executor.h

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/*-------------------------------------------------------------------------
 *
 * executor.h
 *    support for the POSTGRES executor module
 *
 *
 * Portions Copyright (c) 1996-2025, PostgreSQL Global Development Group
 * Portions Copyright (c) 1994, Regents of the University of California
 *
 * src/include/executor/executor.h
 *
 *-------------------------------------------------------------------------
 */
#ifndef EXECUTOR_H
#define EXECUTOR_H
 
#include "executor/execdesc.h"
#include "fmgr.h"
#include "nodes/lockoptions.h"
#include "nodes/parsenodes.h"
#include "utils/memutils.h"
#include "utils/plancache.h"
 
 
/*
 * The "eflags" argument to ExecutorStart and the various ExecInitNode
 * routines is a bitwise OR of the following flag bits, which tell the
 * called plan node what to expect.  Note that the flags will get modified
 * as they are passed down the plan tree, since an upper node may require
 * functionality in its subnode not demanded of the plan as a whole
 * (example: MergeJoin requires mark/restore capability in its inner input),
 * or an upper node may shield its input from some functionality requirement
 * (example: Materialize shields its input from needing to do backward scan).
 *
 * EXPLAIN_ONLY indicates that the plan tree is being initialized just so
 * EXPLAIN can print it out; it will not be run.  Hence, no side-effects
 * of startup should occur.  However, error checks (such as permission checks)
 * should be performed.
 *
 * EXPLAIN_GENERIC can only be used together with EXPLAIN_ONLY.  It indicates
 * that a generic plan is being shown using EXPLAIN (GENERIC_PLAN), which
 * means that missing parameter values must be tolerated.  Currently, the only
 * effect is to suppress execution-time partition pruning.
 *
 * REWIND indicates that the plan node should try to efficiently support
 * rescans without parameter changes.  (Nodes must support ExecReScan calls
 * in any case, but if this flag was not given, they are at liberty to do it
 * through complete recalculation.  Note that a parameter change forces a
 * full recalculation in any case.)
 *
 * BACKWARD indicates that the plan node must respect the es_direction flag.
 * When this is not passed, the plan node will only be run forwards.
 *
 * MARK indicates that the plan node must support Mark/Restore calls.
 * When this is not passed, no Mark/Restore will occur.
 *
 * SKIP_TRIGGERS tells ExecutorStart/ExecutorFinish to skip calling
 * AfterTriggerBeginQuery/AfterTriggerEndQuery.  This does not necessarily
 * mean that the plan can't queue any AFTER triggers; just that the caller
 * is responsible for there being a trigger context for them to be queued in.
 *
 * WITH_NO_DATA indicates that we are performing REFRESH MATERIALIZED VIEW
 * ... WITH NO DATA.  Currently, the only effect is to suppress errors about
 * scanning unpopulated materialized views.
 */
#define EXEC_FLAG_EXPLAIN_ONLY      0x0001  /* EXPLAIN, no ANALYZE */
#define EXEC_FLAG_EXPLAIN_GENERIC   0x0002  /* EXPLAIN (GENERIC_PLAN) */
#define EXEC_FLAG_REWIND            0x0004  /* need efficient rescan */
#define EXEC_FLAG_BACKWARD          0x0008  /* need backward scan */
#define EXEC_FLAG_MARK              0x0010  /* need mark/restore */
#define EXEC_FLAG_SKIP_TRIGGERS     0x0020  /* skip AfterTrigger setup */
#define EXEC_FLAG_WITH_NO_DATA      0x0040  /* REFRESH ... WITH NO DATA */
 
 
/* Hook for plugins to get control in ExecutorStart() */
typedef bool (*ExecutorStart_hook_type) (QueryDesc *queryDesc, int eflags);
extern PGDLLIMPORT ExecutorStart_hook_type ExecutorStart_hook;
 
/* Hook for plugins to get control in ExecutorRun() */
typedef void (*ExecutorRun_hook_type) (QueryDesc *queryDesc,
                                       ScanDirection direction,
                                       uint64 count);
extern PGDLLIMPORT ExecutorRun_hook_type ExecutorRun_hook;
 
/* Hook for plugins to get control in ExecutorFinish() */
typedef void (*ExecutorFinish_hook_type) (QueryDesc *queryDesc);
extern PGDLLIMPORT ExecutorFinish_hook_type ExecutorFinish_hook;
 
