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https://github.com/postgres/postgres.git
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c7a165adc6
(overlaying low byte of page size) and add HEAP_HASOID bit to t_infomask, per earlier discussion. Simplify scheme for overlaying fields in tuple header (no need for cmax to live in more than one place). Don't try to clear infomask status bits in tqual.c --- not safe to do it there. Don't try to force output table of a SELECT INTO to have OIDs, either. Get rid of unnecessarily complex three-state scheme for TupleDesc.tdhasoids, which has already caused one recent failure. Improve documentation.
211 lines
7.6 KiB
C
211 lines
7.6 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) 1996-2002, 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 1.77 2002/09/02 01:05:06 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(const 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 Tuplestorestate *ExecMakeTableFunctionResult(Expr *funcexpr,
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ExprContext *econtext,
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TupleDesc expectedDesc,
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TupleDesc *returnDesc);
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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, bool hasoid);
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extern void SetChangedParamList(Plan *node, List *newchg);
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typedef struct TupOutputState
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{
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/* use "struct" here to allow forward reference */
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struct AttInMetadata *metadata;
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DestReceiver *destfunc;
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} TupOutputState;
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extern TupOutputState *begin_tup_output_tupdesc(CommandDest dest, TupleDesc tupdesc);
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extern void do_tup_output(TupOutputState *tstate, char **values);
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extern void do_text_output_multiline(TupOutputState *tstate, char *text);
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extern void end_tup_output(TupOutputState *tstate);
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/*
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* Write a single line of text given as a C string.
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*
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* Should only be used with a single-TEXT-attribute tupdesc.
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*/
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#define do_text_output_oneline(tstate, text_to_emit) \
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do { \
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char *values_[1]; \
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values_[0] = (text_to_emit); \
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do_tup_output(tstate, values_); \
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} while (0)
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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 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_vacuum);
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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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