Adding upstream version 16.2.upstream/16.2

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 2768 insertions, 0 deletions

diff --git a/src/include/nodes/execnodes.h b/src/include/nodes/execnodes.h
new file mode 100644
index 0000000..869465d
--- /dev/null
+++ b/src/include/nodes/execnodes.h
@@ -0,0 +1,2768 @@
+/*-------------------------------------------------------------------------
+ *
+ * execnodes.h
+ *	  definitions for executor state nodes
+ *
+ * Most plan node types declared in plannodes.h have a corresponding
+ * execution-state node type declared here.  An exception is that
+ * expression nodes (subtypes of Expr) are usually represented by steps
+ * of an ExprState, and fully handled within execExpr* - but sometimes
+ * their state needs to be shared with other parts of the executor, as
+ * for example with SubPlanState, which nodeSubplan.c has to modify.
+ *
+ * Node types declared in this file do not have any copy/equal/out/read
+ * support.  (That is currently hard-wired in gen_node_support.pl, rather
+ * than being explicitly represented by pg_node_attr decorations here.)
+ * There is no need for copy, equal, or read support for executor trees.
+ * Output support could be useful for debugging; but there are a lot of
+ * specialized fields that would require custom code, so for now it's
+ * not provided.
+ *
+ *
+ * Portions Copyright (c) 1996-2023, PostgreSQL Global Development Group
+ * Portions Copyright (c) 1994, Regents of the University of California
+ *
+ * src/include/nodes/execnodes.h
+ *
+ *-------------------------------------------------------------------------
+ */
+#ifndef EXECNODES_H
+#define EXECNODES_H
+
+#include "access/tupconvert.h"
+#include "executor/instrument.h"
+#include "fmgr.h"
+#include "lib/ilist.h"
+#include "lib/pairingheap.h"
+#include "nodes/params.h"
+#include "nodes/plannodes.h"
+#include "nodes/tidbitmap.h"
+#include "partitioning/partdefs.h"
+#include "storage/condition_variable.h"
+#include "utils/hsearch.h"
+#include "utils/queryenvironment.h"
+#include "utils/reltrigger.h"
+#include "utils/sharedtuplestore.h"
+#include "utils/snapshot.h"
+#include "utils/sortsupport.h"
+#include "utils/tuplesort.h"
+#include "utils/tuplestore.h"
+
+struct PlanState;				/* forward references in this file */
+struct ParallelHashJoinState;
+struct ExecRowMark;
+struct ExprState;
+struct ExprContext;
+struct RangeTblEntry;			/* avoid including parsenodes.h here */
+struct ExprEvalStep;			/* avoid including execExpr.h everywhere */
+struct CopyMultiInsertBuffer;
+struct LogicalTapeSet;
+
+
+/* ----------------
+ *		ExprState node
+ *
+ * ExprState represents the evaluation state for a whole expression tree.
+ * It contains instructions (in ->steps) to evaluate the expression.
+ * ----------------
+ */
+typedef Datum (*ExprStateEvalFunc) (struct ExprState *expression,
+									struct ExprContext *econtext,
+									bool *isNull);
+
+/* Bits in ExprState->flags (see also execExpr.h for private flag bits): */
+/* expression is for use with ExecQual() */
+#define EEO_FLAG_IS_QUAL					(1 << 0)
+
+typedef struct ExprState
+{
+	NodeTag		type;
+
+	uint8		flags;			/* bitmask of EEO_FLAG_* bits, see above */
+
+	/*
+	 * Storage for result value of a scalar expression, or for individual
+	 * column results within expressions built by ExecBuildProjectionInfo().
+	 */
+#define FIELDNO_EXPRSTATE_RESNULL 2
+	bool		resnull;
+#define FIELDNO_EXPRSTATE_RESVALUE 3
+	Datum		resvalue;
+
+	/*
+	 * If projecting a tuple result, this slot holds the result; else NULL.
+	 */
+#define FIELDNO_EXPRSTATE_RESULTSLOT 4
+	TupleTableSlot *resultslot;
+
+	/*
+	 * Instructions to compute expression's return value.
+	 */
+	struct ExprEvalStep *steps;
+
+	/*
+	 * Function that actually evaluates the expression.  This can be set to
+	 * different values depending on the complexity of the expression.
+	 */
+	ExprStateEvalFunc evalfunc;
+
+	/* original expression tree, for debugging only */
+	Expr	   *expr;
+
+	/* private state for an evalfunc */
+	void	   *evalfunc_private;
+
+	/*
+	 * XXX: following fields only needed during "compilation" (ExecInitExpr);
+	 * could be thrown away afterwards.
+	 */
+
+	int			steps_len;		/* number of steps currently */
+	int			steps_alloc;	/* allocated length of steps array */
+
+#define FIELDNO_EXPRSTATE_PARENT 11
+	struct PlanState *parent;	/* parent PlanState node, if any */
+	ParamListInfo ext_params;	/* for compiling PARAM_EXTERN nodes */
+
+	Datum	   *innermost_caseval;
+	bool	   *innermost_casenull;
+
+	Datum	   *innermost_domainval;
+	bool	   *innermost_domainnull;
+} ExprState;
+
+
+/* ----------------
+ *	  IndexInfo information
+ *
+ *		this struct holds the information needed to construct new index
+ *		entries for a particular index.  Used for both index_build and
+ *		retail creation of index entries.
+ *
+ *		NumIndexAttrs		total number of columns in this index
+ *		NumIndexKeyAttrs	number of key columns in index
+ *		IndexAttrNumbers	underlying-rel attribute numbers used as keys
+ *							(zeroes indicate expressions). It also contains
+ * 							info about included columns.
