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SQL-language functions are now callable in ordinary fmgr contexts ...

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for example, an SQL function can be used in a functional index.  (I make
no promises about speed, but it'll work ;-).)  Clean up and simplify
handling of functions returning sets.
This commit is contained in:
Tom Lane
2000-08-24 03:29:15 +00:00
parent 87523ab8db
commit 782c16c6a1
35 changed files with 889 additions and 921 deletions
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39
src/backend/executor/nodeResult.c
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@ -34,7 +34,7 @@
* Portions Copyright (c) 1994, Regents of the University of California
*
* IDENTIFICATION
* $Header: /cvsroot/pgsql/src/backend/executor/nodeResult.c,v 1.15 2000/07/17 03:04:53 tgl Exp $
* $Header: /cvsroot/pgsql/src/backend/executor/nodeResult.c,v 1.16 2000/08/24 03:29:03 tgl Exp $
*
*-------------------------------------------------------------------------
*/
@ -67,8 +67,7 @@ ExecResult(Result *node)
TupleTableSlot *resultSlot;
Plan *outerPlan;
ExprContext *econtext;
bool isDone;
ProjectionInfo *projInfo;
ExprDoneCond isDone;
/* ----------------
* initialize the result node's state
@ -77,13 +76,6 @@ ExecResult(Result *node)
resstate = node->resstate;
econtext = resstate->cstate.cs_ExprContext;
/* ----------------
* Reset per-tuple memory context to free any expression evaluation
* storage allocated in the previous tuple cycle.
* ----------------
*/
ResetExprContext(econtext);
/* ----------------
* check constant qualifications like (2 > 1), if not already done
* ----------------
@ -111,12 +103,20 @@ ExecResult(Result *node)
if (resstate->cstate.cs_TupFromTlist)
{
resultSlot = ExecProject(resstate->cstate.cs_ProjInfo, &isDone);
if (!isDone)
if (isDone == ExprMultipleResult)
return resultSlot;
/* Done with that source tuple... */
resstate->cstate.cs_TupFromTlist = false;
}
/* ----------------
* Reset per-tuple memory context to free any expression evaluation
* storage allocated in the previous tuple cycle. Note this can't
* happen until we're done projecting out tuples from a scan tuple.
* ----------------
*/
ResetExprContext(econtext);
/* ----------------
* if rs_done is true then it means that we were asked to return
* a constant tuple and we already did the last time ExecResult()
@ -124,7 +124,7 @@ ExecResult(Result *node)
* Either way, now we are through.
* ----------------
*/
if (!resstate->rs_done)
while (!resstate->rs_done)
{
outerPlan = outerPlan(node);
@ -159,13 +159,18 @@ ExecResult(Result *node)
}
/* ----------------
* form the result tuple using ExecProject(), and return it.
* form the result tuple using ExecProject(), and return it
* --- unless the projection produces an empty set, in which case
* we must loop back to see if there are more outerPlan tuples.
* ----------------
*/
projInfo = resstate->cstate.cs_ProjInfo;
resultSlot = ExecProject(projInfo, &isDone);
resstate->cstate.cs_TupFromTlist = !isDone;
return resultSlot;
resultSlot = ExecProject(resstate->cstate.cs_ProjInfo, &isDone);
if (isDone != ExprEndResult)
{
resstate->cstate.cs_TupFromTlist = (isDone == ExprMultipleResult);
return resultSlot;
}
}
return NULL;