/* Hook for plugins to get control in ExecutorEnd() */
typedef void (*ExecutorEnd_hook_type) (QueryDesc *queryDesc);
extern PGDLLIMPORT ExecutorEnd_hook_type ExecutorEnd_hook;
 
/* Hook for plugins to get control in ExecCheckPermissions() */
typedef bool (*ExecutorCheckPerms_hook_type) (List *rangeTable,
                                              List *rtePermInfos,
                                              bool ereport_on_violation);
extern PGDLLIMPORT ExecutorCheckPerms_hook_type ExecutorCheckPerms_hook;
 
 
/*
 * prototypes from functions in execAmi.c
 */
struct Path;                    /* avoid including pathnodes.h here */
 
extern void ExecReScan(PlanState *node);
extern void ExecMarkPos(PlanState *node);
extern void ExecRestrPos(PlanState *node);
extern bool ExecSupportsMarkRestore(struct Path *pathnode);
extern bool ExecSupportsBackwardScan(Plan *node);
extern bool ExecMaterializesOutput(NodeTag plantype);
 
/*
 * prototypes from functions in execCurrent.c
 */
extern bool execCurrentOf(CurrentOfExpr *cexpr,
                          ExprContext *econtext,
                          Oid table_oid,
                          ItemPointer current_tid);
 
/*
 * prototypes from functions in execGrouping.c
 */
extern ExprState *execTuplesMatchPrepare(TupleDesc desc,
                                         int numCols,
                                         const AttrNumber *keyColIdx,
                                         const Oid *eqOperators,
                                         const Oid *collations,
                                         PlanState *parent);
extern void execTuplesHashPrepare(int numCols,
                                  const Oid *eqOperators,
                                  Oid **eqFuncOids,
                                  FmgrInfo **hashFunctions);
extern TupleHashTable BuildTupleHashTable(PlanState *parent,
                                          TupleDesc inputDesc,
                                          const TupleTableSlotOps *inputOps,
                                          int numCols,
                                          AttrNumber *keyColIdx,
                                          const Oid *eqfuncoids,
                                          FmgrInfo *hashfunctions,
                                          Oid *collations,
                                          long nbuckets,
                                          Size additionalsize,
                                          MemoryContext metacxt,
                                          MemoryContext tablecxt,
                                          MemoryContext tempcxt,
                                          bool use_variable_hash_iv);
extern TupleHashEntry LookupTupleHashEntry(TupleHashTable hashtable,
                                           TupleTableSlot *slot,
                                           bool *isnew, uint32 *hash);
extern uint32 TupleHashTableHash(TupleHashTable hashtable,
                                 TupleTableSlot *slot);
extern TupleHashEntry LookupTupleHashEntryHash(TupleHashTable hashtable,
                                               TupleTableSlot *slot,
                                               bool *isnew, uint32 hash);
extern TupleHashEntry FindTupleHashEntry(TupleHashTable hashtable,
                                         TupleTableSlot *slot,
                                         ExprState *eqcomp,
                                         ExprState *hashexpr);
extern void ResetTupleHashTable(TupleHashTable hashtable);
 
#ifndef FRONTEND
/*
 * Return size of the hash bucket. Useful for estimating memory usage.
 */
static inline size_t
TupleHashEntrySize(void)
{
    return sizeof(TupleHashEntryData);
}
 
/*
 * Return tuple from hash entry.
 */
static inline MinimalTuple
TupleHashEntryGetTuple(TupleHashEntry entry)
{
    return entry->firstTuple;
}
 
/*
 * Get a pointer into the additional space allocated for this entry. The
 * memory will be maxaligned and zeroed.
 *
 * The amount of space available is the additionalsize requested in the call
 * to BuildTupleHashTable(). If additionalsize was specified as zero, return
 * NULL.
 */
static inline void *
TupleHashEntryGetAdditional(TupleHashTable hashtable, TupleHashEntry entry)
{
    if (hashtable->additionalsize > 0)
        return (char *) entry->firstTuple - hashtable->additionalsize;
    else
        return NULL;
}
#endif
 