+ *		Expressions			expr trees for expression entries, or NIL if none
+ *		ExpressionsState	exec state for expressions, or NIL if none
+ *		Predicate			partial-index predicate, or NIL if none
+ *		PredicateState		exec state for predicate, or NIL if none
+ *		ExclusionOps		Per-column exclusion operators, or NULL if none
+ *		ExclusionProcs		Underlying function OIDs for ExclusionOps
+ *		ExclusionStrats		Opclass strategy numbers for ExclusionOps
+ *		UniqueOps			These are like Exclusion*, but for unique indexes
+ *		UniqueProcs
+ *		UniqueStrats
+ *		Unique				is it a unique index?
+ *		OpclassOptions		opclass-specific options, or NULL if none
+ *		ReadyForInserts		is it valid for inserts?
+ *		CheckedUnchanged	IndexUnchanged status determined yet?
+ *		IndexUnchanged		aminsert hint, cached for retail inserts
+ *		Concurrent			are we doing a concurrent index build?
+ *		BrokenHotChain		did we detect any broken HOT chains?
+ *		Summarizing			is it a summarizing index?
+ *		ParallelWorkers		# of workers requested (excludes leader)
+ *		Am					Oid of index AM
+ *		AmCache				private cache area for index AM
+ *		Context				memory context holding this IndexInfo
+ *
+ * ii_Concurrent, ii_BrokenHotChain, and ii_ParallelWorkers are used only
+ * during index build; they're conventionally zeroed otherwise.
+ * ----------------
+ */
+typedef struct IndexInfo
+{
+	NodeTag		type;
+	int			ii_NumIndexAttrs;	/* total number of columns in index */
+	int			ii_NumIndexKeyAttrs;	/* number of key columns in index */
+	AttrNumber	ii_IndexAttrNumbers[INDEX_MAX_KEYS];
+	List	   *ii_Expressions; /* list of Expr */
+	List	   *ii_ExpressionsState;	/* list of ExprState */
+	List	   *ii_Predicate;	/* list of Expr */
+	ExprState  *ii_PredicateState;
+	Oid		   *ii_ExclusionOps;	/* array with one entry per column */
+	Oid		   *ii_ExclusionProcs;	/* array with one entry per column */
+	uint16	   *ii_ExclusionStrats; /* array with one entry per column */
+	Oid		   *ii_UniqueOps;	/* array with one entry per column */
+	Oid		   *ii_UniqueProcs; /* array with one entry per column */
+	uint16	   *ii_UniqueStrats;	/* array with one entry per column */
+	Datum	   *ii_OpclassOptions;	/* array with one entry per column */
+	bool		ii_Unique;
+	bool		ii_NullsNotDistinct;
+	bool		ii_ReadyForInserts;
+	bool		ii_CheckedUnchanged;
+	bool		ii_IndexUnchanged;
+	bool		ii_Concurrent;
+	bool		ii_BrokenHotChain;
+	bool		ii_Summarizing;
+	int			ii_ParallelWorkers;
+	Oid			ii_Am;
+	void	   *ii_AmCache;
+	MemoryContext ii_Context;
+} IndexInfo;
+
+/* ----------------
+ *	  ExprContext_CB
+ *
+ *		List of callbacks to be called at ExprContext shutdown.
+ * ----------------
+ */
+typedef void (*ExprContextCallbackFunction) (Datum arg);
+
+typedef struct ExprContext_CB
+{
+	struct ExprContext_CB *next;
+	ExprContextCallbackFunction function;
+	Datum		arg;
+} ExprContext_CB;
+
+/* ----------------
+ *	  ExprContext
+ *
+ *		This class holds the "current context" information
+ *		needed to evaluate expressions for doing tuple qualifications
+ *		and tuple projections.  For example, if an expression refers
+ *		to an attribute in the current inner tuple then we need to know
+ *		what the current inner tuple is and so we look at the expression
+ *		context.
+ *
+ *	There are two memory contexts associated with an ExprContext:
+ *	* ecxt_per_query_memory is a query-lifespan context, typically the same
+ *	  context the ExprContext node itself is allocated in.  This context
+ *	  can be used for purposes such as storing function call cache info.
+ *	* ecxt_per_tuple_memory is a short-term context for expression results.
+ *	  As the name suggests, it will typically be reset once per tuple,
+ *	  before we begin to evaluate expressions for that tuple.  Each
+ *	  ExprContext normally has its very own per-tuple memory context.
+ *
+ *	CurrentMemoryContext should be set to ecxt_per_tuple_memory before
+ *	calling ExecEvalExpr() --- see ExecEvalExprSwitchContext().
+ * ----------------
+ */
+typedef struct ExprContext
+{
+	NodeTag		type;
+
+	/* Tuples that Var nodes in expression may refer to */
+#define FIELDNO_EXPRCONTEXT_SCANTUPLE 1
+	TupleTableSlot *ecxt_scantuple;
+#define FIELDNO_EXPRCONTEXT_INNERTUPLE 2
+	TupleTableSlot *ecxt_innertuple;
+#define FIELDNO_EXPRCONTEXT_OUTERTUPLE 3
+	TupleTableSlot *ecxt_outertuple;
+
+	/* Memory contexts for expression evaluation --- see notes above */
+	MemoryContext ecxt_per_query_memory;
+	MemoryContext ecxt_per_tuple_memory;
+
+	/* Values to substitute for Param nodes in expression */
+	ParamExecData *ecxt_param_exec_vals;	/* for PARAM_EXEC params */
+	ParamListInfo ecxt_param_list_info; /* for other param types */
+
+	/*
+	 * Values to substitute for Aggref nodes in the expressions of an Agg
+	 * node, or for WindowFunc nodes within a WindowAgg node.
