diff options
| -rw-r--r-- | src/backend/executor/execMain.c | 22 | ||||
| -rw-r--r-- | src/include/executor/executor.h | 11 |
2 files changed, 31 insertions, 2 deletions
diff --git a/src/backend/executor/execMain.c b/src/backend/executor/execMain.c index 7da618033d8..93f78046707 100644 --- a/src/backend/executor/execMain.c +++ b/src/backend/executor/execMain.c @@ -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; @@ -214,12 +217,29 @@ 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; DestReceiver *dest; diff --git a/src/include/executor/executor.h b/src/include/executor/executor.h index 2a920cebb9a..71cb94d4c5d 100644 --- a/src/include/executor/executor.h +++ b/src/include/executor/executor.h @@ -7,7 +7,7 @@ * Portions Copyright (c) 1996-2008, PostgreSQL Global Development Group * 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)) +/* 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 */ @@ -136,6 +143,8 @@ extern HeapTuple ExecRemoveJunk(JunkFilter *junkfilter, TupleTableSlot *slot); extern void ExecutorStart(QueryDesc *queryDesc, int eflags); extern TupleTableSlot *ExecutorRun(QueryDesc *queryDesc, ScanDirection direction, long count); +extern TupleTableSlot *standard_ExecutorRun(QueryDesc *queryDesc, + ScanDirection direction, long count); extern void ExecutorEnd(QueryDesc *queryDesc); extern void ExecutorRewind(QueryDesc *queryDesc); extern void InitResultRelInfo(ResultRelInfo *resultRelInfo, |