/*
 * prototypes from functions in execJunk.c
 */
extern JunkFilter *ExecInitJunkFilter(List *targetList,
                                      TupleTableSlot *slot);
extern JunkFilter *ExecInitJunkFilterConversion(List *targetList,
                                                TupleDesc cleanTupType,
                                                TupleTableSlot *slot);
extern AttrNumber ExecFindJunkAttribute(JunkFilter *junkfilter,
                                        const char *attrName);
extern AttrNumber ExecFindJunkAttributeInTlist(List *targetlist,
                                               const char *attrName);
extern TupleTableSlot *ExecFilterJunk(JunkFilter *junkfilter,
                                      TupleTableSlot *slot);
 
/*
 * ExecGetJunkAttribute
 *
 * Given a junk filter's input tuple (slot) and a junk attribute's number
 * previously found by ExecFindJunkAttribute, extract & return the value and
 * isNull flag of the attribute.
 */
#ifndef FRONTEND
static inline Datum
ExecGetJunkAttribute(TupleTableSlot *slot, AttrNumber attno, bool *isNull)
{
    Assert(attno > 0);
    return slot_getattr(slot, attno, isNull);
}
#endif
 
/*
 * prototypes from functions in execMain.c
 */
extern bool ExecutorStart(QueryDesc *queryDesc, int eflags);
extern void ExecutorStartCachedPlan(QueryDesc *queryDesc, int eflags,
                                    CachedPlanSource *plansource,
                                    int query_index);
extern bool standard_ExecutorStart(QueryDesc *queryDesc, int eflags);
extern void ExecutorRun(QueryDesc *queryDesc,
                        ScanDirection direction, uint64 count);
extern void standard_ExecutorRun(QueryDesc *queryDesc,
                                 ScanDirection direction, uint64 count);
extern void ExecutorFinish(QueryDesc *queryDesc);
extern void standard_ExecutorFinish(QueryDesc *queryDesc);
extern void ExecutorEnd(QueryDesc *queryDesc);
extern void standard_ExecutorEnd(QueryDesc *queryDesc);
extern void ExecutorRewind(QueryDesc *queryDesc);
extern bool ExecCheckPermissions(List *rangeTable,
                                 List *rteperminfos, bool ereport_on_violation);
extern void CheckValidResultRel(ResultRelInfo *resultRelInfo, CmdType operation,
                                List *mergeActions);
extern void InitResultRelInfo(ResultRelInfo *resultRelInfo,
                              Relation resultRelationDesc,
                              Index resultRelationIndex,
                              ResultRelInfo *partition_root_rri,
                              int instrument_options);
extern ResultRelInfo *ExecGetTriggerResultRel(EState *estate, Oid relid,
                                              ResultRelInfo *rootRelInfo);
extern List *ExecGetAncestorResultRels(EState *estate, ResultRelInfo *resultRelInfo);
extern void ExecConstraints(ResultRelInfo *resultRelInfo,
                            TupleTableSlot *slot, EState *estate);
extern AttrNumber ExecRelGenVirtualNotNull(ResultRelInfo *resultRelInfo,
                                           TupleTableSlot *slot,
                                           EState *estate,
                                           List *notnull_virtual_attrs);
extern bool ExecPartitionCheck(ResultRelInfo *resultRelInfo,
                               TupleTableSlot *slot, EState *estate, bool emitError);
extern void ExecPartitionCheckEmitError(ResultRelInfo *resultRelInfo,
                                        TupleTableSlot *slot, EState *estate);
extern void ExecWithCheckOptions(WCOKind kind, ResultRelInfo *resultRelInfo,
                                 TupleTableSlot *slot, EState *estate);
extern char *ExecBuildSlotValueDescription(Oid reloid, TupleTableSlot *slot,
                                           TupleDesc tupdesc,
                                           Bitmapset *modifiedCols,
                                           int maxfieldlen);
extern LockTupleMode ExecUpdateLockMode(EState *estate, ResultRelInfo *relinfo);
extern ExecRowMark *ExecFindRowMark(EState *estate, Index rti, bool missing_ok);
extern ExecAuxRowMark *ExecBuildAuxRowMark(ExecRowMark *erm, List *targetlist);
extern TupleTableSlot *EvalPlanQual(EPQState *epqstate, Relation relation,
                                    Index rti, TupleTableSlot *inputslot);
extern void EvalPlanQualInit(EPQState *epqstate, EState *parentestate,
                             Plan *subplan, List *auxrowmarks,
                             int epqParam, List *resultRelations);
extern void EvalPlanQualSetPlan(EPQState *epqstate,
                                Plan *subplan, List *auxrowmarks);
extern TupleTableSlot *EvalPlanQualSlot(EPQState *epqstate,
                                        Relation relation, Index rti);
 
