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/*-------------------------------------------------------------------------
*
* executor.h
* support for the POSTGRES executor module
*
*
* Portions Copyright (c) 1996-2001, PostgreSQL Global Development Group
* Portions Copyright (c) 1994, Regents of the University of California
*
* $Id: executor.h,v 1.55 2001/01/24 19:43:23 momjian Exp $
*
*-------------------------------------------------------------------------
*/
#ifndef EXECUTOR_H
#define EXECUTOR_H
#include "executor/execdesc.h"
/* ----------------
* TupIsNull
*
* This is used mainly to detect when there are no more
* tuples to process.
* ----------------
*/
/* return: true if tuple in slot is NULL, slot is slot to test */
#define TupIsNull(slot) \
((slot) == NULL || (slot)->val == NULL)
/*
* prototypes from functions in execAmi.c
*/
extern void ExecOpenScanR(Oid relOid, int nkeys, ScanKey skeys, bool isindex,
ScanDirection dir, Snapshot snapshot,
Relation *returnRelation, Pointer *returnScanDesc);
extern void ExecCloseR(Plan *node);
extern void ExecReScan(Plan *node, ExprContext *exprCtxt, Plan *parent);
extern HeapScanDesc ExecReScanR(Relation relDesc, HeapScanDesc scanDesc,
ScanDirection direction, int nkeys, ScanKey skeys);
extern void ExecMarkPos(Plan *node);
extern void ExecRestrPos(Plan *node);
/*
* prototypes from functions in execJunk.c
*/
extern JunkFilter *ExecInitJunkFilter(List *targetList, TupleDesc tupType);
extern bool ExecGetJunkAttribute(JunkFilter *junkfilter, TupleTableSlot *slot,
char *attrName, Datum *value, bool *isNull);
extern HeapTuple ExecRemoveJunk(JunkFilter *junkfilter, TupleTableSlot *slot);
/*
* prototypes from functions in execMain.c
*/
extern TupleDesc ExecutorStart(QueryDesc *queryDesc, EState *estate);
extern TupleTableSlot *ExecutorRun(QueryDesc *queryDesc, EState *estate,
int feature, long count);
extern void ExecutorEnd(QueryDesc *queryDesc, EState *estate);
extern void ExecConstraints(char *caller, ResultRelInfo *resultRelInfo,
TupleTableSlot *slot, EState *estate);
extern TupleTableSlot *EvalPlanQual(EState *estate, Index rti,
ItemPointer tid);
/*
* prototypes from functions in execProcnode.c
*/
extern bool ExecInitNode(Plan *node, EState *estate, Plan *parent);
extern TupleTableSlot *ExecProcNode(Plan *node, Plan *parent);
extern int ExecCountSlotsNode(Plan *node);
extern void ExecEndNode(Plan *node, Plan *parent);
/*
* prototypes from functions in execQual.c
*/
extern Datum ExecEvalParam(Param *expression, ExprContext *econtext,
bool *isNull);
extern Datum GetAttributeByNum(TupleTableSlot *slot, AttrNumber attrno,
bool *isNull);
extern Datum GetAttributeByName(TupleTableSlot *slot, char *attname,
bool *isNull);
extern Datum ExecMakeFunctionResult(FunctionCachePtr fcache,
List *arguments,
ExprContext *econtext,
bool *isNull,
ExprDoneCond *isDone);
extern Datum ExecEvalExpr(Node *expression, ExprContext *econtext,
bool *isNull, ExprDoneCond *isDone);
extern Datum ExecEvalExprSwitchContext(Node *expression, ExprContext *econtext,
bool *isNull, ExprDoneCond *isDone);
extern bool ExecQual(List *qual, ExprContext *econtext, bool resultForNull);
extern int ExecTargetListLength(List *targetlist);
extern int ExecCleanTargetListLength(List *targetlist);
extern TupleTableSlot *ExecProject(ProjectionInfo *projInfo,