+	 */
+#define FIELDNO_EXPRCONTEXT_AGGVALUES 8
+	Datum	   *ecxt_aggvalues; /* precomputed values for aggs/windowfuncs */
+#define FIELDNO_EXPRCONTEXT_AGGNULLS 9
+	bool	   *ecxt_aggnulls;	/* null flags for aggs/windowfuncs */
+
+	/* Value to substitute for CaseTestExpr nodes in expression */
+#define FIELDNO_EXPRCONTEXT_CASEDATUM 10
+	Datum		caseValue_datum;
+#define FIELDNO_EXPRCONTEXT_CASENULL 11
+	bool		caseValue_isNull;
+
+	/* Value to substitute for CoerceToDomainValue nodes in expression */
+#define FIELDNO_EXPRCONTEXT_DOMAINDATUM 12
+	Datum		domainValue_datum;
+#define FIELDNO_EXPRCONTEXT_DOMAINNULL 13
+	bool		domainValue_isNull;
+
+	/* Link to containing EState (NULL if a standalone ExprContext) */
+	struct EState *ecxt_estate;
+
+	/* Functions to call back when ExprContext is shut down or rescanned */
+	ExprContext_CB *ecxt_callbacks;
+} ExprContext;
+
+/*
+ * Set-result status used when evaluating functions potentially returning a
+ * set.
+ */
+typedef enum
+{
+	ExprSingleResult,			/* expression does not return a set */
+	ExprMultipleResult,			/* this result is an element of a set */
+	ExprEndResult				/* there are no more elements in the set */
+} ExprDoneCond;
+
+/*
+ * Return modes for functions returning sets.  Note values must be chosen
+ * as separate bits so that a bitmask can be formed to indicate supported
+ * modes.  SFRM_Materialize_Random and SFRM_Materialize_Preferred are
+ * auxiliary flags about SFRM_Materialize mode, rather than separate modes.
+ */
+typedef enum
+{
+	SFRM_ValuePerCall = 0x01,	/* one value returned per call */
+	SFRM_Materialize = 0x02,	/* result set instantiated in Tuplestore */
+	SFRM_Materialize_Random = 0x04, /* Tuplestore needs randomAccess */
+	SFRM_Materialize_Preferred = 0x08	/* caller prefers Tuplestore */
+} SetFunctionReturnMode;
+
+/*
+ * When calling a function that might return a set (multiple rows),
+ * a node of this type is passed as fcinfo->resultinfo to allow
+ * return status to be passed back.  A function returning set should
+ * raise an error if no such resultinfo is provided.
+ */
+typedef struct ReturnSetInfo
+{
+	NodeTag		type;
+	/* values set by caller: */
+	ExprContext *econtext;		/* context function is being called in */
+	TupleDesc	expectedDesc;	/* tuple descriptor expected by caller */
+	int			allowedModes;	/* bitmask: return modes caller can handle */
+	/* result status from function (but pre-initialized by caller): */
+	SetFunctionReturnMode returnMode;	/* actual return mode */
+	ExprDoneCond isDone;		/* status for ValuePerCall mode */
+	/* fields filled by function in Materialize return mode: */
+	Tuplestorestate *setResult; /* holds the complete returned tuple set */
+	TupleDesc	setDesc;		/* actual descriptor for returned tuples */
+} ReturnSetInfo;
+
+/* ----------------
+ *		ProjectionInfo node information
+ *
+ *		This is all the information needed to perform projections ---
+ *		that is, form new tuples by evaluation of targetlist expressions.
+ *		Nodes which need to do projections create one of these.
+ *
+ *		The target tuple slot is kept in ProjectionInfo->pi_state.resultslot.
+ *		ExecProject() evaluates the tlist, forms a tuple, and stores it
+ *		in the given slot.  Note that the result will be a "virtual" tuple
+ *		unless ExecMaterializeSlot() is then called to force it to be
+ *		converted to a physical tuple.  The slot must have a tupledesc
+ *		that matches the output of the tlist!
+ * ----------------
+ */
+typedef struct ProjectionInfo
+{
+	NodeTag		type;
+	/* instructions to evaluate projection */
+	ExprState	pi_state;
+	/* expression context in which to evaluate expression */
+	ExprContext *pi_exprContext;
+} ProjectionInfo;
+
+/* ----------------
+ *	  JunkFilter
+ *
+ *	  This class is used to store information regarding junk attributes.
+ *	  A junk attribute is an attribute in a tuple that is needed only for
+ *	  storing intermediate information in the executor, and does not belong
+ *	  in emitted tuples.  For example, when we do an UPDATE query,
+ *	  the planner adds a "junk" entry to the targetlist so that the tuples
+ *	  returned to ExecutePlan() contain an extra attribute: the ctid of
+ *	  the tuple to be updated.  This is needed to do the update, but we
+ *	  don't want the ctid to be part of the stored new tuple!  So, we
+ *	  apply a "junk filter" to remove the junk attributes and form the
+ *	  real output tuple.  The junkfilter code also provides routines to
+ *	  extract the values of the junk attribute(s) from the input tuple.
+ *
+ *	  targetList:		the original target list (including junk attributes).
+ *	  cleanTupType:		the tuple descriptor for the "clean" tuple (with
+ *						junk attributes removed).