#define EvalPlanQualSetSlot(epqstate, slot)  ((epqstate)->origslot = (slot))
extern bool EvalPlanQualFetchRowMark(EPQState *epqstate, Index rti, TupleTableSlot *slot);
extern TupleTableSlot *EvalPlanQualNext(EPQState *epqstate);
extern void EvalPlanQualBegin(EPQState *epqstate);
extern void EvalPlanQualEnd(EPQState *epqstate);
 
/*
 * functions in execProcnode.c
 */
extern PlanState *ExecInitNode(Plan *node, EState *estate, int eflags);
extern void ExecSetExecProcNode(PlanState *node, ExecProcNodeMtd function);
extern Node *MultiExecProcNode(PlanState *node);
extern void ExecEndNode(PlanState *node);
extern void ExecShutdownNode(PlanState *node);
extern void ExecSetTupleBound(int64 tuples_needed, PlanState *child_node);
 
/*
 * Is the CachedPlan in es_cachedplan still valid?
 *
 * Called from InitPlan() because invalidation messages that affect the plan
 * might be received after locks have been taken on runtime-prunable relations.
 * The caller should take appropriate action if the plan has become invalid.
 */
static inline bool
ExecPlanStillValid(EState *estate)
{
    return estate->es_cachedplan == NULL ? true :
        CachedPlanValid(estate->es_cachedplan);
}
 
/*
 * Locks are needed only if running a cached plan that might contain unlocked
 * relations, such as a reused generic plan.
 */
static inline bool
ExecShouldLockRelations(EState *estate)
{
    return estate->es_cachedplan == NULL ? false :
        CachedPlanRequiresLocking(estate->es_cachedplan);
}
 
/* ----------------------------------------------------------------
 *      ExecProcNode
 *
 *      Execute the given node to return a(nother) tuple.
 * ----------------------------------------------------------------
 */
#ifndef FRONTEND
static inline TupleTableSlot *
ExecProcNode(PlanState *node)
{
    if (node->chgParam != NULL) /* something changed? */
        ExecReScan(node);       /* let ReScan handle this */
 
    return node->ExecProcNode(node);
}
#endif
 
/*
 * prototypes from functions in execExpr.c
 */
extern ExprState *ExecInitExpr(Expr *node, PlanState *parent);
extern ExprState *ExecInitExprWithParams(Expr *node, ParamListInfo ext_params);
extern ExprState *ExecInitQual(List *qual, PlanState *parent);
extern ExprState *ExecInitCheck(List *qual, PlanState *parent);
extern List *ExecInitExprList(List *nodes, PlanState *parent);
extern ExprState *ExecBuildAggTrans(AggState *aggstate, struct AggStatePerPhaseData *phase,
                                    bool doSort, bool doHash, bool nullcheck);
extern ExprState *ExecBuildHash32FromAttrs(TupleDesc desc,
                                           const TupleTableSlotOps *ops,
                                           FmgrInfo *hashfunctions,
                                           Oid *collations,
                                           int numCols,
                                           AttrNumber *keyColIdx,
                                           PlanState *parent,
                                           uint32 init_value);
extern ExprState *ExecBuildHash32Expr(TupleDesc desc,
                                      const TupleTableSlotOps *ops,
                                      const Oid *hashfunc_oids,
                                      const List *collations,
                                      const List *hash_exprs,
                                      const bool *opstrict, PlanState *parent,
                                      uint32 init_value, bool keep_nulls);
extern ExprState *ExecBuildGroupingEqual(TupleDesc ldesc, TupleDesc rdesc,
                                         const TupleTableSlotOps *lops, const TupleTableSlotOps *rops,
                                         int numCols,
                                         const AttrNumber *keyColIdx,
                                         const Oid *eqfunctions,
                                         const Oid *collations,
                                         PlanState *parent);
extern ExprState *ExecBuildParamSetEqual(TupleDesc desc,
                                         const TupleTableSlotOps *lops,
                                         const TupleTableSlotOps *rops,
                                         const Oid *eqfunctions,
                                         const Oid *collations,
                                         const List *param_exprs,
                                         PlanState *parent);
extern ProjectionInfo *ExecBuildProjectionInfo(List *targetList,
                                               ExprContext *econtext,
                                               TupleTableSlot *slot,
                                               PlanState *parent,
                                               TupleDesc inputDesc);
extern ProjectionInfo *ExecBuildUpdateProjection(List *targetList,
                                                 bool evalTargetList,
                                                 List *targetColnos,
                                                 TupleDesc relDesc,
                                                 ExprContext *econtext,
                                                 TupleTableSlot *slot,
                                                 PlanState *parent);
extern ExprState *ExecPrepareExpr(Expr *node, EState *estate);
extern ExprState *ExecPrepareQual(List *qual, EState *estate);
extern ExprState *ExecPrepareCheck(List *qual, EState *estate);
extern List *ExecPrepareExprList(List *nodes, EState *estate);
 
