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Commit7bacf2b

Browse files
committed
Add expected tuple descriptor to ReturnSetInfo information for table
functions, per suggestion from John Gray and Joe Conway. Also, fixplpgsql RETURN NEXT to verify that returned values match the expectedtupdesc.
1 parent9c27935 commit7bacf2b

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6 files changed

+113
-74
lines changed

6 files changed

+113
-74
lines changed

‎src/backend/executor/execQual.c

Lines changed: 11 additions & 12 deletions
Original file line numberDiff line numberDiff line change
@@ -8,7 +8,7 @@
88
*
99
*
1010
* IDENTIFICATION
11-
* $Header: /cvsroot/pgsql/src/backend/executor/execQual.c,v 1.102 2002/08/3000:28:41 tgl Exp $
11+
* $Header: /cvsroot/pgsql/src/backend/executor/execQual.c,v 1.103 2002/08/3023:59:46 tgl Exp $
1212
*
1313
*-------------------------------------------------------------------------
1414
*/
@@ -707,6 +707,7 @@ ExecMakeFunctionResult(FunctionCachePtr fcache,
707707
fcinfo.resultinfo= (Node*)&rsinfo;
708708
rsinfo.type=T_ReturnSetInfo;
709709
rsinfo.econtext=econtext;
710+
rsinfo.expectedDesc=NULL;
710711
rsinfo.allowedModes= (int)SFRM_ValuePerCall;
711712
rsinfo.returnMode=SFRM_ValuePerCall;
712713
/* isDone is filled below */
@@ -851,6 +852,7 @@ ExecMakeFunctionResult(FunctionCachePtr fcache,
851852
Tuplestorestate*
852853
ExecMakeTableFunctionResult(Expr*funcexpr,
853854
ExprContext*econtext,
855+
TupleDescexpectedDesc,
854856
TupleDesc*returnDesc)
855857
{
856858
Tuplestorestate*tupstore=NULL;
@@ -859,7 +861,7 @@ ExecMakeTableFunctionResult(Expr *funcexpr,
859861
List*argList;
860862
FunctionCachePtrfcache;
861863
FunctionCallInfoDatafcinfo;
862-
ReturnSetInforsinfo;/* for functions returning sets */
864+
ReturnSetInforsinfo;
863865
ExprDoneCondargDone;
864866
MemoryContextcallerContext;
865867
MemoryContextoldcontext;
@@ -918,17 +920,14 @@ ExecMakeTableFunctionResult(Expr *funcexpr,
918920
}
919921

920922
/*
921-
*If function returns set, preparea resultinfo node for
922-
*communication
923+
*Preparea resultinfo node for communication. We always do this even
924+
*if not expecting a set result, so that we can pass expectedDesc.
923925
*/
924-
if (fcache->func.fn_retset)
925-
{
926-
fcinfo.resultinfo= (Node*)&rsinfo;
927-
rsinfo.type=T_ReturnSetInfo;
928-
rsinfo.econtext=econtext;
929-
rsinfo.allowedModes= (int) (SFRM_ValuePerCall |SFRM_Materialize);
930-
}
931-
/* we set these fields always since we examine them below */
926+
fcinfo.resultinfo= (Node*)&rsinfo;
927+
rsinfo.type=T_ReturnSetInfo;
928+
rsinfo.econtext=econtext;
929+
rsinfo.expectedDesc=expectedDesc;
930+
rsinfo.allowedModes= (int) (SFRM_ValuePerCall |SFRM_Materialize);
932931
rsinfo.returnMode=SFRM_ValuePerCall;
933932
/* isDone is filled below */
934933
rsinfo.setResult=NULL;

‎src/backend/executor/nodeFunctionscan.c

Lines changed: 2 additions & 1 deletion
Original file line numberDiff line numberDiff line change
@@ -8,7 +8,7 @@
88
*
99
*
1010
* IDENTIFICATION
11-
* $Header: /cvsroot/pgsql/src/backend/executor/nodeFunctionscan.c,v 1.8 2002/08/3000:28:41 tgl Exp $
11+
* $Header: /cvsroot/pgsql/src/backend/executor/nodeFunctionscan.c,v 1.9 2002/08/3023:59:46 tgl Exp $
1212
*
1313
*-------------------------------------------------------------------------
1414
*/
@@ -79,6 +79,7 @@ FunctionNext(FunctionScan *node)
7979
scanstate->tuplestorestate=tuplestorestate=
8080
ExecMakeTableFunctionResult((Expr*)scanstate->funcexpr,
8181
econtext,
82+
scanstate->tupdesc,
8283
&funcTupdesc);
8384