+ *	  cleanMap:			A map with the correspondence between the non-junk
+ *						attribute numbers of the "original" tuple and the
+ *						attribute numbers of the "clean" tuple.
+ *	  resultSlot:		tuple slot used to hold cleaned tuple.
+ * ----------------
+ */
+typedef struct JunkFilter
+{
+	NodeTag		type;
+	List	   *jf_targetList;
+	TupleDesc	jf_cleanTupType;
+	AttrNumber *jf_cleanMap;
+	TupleTableSlot *jf_resultSlot;
+} JunkFilter;
+
+/*
+ * OnConflictSetState
+ *
+ * Executor state of an ON CONFLICT DO UPDATE operation.
+ */
+typedef struct OnConflictSetState
+{
+	NodeTag		type;
+
+	TupleTableSlot *oc_Existing;	/* slot to store existing target tuple in */
+	TupleTableSlot *oc_ProjSlot;	/* CONFLICT ... SET ... projection target */
+	ProjectionInfo *oc_ProjInfo;	/* for ON CONFLICT DO UPDATE SET */
+	ExprState  *oc_WhereClause; /* state for the WHERE clause */
+} OnConflictSetState;
+
+/* ----------------
+ *	 MergeActionState information
+ *
+ *	Executor state for a MERGE action.
+ * ----------------
+ */
+typedef struct MergeActionState
+{
+	NodeTag		type;
+
+	MergeAction *mas_action;	/* associated MergeAction node */
+	ProjectionInfo *mas_proj;	/* projection of the action's targetlist for
+								 * this rel */
+	ExprState  *mas_whenqual;	/* WHEN [NOT] MATCHED AND conditions */
+} MergeActionState;
+
+/*
+ * ResultRelInfo
+ *
+ * Whenever we update an existing relation, we have to update indexes on the
+ * relation, and perhaps also fire triggers.  ResultRelInfo holds all the
+ * information needed about a result relation, including indexes.
+ *
+ * Normally, a ResultRelInfo refers to a table that is in the query's range
+ * table; then ri_RangeTableIndex is the RT index and ri_RelationDesc is
+ * just a copy of the relevant es_relations[] entry.  However, in some
+ * situations we create ResultRelInfos for relations that are not in the
+ * range table, namely for targets of tuple routing in a partitioned table,
+ * and when firing triggers in tables other than the target tables (See
+ * ExecGetTriggerResultRel).  In these situations, ri_RangeTableIndex is 0
+ * and ri_RelationDesc is a separately-opened relcache pointer that needs to
+ * be separately closed.
+ */
+typedef struct ResultRelInfo
+{
+	NodeTag		type;
+
+	/* result relation's range table index, or 0 if not in range table */
+	Index		ri_RangeTableIndex;
+
+	/* relation descriptor for result relation */
+	Relation	ri_RelationDesc;
+
+	/* # of indices existing on result relation */
+	int			ri_NumIndices;
+
+	/* array of relation descriptors for indices */
+	RelationPtr ri_IndexRelationDescs;
+
+	/* array of key/attr info for indices */
+	IndexInfo **ri_IndexRelationInfo;
+
+	/*
+	 * For UPDATE/DELETE result relations, the attribute number of the row
+	 * identity junk attribute in the source plan's output tuples
+	 */
+	AttrNumber	ri_RowIdAttNo;
+
+	/* For UPDATE, attnums of generated columns to be computed */
+	Bitmapset  *ri_extraUpdatedCols;
+
+	/* Projection to generate new tuple in an INSERT/UPDATE */
+	ProjectionInfo *ri_projectNew;
+	/* Slot to hold that tuple */
+	TupleTableSlot *ri_newTupleSlot;
+	/* Slot to hold the old tuple being updated */
+	TupleTableSlot *ri_oldTupleSlot;
+	/* Have the projection and the slots above been initialized? */
+	bool		ri_projectNewInfoValid;
+
+	/* triggers to be fired, if any */
+	TriggerDesc *ri_TrigDesc;
+
+	/* cached lookup info for trigger functions */
+	FmgrInfo   *ri_TrigFunctions;
+
+	/* array of trigger WHEN expr states */
+	ExprState **ri_TrigWhenExprs;
+
+	/* optional runtime measurements for triggers */
+	Instrumentation *ri_TrigInstrument;
+
+	/* On-demand created slots for triggers / returning processing */
+	TupleTableSlot *ri_ReturningSlot;	/* for trigger output tuples */
+	TupleTableSlot *ri_TrigOldSlot; /* for a trigger's old tuple */
+	TupleTableSlot *ri_TrigNewSlot; /* for a trigger's new tuple */
+
+	/* FDW callback functions, if foreign table */
+	struct FdwRoutine *ri_FdwRoutine;
+
+	/* available to save private state of FDW */
+	void	   *ri_FdwState;
+
+	/* true when modifying foreign table directly */
+	bool		ri_usesFdwDirectModify;
+
+	/* batch insert stuff */
+	int			ri_NumSlots;	/* number of slots in the array */
+	int			ri_NumSlotsInitialized; /* number of initialized slots */
+	int			ri_BatchSize;	/* max slots inserted in a single batch */
+	TupleTableSlot **ri_Slots;	/* input tuples for batch insert */
+	TupleTableSlot **ri_PlanSlots;
+
+	/* list of WithCheckOption's to be checked */
+	List	   *ri_WithCheckOptions;
+
+	/* list of WithCheckOption expr states */
+	List	   *ri_WithCheckOptionExprs;
+
+	/* array of constraint-checking expr states */
+	ExprState **ri_ConstraintExprs;
+
+	/* arrays of stored generated columns expr states, for INSERT and UPDATE */
+	ExprState **ri_GeneratedExprsI;
+	ExprState **ri_GeneratedExprsU;
+
+	/* number of stored generated columns we need to compute */
+	int			ri_NumGeneratedNeededI;
+	int			ri_NumGeneratedNeededU;
+
+	/* list of RETURNING expressions */
+	List	   *ri_returningList;
+
+	/* for computing a RETURNING list */
+	ProjectionInfo *ri_projectReturning;
+
+	/* list of arbiter indexes to use to check conflicts */
+	List	   *ri_onConflictArbiterIndexes;
+
+	/* ON CONFLICT evaluation state */
+	OnConflictSetState *ri_onConflict;
+
+	/* for MERGE, lists of MergeActionState */
+	List	   *ri_matchedMergeAction;
+	List	   *ri_notMatchedMergeAction;
+
+	/* partition check expression state (NULL if not set up yet) */
+	ExprState  *ri_PartitionCheckExpr;
+
+	/*
+	 * Map to convert child result relation tuples to the format of the table
+	 * actually mentioned in the query (called "root").  Computed only if
+	 * needed.  A NULL map value indicates that no conversion is needed, so we
+	 * must have a separate flag to show if the map has been computed.