/*
 * ExecEvalExpr
 *
 * Evaluate expression identified by "state" in the execution context
 * given by "econtext".  *isNull is set to the is-null flag for the result,
 * and the Datum value is the function result.
 *
 * The caller should already have switched into the temporary memory
 * context econtext->ecxt_per_tuple_memory.  The convenience entry point
 * ExecEvalExprSwitchContext() is provided for callers who don't prefer to
 * do the switch in an outer loop.
 */
#ifndef FRONTEND
static inline Datum
ExecEvalExpr(ExprState *state,
             ExprContext *econtext,
             bool *isNull)
{
    return state->evalfunc(state, econtext, isNull);
}
#endif
 
/*
 * ExecEvalExprNoReturn
 *
 * Like ExecEvalExpr(), but for cases where no return value is expected,
 * because the side-effects of expression evaluation are what's desired. This
 * is e.g. used for projection and aggregate transition computation.
 
 * Evaluate expression identified by "state" in the execution context
 * given by "econtext".
 *
 * The caller should already have switched into the temporary memory context
 * econtext->ecxt_per_tuple_memory.  The convenience entry point
 * ExecEvalExprNoReturnSwitchContext() is provided for callers who don't
 * prefer to do the switch in an outer loop.
 */
#ifndef FRONTEND
static inline void
ExecEvalExprNoReturn(ExprState *state,
                     ExprContext *econtext)
{
    PG_USED_FOR_ASSERTS_ONLY Datum retDatum;
 
    retDatum = state->evalfunc(state, econtext, NULL);
 
    Assert(retDatum == (Datum) 0);
}
#endif
 
/*
 * ExecEvalExprSwitchContext
 *
 * Same as ExecEvalExpr, but get into the right allocation context explicitly.
 */
#ifndef FRONTEND
static inline Datum
ExecEvalExprSwitchContext(ExprState *state,
                          ExprContext *econtext,
                          bool *isNull)
{
    Datum       retDatum;
    MemoryContext oldContext;
 
    oldContext = MemoryContextSwitchTo(econtext->ecxt_per_tuple_memory);
    retDatum = state->evalfunc(state, econtext, isNull);
    MemoryContextSwitchTo(oldContext);
    return retDatum;
}
#endif
 
/*
 * ExecEvalExprNoReturnSwitchContext
 *
 * Same as ExecEvalExprNoReturn, but get into the right allocation context
 * explicitly.
 */
#ifndef FRONTEND
static inline void
ExecEvalExprNoReturnSwitchContext(ExprState *state,
                                  ExprContext *econtext)
{
    MemoryContext oldContext;
 
    oldContext = MemoryContextSwitchTo(econtext->ecxt_per_tuple_memory);
    ExecEvalExprNoReturn(state, econtext);
    MemoryContextSwitchTo(oldContext);
}
#endif
 
/*
 * ExecProject
 *
 * Projects a tuple based on projection info and stores it in the slot passed
 * to ExecBuildProjectionInfo().
 *
 * Note: the result is always a virtual tuple; therefore it may reference
 * the contents of the exprContext's scan tuples and/or temporary results
 * constructed in the exprContext.  If the caller wishes the result to be
 * valid longer than that data will be valid, he must call ExecMaterializeSlot
 * on the result slot.
 */
#ifndef FRONTEND
static inline TupleTableSlot *
ExecProject(ProjectionInfo *projInfo)
{
    ExprContext *econtext = projInfo->pi_exprContext;
    ExprState  *state = &projInfo->pi_state;
    TupleTableSlot *slot = state->resultslot;
 
