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PL/pgSQL functions can return sets. Neil Conway's patch, modified so

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that the functionality is available to anyone via ReturnSetInfo, rather
than hard-wiring it to PL/pgSQL.
This commit is contained in:
Tom Lane
2002-08-30 00:28:41 +00:00
parent 82ccb420d5
commit e107f3a7e3
21 changed files with 957 additions and 408 deletions
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47
src/include/nodes/execnodes.h
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@ -7,7 +7,7 @@
* Portions Copyright (c) 1996-2002, PostgreSQL Global Development Group
* Portions Copyright (c) 1994, Regents of the University of California
*
* $Id: execnodes.h,v 1.72 2002/08/29 00:17:06 tgl Exp $
* $Id: execnodes.h,v 1.73 2002/08/30 00:28:41 tgl Exp $
*
*-------------------------------------------------------------------------
*/
@ -21,6 +21,8 @@
#include "fmgr.h"
#include "nodes/params.h"
#include "nodes/primnodes.h"
#include "utils/tuplestore.h"
/* ----------------
* IndexInfo information
@ -125,20 +127,32 @@ typedef enum
ExprEndResult /* there are no more elements in the set */
} ExprDoneCond;
/*
* Return modes for functions returning sets. Note values must be chosen
* as separate bits so that a bitmask can be formed to indicate supported
* modes.
*/
typedef enum
{
SFRM_ValuePerCall = 0x01, /* one value returned per call */
SFRM_Materialize = 0x02 /* result set instantiated in Tuplestore */
} SetFunctionReturnMode;
/*
* When calling a function that might return a set (multiple rows),
* a node of this type is passed as fcinfo->resultinfo to allow
* return status to be passed back. A function returning set should
* raise an error if no such resultinfo is provided. The ExprContext
* in which the function is being called is also made available.
*
* XXX this mechanism is a quick hack and probably needs to be redesigned.
* raise an error if no such resultinfo is provided.
*/
typedef struct ReturnSetInfo
{
NodeTag type;
ExprDoneCond isDone;
ExprContext *econtext;
ExprContext *econtext; /* context function is being called in */
int allowedModes; /* bitmask: return modes caller can handle */
SetFunctionReturnMode returnMode; /* actual return mode */
ExprDoneCond isDone; /* status for ValuePerCall mode */
Tuplestorestate *setResult; /* return object for Materialize mode */
TupleDesc setDesc; /* descriptor for Materialize mode */
} ReturnSetInfo;
/* ----------------
@ -509,32 +523,17 @@ typedef struct SubqueryScanState
* Function nodes are used to scan the results of a
* function appearing in FROM (typically a function returning set).
*
* functionmode function operating mode
* tupdesc function's return tuple description
* tupdesc expected return tuple description
* tuplestorestate private state of tuplestore.c
* funcexpr function expression being evaluated
* returnsTuple does function return tuples?
* fn_typeid OID of function return type
* fn_typtype return type's typtype
* ----------------
*/
typedef enum FunctionMode
{
PM_REPEATEDCALL,
PM_MATERIALIZE,
PM_QUERY
} FunctionMode;
typedef struct FunctionScanState
{
CommonScanState csstate; /* its first field is NodeTag */
FunctionMode functionmode;
TupleDesc tupdesc;
void *tuplestorestate;
Tuplestorestate *tuplestorestate;
Node *funcexpr;
bool returnsTuple;
Oid fn_typeid;
char fn_typtype;
} FunctionScanState;
/* ----------------------------------------------------------------