+	 */
+	TupleConversionMap *ri_ChildToRootMap;
+	bool		ri_ChildToRootMapValid;
+
+	/*
+	 * As above, but in the other direction.
+	 */
+	TupleConversionMap *ri_RootToChildMap;
+	bool		ri_RootToChildMapValid;
+
+	/*
+	 * Information needed by tuple routing target relations
+	 *
+	 * RootResultRelInfo gives the target relation mentioned in the query, if
+	 * it's a partitioned table. It is not set if the target relation
+	 * mentioned in the query is an inherited table, nor when tuple routing is
+	 * not needed.
+	 *
+	 * PartitionTupleSlot is non-NULL if RootToChild conversion is needed and
+	 * the relation is a partition.
+	 */
+	struct ResultRelInfo *ri_RootResultRelInfo;
+	TupleTableSlot *ri_PartitionTupleSlot;
+
+	/* for use by copyfrom.c when performing multi-inserts */
+	struct CopyMultiInsertBuffer *ri_CopyMultiInsertBuffer;
+
+	/*
+	 * Used when a leaf partition is involved in a cross-partition update of
+	 * one of its ancestors; see ExecCrossPartitionUpdateForeignKey().
+	 */
+	List	   *ri_ancestorResultRels;
+} ResultRelInfo;
+
+/* ----------------
+ *	  AsyncRequest
+ *
+ * State for an asynchronous tuple request.
+ * ----------------
+ */
+typedef struct AsyncRequest
+{
+	struct PlanState *requestor;	/* Node that wants a tuple */
+	struct PlanState *requestee;	/* Node from which a tuple is wanted */
+	int			request_index;	/* Scratch space for requestor */
+	bool		callback_pending;	/* Callback is needed */
+	bool		request_complete;	/* Request complete, result valid */
+	TupleTableSlot *result;		/* Result (NULL or an empty slot if no more
+								 * tuples) */
+} AsyncRequest;
+
+/* ----------------
+ *	  EState information
+ *
+ * Working state for an Executor invocation
+ * ----------------
+ */
+typedef struct EState
+{
+	NodeTag		type;
+
+	/* Basic state for all query types: */
+	ScanDirection es_direction; /* current scan direction */
+	Snapshot	es_snapshot;	/* time qual to use */
+	Snapshot	es_crosscheck_snapshot; /* crosscheck time qual for RI */
+	List	   *es_range_table; /* List of RangeTblEntry */
+	Index		es_range_table_size;	/* size of the range table arrays */
+	Relation   *es_relations;	/* Array of per-range-table-entry Relation
+								 * pointers, or NULL if not yet opened */
+	struct ExecRowMark **es_rowmarks;	/* Array of per-range-table-entry
+										 * ExecRowMarks, or NULL if none */
+	List	   *es_rteperminfos;	/* List of RTEPermissionInfo */
+	PlannedStmt *es_plannedstmt;	/* link to top of plan tree */
+	const char *es_sourceText;	/* Source text from QueryDesc */
+
+	JunkFilter *es_junkFilter;	/* top-level junk filter, if any */
+
+	/* If query can insert/delete tuples, the command ID to mark them with */
+	CommandId	es_output_cid;
+
+	/* Info about target table(s) for insert/update/delete queries: */
+	ResultRelInfo **es_result_relations;	/* Array of per-range-table-entry
+											 * ResultRelInfo pointers, or NULL
+											 * if not a target table */
+	List	   *es_opened_result_relations; /* List of non-NULL entries in
+											 * es_result_relations in no
+											 * specific order */
+
+	PartitionDirectory es_partition_directory;	/* for PartitionDesc lookup */
+
+	/*
+	 * The following list contains ResultRelInfos created by the tuple routing
+	 * code for partitions that aren't found in the es_result_relations array.