    /*
     * Clear any former contents of the result slot.  This makes it safe for
     * us to use the slot's Datum/isnull arrays as workspace.
     */
    ExecClearTuple(slot);
 
    /* Run the expression */
    ExecEvalExprNoReturnSwitchContext(state, econtext);
 
    /*
     * Successfully formed a result row.  Mark the result slot as containing a
     * valid virtual tuple (inlined version of ExecStoreVirtualTuple()).
     */
    slot->tts_flags &= ~TTS_FLAG_EMPTY;
    slot->tts_nvalid = slot->tts_tupleDescriptor->natts;
 
    return slot;
}
#endif
 
/*
 * ExecQual - evaluate a qual prepared with ExecInitQual (possibly via
 * ExecPrepareQual).  Returns true if qual is satisfied, else false.
 *
 * Note: ExecQual used to have a third argument "resultForNull".  The
 * behavior of this function now corresponds to resultForNull == false.
 * If you want the resultForNull == true behavior, see ExecCheck.
 */
#ifndef FRONTEND
static inline bool
ExecQual(ExprState *state, ExprContext *econtext)
{
    Datum       ret;
    bool        isnull;
 
    /* short-circuit (here and in ExecInitQual) for empty restriction list */
    if (state == NULL)
        return true;
 
    /* verify that expression was compiled using ExecInitQual */
    Assert(state->flags & EEO_FLAG_IS_QUAL);
 
    ret = ExecEvalExprSwitchContext(state, econtext, &isnull);
 
    /* EEOP_QUAL should never return NULL */
    Assert(!isnull);
 
    return DatumGetBool(ret);
}
#endif
 
/*
 * ExecQualAndReset() - evaluate qual with ExecQual() and reset expression
 * context.
 */
#ifndef FRONTEND
static inline bool
ExecQualAndReset(ExprState *state, ExprContext *econtext)
{
    bool        ret = ExecQual(state, econtext);
 
    /* inline ResetExprContext, to avoid ordering issue in this file */
    MemoryContextReset(econtext->ecxt_per_tuple_memory);
    return ret;
}
#endif
 
extern bool ExecCheck(ExprState *state, ExprContext *econtext);
 
/*
 * prototypes from functions in execSRF.c
 */
extern SetExprState *ExecInitTableFunctionResult(Expr *expr,
                                                 ExprContext *econtext, PlanState *parent);
extern Tuplestorestate *ExecMakeTableFunctionResult(SetExprState *setexpr,
                                                    ExprContext *econtext,
                                                    MemoryContext argContext,
                                                    TupleDesc expectedDesc,
                                                    bool randomAccess);
extern SetExprState *ExecInitFunctionResultSet(Expr *expr,
                                               ExprContext *econtext, PlanState *parent);
extern Datum ExecMakeFunctionResultSet(SetExprState *fcache,
                                       ExprContext *econtext,
                                       MemoryContext argContext,
                                       bool *isNull,
                                       ExprDoneCond *isDone);
 
/*
 * prototypes from functions in execScan.c
 */
typedef TupleTableSlot *(*ExecScanAccessMtd) (ScanState *node);
typedef bool (*ExecScanRecheckMtd) (ScanState *node, TupleTableSlot *slot);
 
extern TupleTableSlot *ExecScan(ScanState *node, ExecScanAccessMtd accessMtd,
                                ExecScanRecheckMtd recheckMtd);
extern void ExecAssignScanProjectionInfo(ScanState *node);
extern void ExecAssignScanProjectionInfoWithVarno(ScanState *node, int varno);
extern void ExecScanReScan(ScanState *node);
 