8485
/*

‎src/backend/utils/fmgr/README

Lines changed: 5 additions & 0 deletions
Original file line numberDiff line numberDiff line change
@@ -423,6 +423,11 @@ function is called in). The function stores pointers to the Tuplestore and
423423
TupleDesc into ReturnSetInfo, sets returnMode to indicate materialize mode,
424424
and returns null. isDone is not used and should be left at ExprSingleResult.
425425

426+
If the function is being called as a table function (ie, it appears in a
427+
FROM item), then the expected tuple descriptor is passed in ReturnSetInfo;
428+
in other contexts the expectedDesc field will be NULL. The function need
429+
not pay attention to expectedDesc, but it may be useful in special cases.
430+
426431
There is no support for functions accepting sets; instead, the function will
427432
be called multiple times, once for each element of the input set.
428433

‎src/include/executor/executor.h

Lines changed: 2 additions & 1 deletion
Original file line numberDiff line numberDiff line change
@@ -7,7 +7,7 @@
77
* Portions Copyright (c) 1996-2002, PostgreSQL Global Development Group
88
* Portions Copyright (c) 1994, Regents of the University of California
99
*
10-
* $Id: executor.h,v 1.75 2002/08/3000:28:41 tgl Exp $
10+
* $Id: executor.h,v 1.76 2002/08/3023:59:46 tgl Exp $
1111
*
1212
*-------------------------------------------------------------------------
1313
*/
@@ -82,6 +82,7 @@ extern Datum ExecMakeFunctionResult(FunctionCachePtr fcache,
8282
ExprDoneCond*isDone);
8383
externTuplestorestate*ExecMakeTableFunctionResult(Expr*funcexpr,
8484
ExprContext*econtext,
85+
TupleDescexpectedDesc,
8586
TupleDesc*returnDesc);
8687
externDatumExecEvalExpr(Node*expression,ExprContext*econtext,
8788
bool*isNull,ExprDoneCond*isDone);

‎src/include/nodes/execnodes.h

Lines changed: 8 additions & 4 deletions
Original file line numberDiff line numberDiff line change
@@ -7,7 +7,7 @@
77
* Portions Copyright (c) 1996-2002, PostgreSQL Global Development Group
88
* Portions Copyright (c) 1994, Regents of the University of California
99
*
10-
* $Id: execnodes.h,v 1.73 2002/08/3000:28:41 tgl Exp $
10+
* $Id: execnodes.h,v 1.74 2002/08/3023:59:46 tgl Exp $
1111
*
1212
*-------------------------------------------------------------------------
1313
*/
@@ -147,12 +147,16 @@ typedef enum
147147
typedefstructReturnSetInfo
148148
{
149149
NodeTagtype;
150+
/* values set by caller: */
150151
ExprContext*econtext;/* context function is being called in */
152+
TupleDescexpectedDesc;/* tuple descriptor expected by caller */
151153
intallowedModes;/* bitmask: return modes caller can handle */
152-
SetFunctionReturnModereturnMode;/* actual return mode */
154+
/* result status from function (but pre-initialized by caller): */
155+
SetFunctionReturnModereturnMode;/* actual return mode */
153156
ExprDoneCondisDone;/* status for ValuePerCall mode */
154-
Tuplestorestate*setResult;/* return object for Materialize mode */
155-
TupleDescsetDesc;/* descriptor for Materialize mode */
157+
/* fields filled by function in Materialize return mode: */
158+
Tuplestorestate*setResult;/* holds the complete returned tuple set */
159+
TupleDescsetDesc;/* actual descriptor for returned tuples */
156160
}ReturnSetInfo;
157161

158162
/* ----------------

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