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First pass at set-returning-functions in FROM, by Joe Conway with

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some kibitzing from Tom Lane.  Not everything works yet, and there's
no documentation or regression test, but let's commit this so Joe
doesn't need to cope with tracking changes in so many files ...
This commit is contained in:
Tom Lane
2002-05-12 20:10:05 +00:00
parent 71009354c8
commit f9e4f611a1
48 changed files with 1813 additions and 329 deletions
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73
src/include/nodes/execnodes.h
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@ -7,7 +7,7 @@
* Portions Copyright (c) 1996-2001, PostgreSQL Global Development Group
* Portions Copyright (c) 1994, Regents of the University of California
*
* $Id: execnodes.h,v 1.67 2001/11/21 22:57:01 tgl Exp $
* $Id: execnodes.h,v 1.68 2002/05/12 20:10:04 tgl Exp $
*
*-------------------------------------------------------------------------
*/
@ -52,6 +52,21 @@ typedef struct IndexInfo
bool ii_Unique;
} IndexInfo;
/* ----------------
* ExprContext_CB
*
* List of callbacks to be called at ExprContext shutdown.
* ----------------
*/
typedef void (*ExprContextCallbackFunction) (Datum arg);
typedef struct ExprContext_CB
{
struct ExprContext_CB *next;
ExprContextCallbackFunction function;
Datum arg;
} ExprContext_CB;
/* ----------------
* ExprContext
*
@ -77,20 +92,27 @@ typedef struct IndexInfo
*/
typedef struct ExprContext
{
NodeTag type;
NodeTag type;
/* Tuples that Var nodes in expression may refer to */
TupleTableSlot *ecxt_scantuple;
TupleTableSlot *ecxt_innertuple;
TupleTableSlot *ecxt_outertuple;
/* Memory contexts for expression evaluation --- see notes above */
MemoryContext ecxt_per_query_memory;
MemoryContext ecxt_per_tuple_memory;
MemoryContext ecxt_per_query_memory;
MemoryContext ecxt_per_tuple_memory;
/* Values to substitute for Param nodes in expression */
ParamExecData *ecxt_param_exec_vals; /* for PARAM_EXEC params */
ParamListInfo ecxt_param_list_info; /* for other param types */
ParamExecData *ecxt_param_exec_vals; /* for PARAM_EXEC params */
ParamListInfo ecxt_param_list_info; /* for other param types */
/* Values to substitute for Aggref nodes in expression */
Datum *ecxt_aggvalues; /* precomputed values for Aggref nodes */
bool *ecxt_aggnulls; /* null flags for Aggref nodes */
Datum *ecxt_aggvalues; /* precomputed values for Aggref nodes */
bool *ecxt_aggnulls; /* null flags for Aggref nodes */
/* Functions to call back when ExprContext is shut down */
ExprContext_CB *ecxt_callbacks;
} ExprContext;
/*
@ -107,7 +129,8 @@ typedef enum
* 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.
* 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.
*/
@ -115,9 +138,9 @@ typedef struct ReturnSetInfo
{
NodeTag type;
ExprDoneCond isDone;
ExprContext *econtext;
} ReturnSetInfo;
/* ----------------
* ProjectionInfo node information
*
@ -481,6 +504,36 @@ typedef struct SubqueryScanState
EState *sss_SubEState;
} SubqueryScanState;
/* ----------------
* FunctionScanState information
*
* Function nodes are used to scan the results of a
* function appearing in FROM (typically a function returning set).
*
* functionmode function operating mode:
* - repeated call
* - materialize
* - return query
* tuplestorestate private state of tuplestore.c
* ----------------
*/
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;
Node *funcexpr; /* function expression being evaluated */
bool returnsTuple; /* does function return tuples? */
} FunctionScanState;
/* ----------------------------------------------------------------
* Join State Information
* ----------------------------------------------------------------