/*
 * prototypes from functions in execTuples.c
 */
extern void ExecInitResultTypeTL(PlanState *planstate);
extern void ExecInitResultSlot(PlanState *planstate,
                               const TupleTableSlotOps *tts_ops);
extern void ExecInitResultTupleSlotTL(PlanState *planstate,
                                      const TupleTableSlotOps *tts_ops);
extern void ExecInitScanTupleSlot(EState *estate, ScanState *scanstate,
                                  TupleDesc tupledesc,
                                  const TupleTableSlotOps *tts_ops);
extern TupleTableSlot *ExecInitExtraTupleSlot(EState *estate,
                                              TupleDesc tupledesc,
                                              const TupleTableSlotOps *tts_ops);
extern TupleTableSlot *ExecInitNullTupleSlot(EState *estate, TupleDesc tupType,
                                             const TupleTableSlotOps *tts_ops);
extern TupleDesc ExecTypeFromTL(List *targetList);
extern TupleDesc ExecCleanTypeFromTL(List *targetList);
extern TupleDesc ExecTypeFromExprList(List *exprList);
extern void ExecTypeSetColNames(TupleDesc typeInfo, List *namesList);
extern void UpdateChangedParamSet(PlanState *node, Bitmapset *newchg);
 
typedef struct TupOutputState
{
    TupleTableSlot *slot;
    DestReceiver *dest;
} TupOutputState;
 
extern TupOutputState *begin_tup_output_tupdesc(DestReceiver *dest,
                                                TupleDesc tupdesc,
                                                const TupleTableSlotOps *tts_ops);
extern void do_tup_output(TupOutputState *tstate, const Datum *values, const bool *isnull);
extern void do_text_output_multiline(TupOutputState *tstate, const char *txt);
extern void end_tup_output(TupOutputState *tstate);
 
/*
 * Write a single line of text given as a C string.
 *
 * Should only be used with a single-TEXT-attribute tupdesc.
 */
#define do_text_output_oneline(tstate, str_to_emit) \
    do { \
        Datum   values_[1]; \
        bool    isnull_[1]; \
        values_[0] = PointerGetDatum(cstring_to_text(str_to_emit)); \
        isnull_[0] = false; \
        do_tup_output(tstate, values_, isnull_); \
        pfree(DatumGetPointer(values_[0])); \
    } while (0)
 
 
/*
 * prototypes from functions in execUtils.c
 */
extern EState *CreateExecutorState(void);
extern void FreeExecutorState(EState *estate);
extern ExprContext *CreateExprContext(EState *estate);
extern ExprContext *CreateWorkExprContext(EState *estate);
extern ExprContext *CreateStandaloneExprContext(void);
extern void FreeExprContext(ExprContext *econtext, bool isCommit);
extern void ReScanExprContext(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 ExecAssignExprContext(EState *estate, PlanState *planstate);
extern TupleDesc ExecGetResultType(PlanState *planstate);
extern const TupleTableSlotOps *ExecGetResultSlotOps(PlanState *planstate,
                                                     bool *isfixed);
extern const TupleTableSlotOps *ExecGetCommonSlotOps(PlanState **planstates,
                                                     int nplans);
extern const TupleTableSlotOps *ExecGetCommonChildSlotOps(PlanState *ps);
extern void ExecAssignProjectionInfo(PlanState *planstate,
                                     TupleDesc inputDesc);
extern void ExecConditionalAssignProjectionInfo(PlanState *planstate,
                                                TupleDesc inputDesc, int varno);
extern void ExecAssignScanType(ScanState *scanstate, TupleDesc tupDesc);
extern void ExecCreateScanSlotFromOuterPlan(EState *estate,
                                            ScanState *scanstate,
                                            const TupleTableSlotOps *tts_ops);
 
extern bool ExecRelationIsTargetRelation(EState *estate, Index scanrelid);
 
extern Relation ExecOpenScanRelation(EState *estate, Index scanrelid, int eflags);
 
extern void ExecInitRangeTable(EState *estate, List *rangeTable, List *permInfos,
                               Bitmapset *unpruned_relids);
extern void ExecCloseRangeTableRelations(EState *estate);
extern void ExecCloseResultRelations(EState *estate);
 
static inline RangeTblEntry *
exec_rt_fetch(Index rti, EState *estate)
{
    return (RangeTblEntry *) list_nth(estate->es_range_table, rti - 1);
}
 
extern Relation ExecGetRangeTableRelation(EState *estate, Index rti,
                                          bool isResultRel);
extern void ExecInitResultRelation(EState *estate, ResultRelInfo *resultRelInfo,
                                   Index rti);
 
extern int  executor_errposition(EState *estate, int location);
 
extern void RegisterExprContextCallback(ExprContext *econtext,
                                        ExprContextCallbackFunction function,
                                        Datum arg);
extern void UnregisterExprContextCallback(ExprContext *econtext,
                                          ExprContextCallbackFunction function,
                                          Datum arg);
 