ExprDoneCond *isDone);
/*
* prototypes from functions in execScan.c
*/
typedef TupleTableSlot *(*ExecScanAccessMtd) (Scan *node);
extern TupleTableSlot *ExecScan(Scan *node, ExecScanAccessMtd accessMtd);
/*
* prototypes from functions in execTuples.c
*/
extern TupleTable ExecCreateTupleTable(int initialSize);
extern void ExecDropTupleTable(TupleTable table, bool shouldFree);
extern TupleTableSlot *ExecAllocTableSlot(TupleTable table);
extern TupleTableSlot *ExecStoreTuple(HeapTuple tuple,
TupleTableSlot *slot,
Buffer buffer,
bool shouldFree);
extern TupleTableSlot *ExecClearTuple(TupleTableSlot *slot);
extern TupleDesc ExecSetSlotDescriptor(TupleTableSlot *slot,
TupleDesc tupdesc);
extern void ExecSetSlotDescriptorIsNew(TupleTableSlot *slot, bool isNew);
extern void ExecInitResultTupleSlot(EState *estate, CommonState *commonstate);
extern void ExecInitScanTupleSlot(EState *estate,
CommonScanState *commonscanstate);
extern TupleTableSlot *ExecInitExtraTupleSlot(EState *estate);
extern TupleTableSlot *ExecInitNullTupleSlot(EState *estate,
TupleDesc tupType);
extern TupleDesc ExecGetTupType(Plan *node);
extern TupleDesc ExecTypeFromTL(List *targetList);
extern void SetChangedParamList(Plan *node, List *newchg);
/*
* prototypes from functions in execUtils.c
*/
extern void ResetTupleCount(void);
extern void ExecAssignExprContext(EState *estate, CommonState *commonstate);
extern void ExecAssignResultType(CommonState *commonstate,
TupleDesc tupDesc);
extern void ExecAssignResultTypeFromOuterPlan(Plan *node,
CommonState *commonstate);
extern void ExecAssignResultTypeFromTL(Plan *node, CommonState *commonstate);
extern TupleDesc ExecGetResultType(CommonState *commonstate);
extern void ExecAssignProjectionInfo(Plan *node, CommonState *commonstate);
extern void ExecFreeProjectionInfo(CommonState *commonstate);
extern void ExecFreeExprContext(CommonState *commonstate);
extern TupleDesc ExecGetScanType(CommonScanState *csstate);
extern void ExecAssignScanType(CommonScanState *csstate,
TupleDesc tupDesc);
extern void ExecAssignScanTypeFromOuterPlan(Plan *node,
CommonScanState *csstate);
extern Form_pg_attribute ExecGetTypeInfo(Relation relDesc);
extern ExprContext *MakeExprContext(TupleTableSlot *slot,
MemoryContext queryContext);
extern void FreeExprContext(ExprContext *econtext);
#define ResetExprContext(econtext) \
MemoryContextReset((econtext)->ecxt_per_tuple_memory)
extern ExprContext *MakePerTupleExprContext(EState *estate);
/* Get an EState's per-output-tuple exprcontext, making it if first use */
#define GetPerTupleExprContext(estate) \
((estate)->es_per_tuple_exprcontext ? \
(estate)->es_per_tuple_exprcontext : \
MakePerTupleExprContext(estate))
#define GetPerTupleMemoryContext(estate) \
(GetPerTupleExprContext(estate)->ecxt_per_tuple_memory)
/* Reset an EState's per-output-tuple exprcontext, if one's been created */
#define ResetPerTupleExprContext(estate) \
do { \
if ((estate)->es_per_tuple_exprcontext) \
ResetExprContext((estate)->es_per_tuple_exprcontext); \
} while (0)
extern void ExecOpenIndices(ResultRelInfo *resultRelInfo);
extern void ExecCloseIndices(ResultRelInfo *resultRelInfo);
extern void ExecInsertIndexTuples(TupleTableSlot *slot, ItemPointer tupleid,
EState *estate, bool is_update);
#endif /* EXECUTOR_H */
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