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Phase 3 of read-only-plans project: ExecInitExpr now builds expression

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execution state trees, and ExecEvalExpr takes an expression state tree
not an expression plan tree.  The plan tree is now read-only as far as
the executor is concerned.  Next step is to begin actually exploiting
this property.
This commit is contained in:
Tom Lane
2002-12-13 19:46:01 +00:00
parent 77b7a740f9
commit 3a4f7dde16
49 changed files with 993 additions and 815 deletions
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38
src/backend/utils/adt/sets.c
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@@ -10,7 +10,7 @@
*
*
* IDENTIFICATION
* $Header: /cvsroot/pgsql/src/backend/utils/adt/Attic/sets.c,v 1.54 2002/09/04 20:31:29 momjian Exp $
* $Header: /cvsroot/pgsql/src/backend/utils/adt/Attic/sets.c,v 1.55 2002/12/13 19:45:56 tgl Exp $
*
*-------------------------------------------------------------------------
*/
@@ -24,7 +24,6 @@
#include "catalog/pg_namespace.h"
#include "catalog/pg_proc.h"
#include "executor/executor.h"
#include "utils/fcache.h"
#include "utils/fmgroids.h"
#include "utils/sets.h"
#include "utils/syscache.h"
@@ -143,7 +142,7 @@ Datum
seteval(PG_FUNCTION_ARGS)
{
Oid funcoid = PG_GETARG_OID(0);
FunctionCachePtr fcache;
FuncExprState *fcache;
Datum result;
bool isNull;
ExprDoneCond isDone;
@@ -152,10 +151,27 @@ seteval(PG_FUNCTION_ARGS)
* If this is the first call, we need to set up the fcache for the
* target set's function.
*/
fcache = (FunctionCachePtr) fcinfo->flinfo->fn_extra;
fcache = (FuncExprState *) fcinfo->flinfo->fn_extra;
if (fcache == NULL)
{
fcache = init_fcache(funcoid, 0, fcinfo->flinfo->fn_mcxt);
MemoryContext oldcontext;
FuncExpr *func;
oldcontext = MemoryContextSwitchTo(fcinfo->flinfo->fn_mcxt);
func = makeNode(FuncExpr);
func->funcid = funcoid;
func->funcresulttype = InvalidOid; /* nothing will look at this */
func->funcretset = true;
func->funcformat = COERCE_EXPLICIT_CALL;
func->args = NIL; /* there are no arguments */
fcache = (FuncExprState *) ExecInitExpr((Expr *) func, NULL);
MemoryContextSwitchTo(oldcontext);
init_fcache(funcoid, fcache, fcinfo->flinfo->fn_mcxt);
fcinfo->flinfo->fn_extra = (void *) fcache;
}
@@ -169,22 +185,10 @@ seteval(PG_FUNCTION_ARGS)
isDone = ExprSingleResult;
result = ExecMakeFunctionResult(fcache,
NIL,
NULL, /* no econtext, see above */
&isNull,
&isDone);
/*
* If we're done with the results of this set function, get rid of its
* func cache so that we will start from the top next time. (Can you
* say "memory leak"? This feature is a crock anyway...)
*/
if (isDone != ExprMultipleResult)
{
pfree(fcache);
fcinfo->flinfo->fn_extra = NULL;
}
/*
* Return isNull/isDone status.
*/