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f9e4f611a1
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 ...
183 lines
6.8 KiB
C
183 lines
6.8 KiB
C
/*-------------------------------------------------------------------------
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*
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* executor.h
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* support for the POSTGRES executor module
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*
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*
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* Portions Copyright (c) 1996-2001, PostgreSQL Global Development Group
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* Portions Copyright (c) 1994, Regents of the University of California
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*
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* $Id: executor.h,v 1.64 2002/05/12 20:10:04 tgl Exp $
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*
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*-------------------------------------------------------------------------
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*/
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#ifndef EXECUTOR_H
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#define EXECUTOR_H
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#include "executor/execdesc.h"
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/* ----------------
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* TupIsNull
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*
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* This is used mainly to detect when there are no more
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* tuples to process.
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* ----------------
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*/
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/* return: true if tuple in slot is NULL, slot is slot to test */
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#define TupIsNull(slot) \
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((slot) == NULL || (slot)->val == NULL)
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/*
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* prototypes from functions in execAmi.c
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*/
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extern void ExecReScan(Plan *node, ExprContext *exprCtxt, Plan *parent);
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extern void ExecMarkPos(Plan *node);
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extern void ExecRestrPos(Plan *node);
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/*
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* prototypes from functions in execJunk.c
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*/
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extern JunkFilter *ExecInitJunkFilter(List *targetList, TupleDesc tupType,
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TupleTableSlot *slot);
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extern void ExecFreeJunkFilter(JunkFilter *junkfilter);
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extern bool ExecGetJunkAttribute(JunkFilter *junkfilter, TupleTableSlot *slot,
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char *attrName, Datum *value, bool *isNull);
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extern HeapTuple ExecRemoveJunk(JunkFilter *junkfilter, TupleTableSlot *slot);
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/*
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* prototypes from functions in execMain.c
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*/
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extern TupleDesc ExecutorStart(QueryDesc *queryDesc, EState *estate);
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extern TupleTableSlot *ExecutorRun(QueryDesc *queryDesc, EState *estate,
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ScanDirection direction, long count);
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extern void ExecutorEnd(QueryDesc *queryDesc, EState *estate);
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extern void ExecConstraints(char *caller, ResultRelInfo *resultRelInfo,
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TupleTableSlot *slot, EState *estate);
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extern TupleTableSlot *EvalPlanQual(EState *estate, Index rti,
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ItemPointer tid);
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/*
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* prototypes from functions in execProcnode.c
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*/
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extern bool ExecInitNode(Plan *node, EState *estate, Plan *parent);
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extern TupleTableSlot *ExecProcNode(Plan *node, Plan *parent);
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extern int ExecCountSlotsNode(Plan *node);
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extern void ExecEndNode(Plan *node, Plan *parent);
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extern TupleDesc ExecGetTupType(Plan *node);
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/*
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* prototypes from functions in execQual.c
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*/
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extern Datum ExecEvalParam(Param *expression, ExprContext *econtext,
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bool *isNull);
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extern Datum GetAttributeByNum(TupleTableSlot *slot, AttrNumber attrno,
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bool *isNull);
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extern Datum GetAttributeByName(TupleTableSlot *slot, char *attname,
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bool *isNull);
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extern Datum ExecMakeFunctionResult(FunctionCachePtr fcache,
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List *arguments,
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ExprContext *econtext,
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bool *isNull,
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ExprDoneCond *isDone);
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extern Datum ExecEvalExpr(Node *expression, ExprContext *econtext,
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bool *isNull, ExprDoneCond *isDone);
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extern Datum ExecEvalExprSwitchContext(Node *expression, ExprContext *econtext,
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bool *isNull, ExprDoneCond *isDone);
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extern bool ExecQual(List *qual, ExprContext *econtext, bool resultForNull);
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extern int ExecTargetListLength(List *targetlist);
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extern int ExecCleanTargetListLength(List *targetlist);
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extern TupleTableSlot *ExecProject(ProjectionInfo *projInfo,
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ExprDoneCond *isDone);
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/*