+	 */
+	List	   *es_tuple_routing_result_relations;
+
+	/* Stuff used for firing triggers: */
+	List	   *es_trig_target_relations;	/* trigger-only ResultRelInfos */
+
+	/* Parameter info: */
+	ParamListInfo es_param_list_info;	/* values of external params */
+	ParamExecData *es_param_exec_vals;	/* values of internal params */
+
+	QueryEnvironment *es_queryEnv;	/* query environment */
+
+	/* Other working state: */
+	MemoryContext es_query_cxt; /* per-query context in which EState lives */
+
+	List	   *es_tupleTable;	/* List of TupleTableSlots */
+
+	uint64		es_processed;	/* # of tuples processed during one
+								 * ExecutorRun() call. */
+	uint64		es_total_processed; /* total # of tuples aggregated across all
+									 * ExecutorRun() calls. */
+
+	int			es_top_eflags;	/* eflags passed to ExecutorStart */
+	int			es_instrument;	/* OR of InstrumentOption flags */
+	bool		es_finished;	/* true when ExecutorFinish is done */
+
+	List	   *es_exprcontexts;	/* List of ExprContexts within EState */
+
+	List	   *es_subplanstates;	/* List of PlanState for SubPlans */
+
+	List	   *es_auxmodifytables; /* List of secondary ModifyTableStates */
+
+	/*
+	 * this ExprContext is for per-output-tuple operations, such as constraint
+	 * checks and index-value computations.  It will be reset for each output
+	 * tuple.  Note that it will be created only if needed.
+	 */
+	ExprContext *es_per_tuple_exprcontext;
+
+	/*
+	 * If not NULL, this is an EPQState's EState. This is a field in EState
+	 * both to allow EvalPlanQual aware executor nodes to detect that they
+	 * need to perform EPQ related work, and to provide necessary information
+	 * to do so.
+	 */
+	struct EPQState *es_epq_active;
+
+	bool		es_use_parallel_mode;	/* can we use parallel workers? */
+
+	/* The per-query shared memory area to use for parallel execution. */
+	struct dsa_area *es_query_dsa;
+
+	/*
+	 * JIT information. es_jit_flags indicates whether JIT should be performed
+	 * and with which options.  es_jit is created on-demand when JITing is
+	 * performed.
+	 *
+	 * es_jit_worker_instr is the combined, on demand allocated,
+	 * instrumentation from all workers. The leader's instrumentation is kept
+	 * separate, and is combined on demand by ExplainPrintJITSummary().
+	 */
+	int			es_jit_flags;
+	struct JitContext *es_jit;
+	struct JitInstrumentation *es_jit_worker_instr;
+
+	/*
+	 * Lists of ResultRelInfos for foreign tables on which batch-inserts are
+	 * to be executed and owning ModifyTableStates, stored in the same order.
+	 */
+	List	   *es_insert_pending_result_relations;
+	List	   *es_insert_pending_modifytables;
+} EState;
+
+
+/*
+ * ExecRowMark -
+ *	   runtime representation of FOR [KEY] UPDATE/SHARE clauses
+ *
+ * When doing UPDATE/DELETE/MERGE/SELECT FOR [KEY] UPDATE/SHARE, we will have
+ * an ExecRowMark for each non-target relation in the query (except inheritance
+ * parent RTEs, which can be ignored at runtime).  Virtual relations such as
+ * subqueries-in-FROM will have an ExecRowMark with relation == NULL.  See
+ * PlanRowMark for details about most of the fields.  In addition to fields
+ * directly derived from PlanRowMark, we store an activity flag (to denote
+ * inactive children of inheritance trees), curCtid, which is used by the
+ * WHERE CURRENT OF code, and ermExtra, which is available for use by the plan
+ * node that sources the relation (e.g., for a foreign table the FDW can use
+ * ermExtra to hold information).
+ *
+ * EState->es_rowmarks is an array of these structs, indexed by RT index,
+ * with NULLs for irrelevant RT indexes.  es_rowmarks itself is NULL if
+ * there are no rowmarks.
+ */
+typedef struct ExecRowMark
+{
+	Relation	relation;		/* opened and suitably locked relation */
+	Oid			relid;			/* its OID (or InvalidOid, if subquery) */
+	Index		rti;			/* its range table index */
+	Index		prti;			/* parent range table index, if child */
+	Index		rowmarkId;		/* unique identifier for resjunk columns */
+	RowMarkType markType;		/* see enum in nodes/plannodes.h */
+	LockClauseStrength strength;	/* LockingClause's strength, or LCS_NONE */
+	LockWaitPolicy waitPolicy;	/* NOWAIT and SKIP LOCKED */
+	bool		ermActive;		/* is this mark relevant for current tuple? */
+	ItemPointerData curCtid;	/* ctid of currently locked tuple, if any */
+	void	   *ermExtra;		/* available for use by relation source node */
+} ExecRowMark;
+
+/*
+ * ExecAuxRowMark -
+ *	   additional runtime representation of FOR [KEY] UPDATE/SHARE clauses
+ *
+ * Each LockRows and ModifyTable node keeps a list of the rowmarks it needs to
+ * deal with.  In addition to a pointer to the related entry in es_rowmarks,
+ * this struct carries the column number(s) of the resjunk columns associated
+ * with the rowmark (see comments for PlanRowMark for more detail).
+ */
+typedef struct ExecAuxRowMark
+{
+	ExecRowMark *rowmark;		/* related entry in es_rowmarks */
+	AttrNumber	ctidAttNo;		/* resno of ctid junk attribute, if any */
+	AttrNumber	toidAttNo;		/* resno of tableoid junk attribute, if any */
+	AttrNumber	wholeAttNo;		/* resno of whole-row junk attribute, if any */
+} ExecAuxRowMark;
+
+
+/* ----------------------------------------------------------------
+ *				 Tuple Hash Tables
+ *
+ * All-in-memory tuple hash tables are used for a number of purposes.
+ *
+ * Note: tab_hash_funcs are for the key datatype(s) stored in the table,
+ * and tab_eq_funcs are non-cross-type equality operators for those types.
