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Commit6cc88f0

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Provide a function hook to let plug-ins get control around ExecutorRun.
ITAGAKI Takahiro
1 parent8d7af89 commit6cc88f0

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2 files changed

+31
-2
lines changed

2 files changed

+31
-2
lines changed

‎src/backend/executor/execMain.c

Lines changed: 21 additions & 1 deletion
Original file line numberDiff line numberDiff line change
@@ -26,7 +26,7 @@
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*
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*
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* IDENTIFICATION
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* $PostgreSQL: pgsql/src/backend/executor/execMain.c,v 1.309 2008/05/12 20:02:00 alvherre Exp $
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* $PostgreSQL: pgsql/src/backend/executor/execMain.c,v 1.310 2008/07/18 18:23:46 tgl Exp $
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*
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*-------------------------------------------------------------------------
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*/
@@ -58,6 +58,9 @@
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#include"utils/tqual.h"
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61+
/* Hook for plugins to get control in ExecutorRun() */
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ExecutorRun_hook_typeExecutorRun_hook=NULL;
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6164
typedefstructevalPlanQual
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{
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Indexrti;
@@ -214,11 +217,28 @@ ExecutorStart(QueryDesc *queryDesc, int eflags)
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*Note: count = 0 is interpreted as no portal limit, i.e., run to
215218
*completion.
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*
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*We provide a function hook variable that lets loadable plugins
221+
*get control when ExecutorRun is called. Such a plugin would
222+
*normally call standard_ExecutorRun().
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*
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* ----------------------------------------------------------------
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*/
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TupleTableSlot*
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ExecutorRun(QueryDesc*queryDesc,
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ScanDirectiondirection,longcount)
229+
{
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TupleTableSlot*result;
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if (ExecutorRun_hook)
233+
result= (*ExecutorRun_hook) (queryDesc,direction,count);
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else
235+
result=standard_ExecutorRun(queryDesc,direction,count);
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returnresult;
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}
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TupleTableSlot*
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standard_ExecutorRun(QueryDesc*queryDesc,
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ScanDirectiondirection,longcount)
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{
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EState*estate;
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CmdTypeoperation;

‎src/include/executor/executor.h

Lines changed: 10 additions & 1 deletion
Original file line numberDiff line numberDiff line change
@@ -7,7 +7,7 @@
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* Portions Copyright (c) 1996-2008, PostgreSQL Global Development Group
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* Portions Copyright (c) 1994, Regents of the University of California
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*
10-
* $PostgreSQL: pgsql/src/include/executor/executor.h,v 1.147 2008/03/28 00:21:56 tgl Exp $
10+
* $PostgreSQL: pgsql/src/include/executor/executor.h,v 1.148 2008/07/18 18:23:47 tgl Exp $
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*
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*-------------------------------------------------------------------------
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*/
@@ -60,6 +60,13 @@
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((*(expr)->evalfunc) (expr, econtext, isNull, isDone))
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63+
/* Hook for plugins to get control in ExecutorRun() */
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typedefTupleTableSlot*(*ExecutorRun_hook_type) (QueryDesc*queryDesc,
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ScanDirectiondirection,
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longcount);
67+
externPGDLLIMPORTExecutorRun_hook_typeExecutorRun_hook;
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/*
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* prototypes from functions in execAmi.c
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*/
@@ -136,6 +143,8 @@ extern HeapTuple ExecRemoveJunk(JunkFilter *junkfilter, TupleTableSlot *slot);
136143
externvoidExecutorStart(QueryDesc*queryDesc,inteflags);
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externTupleTableSlot*ExecutorRun(QueryDesc*queryDesc,
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ScanDirectiondirection,longcount);
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externTupleTableSlot*standard_ExecutorRun(QueryDesc*queryDesc,
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ScanDirectiondirection,longcount);
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externvoidExecutorEnd(QueryDesc*queryDesc);
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externvoidExecutorRewind(QueryDesc*queryDesc);
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externvoidInitResultRelInfo(ResultRelInfo*resultRelInfo,

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