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* prototypes from functions in execScan.c
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*/
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typedef TupleTableSlot *(*ExecScanAccessMtd) (Scan *node);
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extern TupleTableSlot *ExecScan(Scan *node, ExecScanAccessMtd accessMtd);
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/*
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* prototypes from functions in execTuples.c
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*/
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extern TupleTable ExecCreateTupleTable(int initialSize);
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extern void ExecDropTupleTable(TupleTable table, bool shouldFree);
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extern TupleTableSlot *ExecAllocTableSlot(TupleTable table);
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extern TupleTableSlot *MakeTupleTableSlot(void);
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extern TupleTableSlot *ExecStoreTuple(HeapTuple tuple,
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TupleTableSlot *slot,
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Buffer buffer,
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bool shouldFree);
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extern TupleTableSlot *ExecClearTuple(TupleTableSlot *slot);
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extern void ExecSetSlotDescriptor(TupleTableSlot *slot,
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TupleDesc tupdesc, bool shouldFree);
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extern void ExecSetSlotDescriptorIsNew(TupleTableSlot *slot, bool isNew);
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extern void ExecInitResultTupleSlot(EState *estate, CommonState *commonstate);
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extern void ExecInitScanTupleSlot(EState *estate,
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CommonScanState *commonscanstate);
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extern TupleTableSlot *ExecInitExtraTupleSlot(EState *estate);
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extern TupleTableSlot *ExecInitNullTupleSlot(EState *estate,
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TupleDesc tupType);
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extern TupleDesc ExecTypeFromTL(List *targetList);
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extern void SetChangedParamList(Plan *node, List *newchg);
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/*
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* prototypes from functions in execUtils.c
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*/
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extern void ResetTupleCount(void);
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extern void ExecAssignExprContext(EState *estate, CommonState *commonstate);
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extern void ExecAssignResultType(CommonState *commonstate,
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TupleDesc tupDesc, bool shouldFree);
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extern void ExecAssignResultTypeFromOuterPlan(Plan *node,
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CommonState *commonstate);
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extern void ExecAssignResultTypeFromTL(Plan *node, CommonState *commonstate);
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extern TupleDesc ExecGetResultType(CommonState *commonstate);
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extern void ExecAssignProjectionInfo(Plan *node, CommonState *commonstate);
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extern void ExecFreeProjectionInfo(CommonState *commonstate);
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extern void ExecFreeExprContext(CommonState *commonstate);
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extern TupleDesc ExecGetScanType(CommonScanState *csstate);
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extern void ExecAssignScanType(CommonScanState *csstate,
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TupleDesc tupDesc, bool shouldFree);
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extern void ExecAssignScanTypeFromOuterPlan(Plan *node,
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CommonScanState *csstate);
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extern Form_pg_attribute ExecGetTypeInfo(Relation relDesc);
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extern ExprContext *MakeExprContext(TupleTableSlot *slot,
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MemoryContext queryContext);
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extern void FreeExprContext(ExprContext *econtext);
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#define ResetExprContext(econtext) \
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MemoryContextReset((econtext)->ecxt_per_tuple_memory)
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extern ExprContext *MakePerTupleExprContext(EState *estate);
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/* Get an EState's per-output-tuple exprcontext, making it if first use */
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#define GetPerTupleExprContext(estate) \
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((estate)->es_per_tuple_exprcontext ? \
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(estate)->es_per_tuple_exprcontext : \
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MakePerTupleExprContext(estate))
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#define GetPerTupleMemoryContext(estate) \
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(GetPerTupleExprContext(estate)->ecxt_per_tuple_memory)
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/* Reset an EState's per-output-tuple exprcontext, if one's been created */
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#define ResetPerTupleExprContext(estate) \
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do { \
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if ((estate)->es_per_tuple_exprcontext) \
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ResetExprContext((estate)->es_per_tuple_exprcontext); \
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} while (0)
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extern void ExecOpenIndices(ResultRelInfo *resultRelInfo);
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extern void ExecCloseIndices(ResultRelInfo *resultRelInfo);
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extern void ExecInsertIndexTuples(TupleTableSlot *slot, ItemPointer tupleid,
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EState *estate, bool is_update);
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extern void RegisterExprContextCallback(ExprContext *econtext,
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ExprContextCallbackFunction function,
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Datum arg);
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extern void UnregisterExprContextCallback(ExprContext *econtext,
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ExprContextCallbackFunction function,
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Datum arg);
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#endif /* EXECUTOR_H */
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