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Use a shutdown callback to clear setArgsValid in a FuncExprState that is

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evaluating a set-valued function.  This fixes some additional problems
with rescanning partially-evaluated SRFs.
This commit is contained in:
Tom Lane 2003-12-18 22:23:42 +00:00
parent ed8e5143c2
commit 54840eca2e
2 changed files with 34 additions and 2 deletions
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27
src/backend/executor/execQual.c
View File

@ -8,7 +8,7 @@
*
*
* IDENTIFICATION
* $PostgreSQL: pgsql/src/backend/executor/execQual.c,v 1.151 2003/11/29 19:51:48 pgsql Exp $
* $PostgreSQL: pgsql/src/backend/executor/execQual.c,v 1.152 2003/12/18 22:23:42 tgl Exp $
*
*-------------------------------------------------------------------------
*/
@ -636,9 +636,26 @@ init_fcache(Oid foid, FuncExprState *fcache, MemoryContext fcacheCxt)
/* Initialize additional info */
fcache->setArgsValid = false;
fcache->shutdown_reg = false;
fcache->func.fn_expr = (Node *) fcache->xprstate.expr;
}
/*
* callback function in case a FuncExpr returning a set needs to be shut down
* before it has been run to completion
*/
static void
ShutdownFuncExpr(Datum arg)
{
FuncExprState *fcache = (FuncExprState *) DatumGetPointer(arg);
/* Clear any active set-argument state */
fcache->setArgsValid = false;
/* execUtils will deregister the callback... */
fcache->shutdown_reg = false;
}
/*
* Evaluate arguments for a function.
*/
@ -827,6 +844,14 @@ ExecMakeFunctionResult(FuncExprState *fcache,
memcpy(&fcache->setArgs, &fcinfo, sizeof(fcinfo));
fcache->setHasSetArg = hasSetArg;
fcache->setArgsValid = true;
/* Register cleanup callback if we didn't already */
if (!fcache->shutdown_reg)
{
RegisterExprContextCallback(econtext,
ShutdownFuncExpr,
PointerGetDatum(fcache));
fcache->shutdown_reg = true;
}
}
/*

9
src/include/nodes/execnodes.h
View File

@ -7,7 +7,7 @@
* Portions Copyright (c) 1996-2003, PostgreSQL Global Development Group
* Portions Copyright (c) 1994, Regents of the University of California
*
* $PostgreSQL: pgsql/src/include/nodes/execnodes.h,v 1.108 2003/11/29 22:41:06 pgsql Exp $
* $PostgreSQL: pgsql/src/include/nodes/execnodes.h,v 1.109 2003/12/18 22:23:42 tgl Exp $
*
*-------------------------------------------------------------------------
*/
@ -481,6 +481,13 @@ typedef struct FuncExprState
*/
bool setHasSetArg; /* some argument returns a set */
/*
* Flag to remember whether we have registered a shutdown callback for
* this FuncExprState. We do so only if setArgsValid has been true at
* least once (since all the callback is for is to clear setArgsValid).
*/
bool shutdown_reg; /* a shutdown callback is registered */
/*
* Current argument data for a set-valued function; contains valid
* data only if setArgsValid is true.