/*-------------------------------------------------------------------------
 *
 * executor.h--
 *    support for the POSTGRES executor module
 *
 *
 * Copyright (c) 1994, Regents of the University of California
 *
 * $Id: executor.h,v 1.7 1996/12/26 17:53:40 momjian Exp $
 *
 *-------------------------------------------------------------------------
 */
#ifndef EXECUTOR_H
#define EXECUTOR_H

#include <catalog/pg_index.h>
#include <access/itup.h>
#include <stdio.h>
#include <executor/execdesc.h>

/* ----------------------------------------------------------------
 * ----------------------------------------------------------------
 */


/*
 * prototypes from functions in execAmi.c
 */
extern void ExecOpenScanR(Oid relOid, int nkeys, ScanKey skeys, bool isindex,
		   ScanDirection dir, TimeQual timeRange,
		   Relation *returnRelation, Pointer *returnScanDesc);
extern Relation ExecOpenR(Oid relationOid, bool isindex);
extern Pointer ExecBeginScan(Relation relation, int nkeys, ScanKey skeys,
		      bool isindex, ScanDirection dir, TimeQual time_range);
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);
extern Relation ExecCreatR(TupleDesc tupType, Oid relationOid);

/*
 * prototypes from functions in execJunk.c
 */
extern JunkFilter *ExecInitJunkFilter(List *targetList);
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 int ExecutorLimit(int limit);
extern TupleDesc ExecutorStart(QueryDesc *queryDesc, EState *estate);
extern TupleTableSlot* ExecutorRun(QueryDesc *queryDesc, EState *estate, int feature, int count);
extern void ExecutorEnd(QueryDesc *queryDesc, EState *estate);

/*
 * 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 bool execConstByVal;
extern int 	execConstLen;

extern Datum ExecExtractResult(TupleTableSlot *slot, AttrNumber attnum,
			bool *isNull);
extern Datum ExecEvalVar(Var *variable, ExprContext *econtext, bool *isNull);
extern Datum ExecEvalParam(Param *expression, ExprContext *econtext,
			   bool *isNull);
extern char *GetAttributeByNum(TupleTableSlot *slot, AttrNumber attrno,
			bool *isNull);
extern char *att_by_num(TupleTableSlot *slot, AttrNumber attrno,
			bool *isNull);
/* stop here */
extern char *GetAttributeByName(TupleTableSlot *slot, char *attname,
				bool *isNull);
extern char *att_by_name(TupleTableSlot *slot, char *attname, bool *isNull);
extern void ExecEvalFuncArgs(FunctionCachePtr fcache, ExprContext *econtext,
		      List *argList, Datum argV[], bool *argIsDone);
extern Datum ExecMakeFunctionResult(Node *node, List *arguments,
		ExprContext *econtext, bool *isNull, bool *isDone);
extern Datum ExecEvalOper(Expr *opClause, ExprContext *econtext,
			  bool *isNull);
extern Datum ExecEvalFunc(Expr *funcClause, ExprContext *econtext,
			  bool *isNull, bool *isDone);
extern Datum ExecEvalNot(Expr *notclause, ExprContext *econtext, bool *isNull);
extern Datum ExecEvalOr(Expr *orExpr, ExprContext *econtext, bool *isNull);
extern Datum ExecEvalAnd(Expr *andExpr, ExprContext *econtext, bool *isNull);
extern Datum ExecEvalExpr(Node *expression, ExprContext *econtext, bool *isNull,
			  bool *isDone);
extern bool ExecQualClause(Node *clause, ExprContext *econtext);
extern bool ExecQual(List *qual, ExprContext *econtext);
extern int ExecTargetListLength(List *targetlist);
extern TupleTableSlot *ExecProject(ProjectionInfo *projInfo, bool *isDone);

/*
 * prototypes from functions in execScan.c
 */
extern TupleTableSlot *ExecScan(Scan *node, TupleTableSlot* (*accessMtd)());

/*
 * prototypes from functions in execTuples.c
 */
extern TupleTable ExecCreateTupleTable(int initialSize);
extern void ExecDestroyTupleTable(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 bool ExecSlotPolicy(TupleTableSlot *slot);
extern bool ExecSetSlotPolicy(TupleTableSlot *slot, bool shouldFree);
extern TupleDesc ExecSetSlotDescriptor(TupleTableSlot *slot,
				       TupleDesc tupdesc);
extern void ExecSetSlotDescriptorIsNew(TupleTableSlot *slot, bool isNew);
extern TupleDesc ExecSetNewSlotDescriptor(TupleTableSlot *slot,
					  TupleDesc tupdesc);
extern Buffer ExecSetSlotBuffer(TupleTableSlot *slot, Buffer b);
extern void ExecIncrSlotBufferRefcnt(TupleTableSlot *slot);
extern bool TupIsNull(TupleTableSlot* slot);
extern bool ExecSlotDescriptorIsNew(TupleTableSlot *slot);
extern void ExecInitResultTupleSlot(EState *estate, CommonState *commonstate);
extern void ExecInitScanTupleSlot(EState *estate,
				  CommonScanState *commonscanstate);
extern void ExecInitMarkedTupleSlot(EState *estate, MergeJoinState *mergestate);
extern void ExecInitOuterTupleSlot(EState *estate, HashJoinState *hashstate);
extern void ExecInitHashTupleSlot(EState *estate, HashJoinState *hashstate);
extern TupleTableSlot *NodeGetResultTupleSlot(Plan *node);

extern TupleDesc ExecGetTupType(Plan *node);
extern TupleDesc ExecTypeFromTL(List *targetList);

/*
 * prototypes from functions in execTuples.c
 */
extern void ResetTupleCount(void);
extern void DisplayTupleCount(FILE *statfp);
extern void ExecAssignNodeBaseInfo(EState *estate, CommonState *basenode,
				   Plan *parent);
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 ExecFreeResultType(CommonState *commonstate);
extern void ExecAssignProjectionInfo(Plan *node, CommonState *commonstate);
extern void ExecFreeProjectionInfo(CommonState *commonstate);
extern TupleDesc ExecGetScanType(CommonScanState *csstate);
extern void ExecFreeScanType(CommonScanState *csstate);
extern void ExecAssignScanType(CommonScanState	*csstate,
			       TupleDesc tupDesc);
extern void ExecAssignScanTypeFromOuterPlan(Plan *node,
					    CommonScanState *csstate);
extern AttributeTupleForm ExecGetTypeInfo(Relation relDesc);

extern void ExecGetIndexKeyInfo(IndexTupleForm indexTuple, int *numAttsOutP,
		 AttrNumber **attsOutP, FuncIndexInfoPtr fInfoP);
extern void ExecOpenIndices(Oid resultRelationOid,
			    RelationInfo *resultRelationInfo);
extern void ExecCloseIndices(RelationInfo *resultRelationInfo);
extern IndexTuple ExecFormIndexTuple(HeapTuple heapTuple,
	Relation heapRelation, Relation indexRelation, IndexInfo *indexInfo);
extern void ExecInsertIndexTuples(TupleTableSlot *slot, ItemPointer tupleid,
				      EState *estate, bool is_update);


/* ----------------------------------------------------------------
 *	the end
 * ----------------------------------------------------------------
 */

#endif /*  EXECUTOR_H  */