extern Datum GetAttributeByName(HeapTupleHeader tuple, const char *attname,
                                bool *isNull);
extern Datum GetAttributeByNum(HeapTupleHeader tuple, AttrNumber attrno,
                               bool *isNull);
 
extern int  ExecTargetListLength(List *targetlist);
extern int  ExecCleanTargetListLength(List *targetlist);
 
extern TupleTableSlot *ExecGetTriggerOldSlot(EState *estate, ResultRelInfo *relInfo);
extern TupleTableSlot *ExecGetTriggerNewSlot(EState *estate, ResultRelInfo *relInfo);
extern TupleTableSlot *ExecGetReturningSlot(EState *estate, ResultRelInfo *relInfo);
extern TupleTableSlot *ExecGetAllNullSlot(EState *estate, ResultRelInfo *relInfo);
extern TupleConversionMap *ExecGetChildToRootMap(ResultRelInfo *resultRelInfo);
extern TupleConversionMap *ExecGetRootToChildMap(ResultRelInfo *resultRelInfo, EState *estate);
 
extern Oid  ExecGetResultRelCheckAsUser(ResultRelInfo *relInfo, EState *estate);
extern Bitmapset *ExecGetInsertedCols(ResultRelInfo *relinfo, EState *estate);
extern Bitmapset *ExecGetUpdatedCols(ResultRelInfo *relinfo, EState *estate);
extern Bitmapset *ExecGetExtraUpdatedCols(ResultRelInfo *relinfo, EState *estate);
extern Bitmapset *ExecGetAllUpdatedCols(ResultRelInfo *relinfo, EState *estate);
 
/*
 * prototypes from functions in execIndexing.c
 */
extern void ExecOpenIndices(ResultRelInfo *resultRelInfo, bool speculative);
extern void ExecCloseIndices(ResultRelInfo *resultRelInfo);
extern List *ExecInsertIndexTuples(ResultRelInfo *resultRelInfo,
                                   TupleTableSlot *slot, EState *estate,
                                   bool update,
                                   bool noDupErr,
                                   bool *specConflict, List *arbiterIndexes,
                                   bool onlySummarizing);
extern bool ExecCheckIndexConstraints(ResultRelInfo *resultRelInfo,
                                      TupleTableSlot *slot,
                                      EState *estate, ItemPointer conflictTid,
                                      ItemPointer tupleid,
                                      List *arbiterIndexes);
extern void check_exclusion_constraint(Relation heap, Relation index,
                                       IndexInfo *indexInfo,
                                       ItemPointer tupleid,
                                       const Datum *values, const bool *isnull,
                                       EState *estate, bool newIndex);
 
/*
 * prototypes from functions in execReplication.c
 */
extern bool RelationFindReplTupleByIndex(Relation rel, Oid idxoid,
                                         LockTupleMode lockmode,
                                         TupleTableSlot *searchslot,
                                         TupleTableSlot *outslot);
extern bool RelationFindReplTupleSeq(Relation rel, LockTupleMode lockmode,
                                     TupleTableSlot *searchslot, TupleTableSlot *outslot);
 
extern void ExecSimpleRelationInsert(ResultRelInfo *resultRelInfo,
                                     EState *estate, TupleTableSlot *slot);
extern void ExecSimpleRelationUpdate(ResultRelInfo *resultRelInfo,
                                     EState *estate, EPQState *epqstate,
                                     TupleTableSlot *searchslot, TupleTableSlot *slot);
extern void ExecSimpleRelationDelete(ResultRelInfo *resultRelInfo,
                                     EState *estate, EPQState *epqstate,
                                     TupleTableSlot *searchslot);
extern void CheckCmdReplicaIdentity(Relation rel, CmdType cmd);
 
extern void CheckSubscriptionRelkind(char relkind, const char *nspname,
                                     const char *relname);
 
/*
 * prototypes from functions in nodeModifyTable.c
 */
extern TupleTableSlot *ExecGetUpdateNewTuple(ResultRelInfo *relinfo,
                                             TupleTableSlot *planSlot,
                                             TupleTableSlot *oldSlot);
extern ResultRelInfo *ExecLookupResultRelByOid(ModifyTableState *node,
                                               Oid resultoid,
                                               bool missing_ok,
                                               bool update_cache);
 
#endif                          /* EXECUTOR_H  */