+ * Normally these are the only functions used, but FindTupleHashEntry()
+ * supports searching a hashtable using cross-data-type hashing.  For that,
+ * the caller must supply hash functions for the LHS datatype as well as
+ * the cross-type equality operators to use.  in_hash_funcs and cur_eq_func
+ * are set to point to the caller's function arrays while doing such a search.
+ * During LookupTupleHashEntry(), they point to tab_hash_funcs and
+ * tab_eq_func respectively.
+ * ----------------------------------------------------------------
+ */
+typedef struct TupleHashEntryData *TupleHashEntry;
+typedef struct TupleHashTableData *TupleHashTable;
+
+typedef struct TupleHashEntryData
+{
+	MinimalTuple firstTuple;	/* copy of first tuple in this group */
+	void	   *additional;		/* user data */
+	uint32		status;			/* hash status */
+	uint32		hash;			/* hash value (cached) */
+} TupleHashEntryData;
+
+/* define parameters necessary to generate the tuple hash table interface */
+#define SH_PREFIX tuplehash
+#define SH_ELEMENT_TYPE TupleHashEntryData
+#define SH_KEY_TYPE MinimalTuple
+#define SH_SCOPE extern
+#define SH_DECLARE
+#include "lib/simplehash.h"
+
+typedef struct TupleHashTableData
+{
+	tuplehash_hash *hashtab;	/* underlying hash table */
+	int			numCols;		/* number of columns in lookup key */
+	AttrNumber *keyColIdx;		/* attr numbers of key columns */
+	FmgrInfo   *tab_hash_funcs; /* hash functions for table datatype(s) */
+	ExprState  *tab_eq_func;	/* comparator for table datatype(s) */
+	Oid		   *tab_collations; /* collations for hash and comparison */
+	MemoryContext tablecxt;		/* memory context containing table */
+	MemoryContext tempcxt;		/* context for function evaluations */
+	Size		entrysize;		/* actual size to make each hash entry */
+	TupleTableSlot *tableslot;	/* slot for referencing table entries */
+	/* The following fields are set transiently for each table search: */
+	TupleTableSlot *inputslot;	/* current input tuple's slot */
+	FmgrInfo   *in_hash_funcs;	/* hash functions for input datatype(s) */
+	ExprState  *cur_eq_func;	/* comparator for input vs. table */
+	uint32		hash_iv;		/* hash-function IV */
+	ExprContext *exprcontext;	/* expression context */
+}			TupleHashTableData;
+
+typedef tuplehash_iterator TupleHashIterator;
+
+/*
+ * Use InitTupleHashIterator/TermTupleHashIterator for a read/write scan.
+ * Use ResetTupleHashIterator if the table can be frozen (in this case no
+ * explicit scan termination is needed).
+ */
+#define InitTupleHashIterator(htable, iter) \
+	tuplehash_start_iterate(htable->hashtab, iter)
+#define TermTupleHashIterator(iter) \
+	((void) 0)
+#define ResetTupleHashIterator(htable, iter) \
+	InitTupleHashIterator(htable, iter)
+#define ScanTupleHashTable(htable, iter) \
+	tuplehash_iterate(htable->hashtab, iter)
+
+
+/* ----------------------------------------------------------------
+ *				 Expression State Nodes
+ *
+ * Formerly, there was a separate executor expression state node corresponding
+ * to each node in a planned expression tree.  That's no longer the case; for
+ * common expression node types, all the execution info is embedded into
+ * step(s) in a single ExprState node.  But we still have a few executor state
+ * node types for selected expression node types, mostly those in which info
+ * has to be shared with other parts of the execution state tree.
+ * ----------------------------------------------------------------
+ */
+
+/* ----------------
+ *		WindowFuncExprState node
+ * ----------------
+ */
+typedef struct WindowFuncExprState
+{
+	NodeTag		type;
+	WindowFunc *wfunc;			/* expression plan node */
+	List	   *args;			/* ExprStates for argument expressions */
+	ExprState  *aggfilter;		/* FILTER expression */
+	int			wfuncno;		/* ID number for wfunc within its plan node */
+} WindowFuncExprState;
+
+
+/* ----------------
+ *		SetExprState node
+ *
+ * State for evaluating a potentially set-returning expression (like FuncExpr
+ * or OpExpr).  In some cases, like some of the expressions in ROWS FROM(...)
+ * the expression might not be a SRF, but nonetheless it uses the same
+ * machinery as SRFs; it will be treated as a SRF returning a single row.
+ * ----------------
+ */
+typedef struct SetExprState
+{
+	NodeTag		type;
+	Expr	   *expr;			/* expression plan node */
+	List	   *args;			/* ExprStates for argument expressions */
+
+	/*
+	 * In ROWS FROM, functions can be inlined, removing the FuncExpr normally
+	 * inside.  In such a case this is the compiled expression (which cannot
+	 * return a set), which'll be evaluated using regular ExecEvalExpr().
+	 */
+	ExprState  *elidedFuncState;
+
+	/*
+	 * Function manager's lookup info for the target function.  If func.fn_oid
+	 * is InvalidOid, we haven't initialized it yet (nor any of the following
+	 * fields, except funcReturnsSet).
+	 */
+	FmgrInfo	func;
+
+	/*
+	 * For a set-returning function (SRF) that returns a tuplestore, we keep
+	 * the tuplestore here and dole out the result rows one at a time. The
+	 * slot holds the row currently being returned.
