStart(QueryDesc *queryDesc, int eflags); extern void ExecutorStart(QueryDesc *queryDesc, int eflags);
extern TupleTableSlot *ExecutorRun(QueryDesc *queryDesc, extern TupleTableSlot *ExecutorRun(QueryDesc *queryDesc,
ScanDirection direction, long count); ScanDirection direction, long count);
extern TupleTableSlot *standard_ExecutorRun(QueryDesc *queryDesc,
ScanDirection direction, long count);
extern void ExecutorEnd(QueryDesc *queryDesc); extern void ExecutorEnd(QueryDesc *queryDesc);
extern void ExecutorRewind(QueryDesc *queryDesc); extern void ExecutorRewind(QueryDesc *queryDesc);
extern void InitResultRelInfo(ResultRelInfo *resultRelInfo, extern void InitResultRelInfo(ResultRelInfo *resultRelInfo,