+	 */
+	Tuplestorestate *funcResultStore;
+	TupleTableSlot *funcResultSlot;
+
+	/*
+	 * In some cases we need to compute a tuple descriptor for the function's
+	 * output.  If so, it's stored here.
+	 */
+	TupleDesc	funcResultDesc;
+	bool		funcReturnsTuple;	/* valid when funcResultDesc isn't NULL */
+
+	/*
+	 * Remember whether the function is declared to return a set.  This is set
+	 * by ExecInitExpr, and is valid even before the FmgrInfo is set up.
+	 */
+	bool		funcReturnsSet;
+
+	/*
+	 * setArgsValid is true when we are evaluating a set-returning function
+	 * that uses value-per-call mode and we are in the middle of a call
+	 * series; we want to pass the same argument values to the function again
+	 * (and again, until it returns ExprEndResult).  This indicates that
+	 * fcinfo_data already contains valid argument data.
+	 */
+	bool		setArgsValid;
+
+	/*
+	 * Flag to remember whether we have registered a shutdown callback for
+	 * this SetExprState.  We do so only if funcResultStore or setArgsValid
+	 * has been set at least once (since all the callback is for is to release
+	 * the tuplestore or clear setArgsValid).
+	 */
+	bool		shutdown_reg;	/* a shutdown callback is registered */
+
+	/*
+	 * Call parameter structure for the function.  This has been initialized
+	 * (by InitFunctionCallInfoData) if func.fn_oid is valid.  It also saves
+	 * argument values between calls, when setArgsValid is true.
+	 */
+	FunctionCallInfo fcinfo;
+} SetExprState;
+
+/* ----------------
+ *		SubPlanState node
+ * ----------------
+ */
+typedef struct SubPlanState
+{
+	NodeTag		type;
+	SubPlan    *subplan;		/* expression plan node */
+	struct PlanState *planstate;	/* subselect plan's state tree */
+	struct PlanState *parent;	/* parent plan node's state tree */
+	ExprState  *testexpr;		/* state of combining expression */
+	List	   *args;			/* states of argument expression(s) */
+	HeapTuple	curTuple;		/* copy of most recent tuple from subplan */
+	Datum		curArray;		/* most recent array from ARRAY() subplan */
+	/* these are used when hashing the subselect's output: */
+	TupleDesc	descRight;		/* subselect desc after projection */
+	ProjectionInfo *projLeft;	/* for projecting lefthand exprs */
+	ProjectionInfo *projRight;	/* for projecting subselect output */
+	TupleHashTable hashtable;	/* hash table for no-nulls subselect rows */
+	TupleHashTable hashnulls;	/* hash table for rows with null(s) */
+	bool		havehashrows;	/* true if hashtable is not empty */
+	bool		havenullrows;	/* true if hashnulls is not empty */
+	MemoryContext hashtablecxt; /* memory context containing hash tables */
+	MemoryContext hashtempcxt;	/* temp memory context for hash tables */
+	ExprContext *innerecontext; /* econtext for computing inner tuples */
+	int			numCols;		/* number of columns being hashed */
+	/* each of the remaining fields is an array of length numCols: */
+	AttrNumber *keyColIdx;		/* control data for hash tables */
+	Oid		   *tab_eq_funcoids;	/* equality func oids for table
+									 * datatype(s) */
+	Oid		   *tab_collations; /* collations for hash and comparison */
+	FmgrInfo   *tab_hash_funcs; /* hash functions for table datatype(s) */
+	FmgrInfo   *tab_eq_funcs;	/* equality functions for table datatype(s) */
+	FmgrInfo   *lhs_hash_funcs; /* hash functions for lefthand datatype(s) */
+	FmgrInfo   *cur_eq_funcs;	/* equality functions for LHS vs. table */
+	ExprState  *cur_eq_comp;	/* equality comparator for LHS vs. table */
+} SubPlanState;
+
+/*
+ * DomainConstraintState - one item to check during CoerceToDomain
+ *
+ * Note: we consider this to be part of an ExprState tree, so we give it
+ * a name following the xxxState convention.  But there's no directly
+ * associated plan-tree node.
+ */
+typedef enum DomainConstraintType
+{
+	DOM_CONSTRAINT_NOTNULL,
+	DOM_CONSTRAINT_CHECK
+} DomainConstraintType;
+
+typedef struct DomainConstraintState
+{
+	NodeTag		type;
+	DomainConstraintType constrainttype;	/* constraint type */
+	char	   *name;			/* name of constraint (for error msgs) */
+	Expr	   *check_expr;		/* for CHECK, a boolean expression */
+	ExprState  *check_exprstate;	/* check_expr's eval state, or NULL */
+} DomainConstraintState;
+
+
+/* ----------------------------------------------------------------
+ *				 Executor State Trees
+ *
+ * An executing query has a PlanState tree paralleling the Plan tree
+ * that describes the plan.
+ * ----------------------------------------------------------------
+ */
+
+/* ----------------
+ *	 ExecProcNodeMtd
+ *
+ * This is the method called by ExecProcNode to return the next tuple
+ * from an executor node.  It returns NULL, or an empty TupleTableSlot,
+ * if no more tuples are available.
+ * ----------------
+ */
+typedef TupleTableSlot *(*ExecProcNodeMtd) (struct PlanState *pstate);
+
+/* ----------------
+ *		PlanState node
+ *
+ * We never actually instantiate any PlanState nodes; this is just the common
+ * abstract superclass for all PlanState-type nodes.
+ * ----------------
+ */
+typedef struct PlanState
+{
+	pg_node_attr(abstract)
+
+	NodeTag		type;
+
+	Plan	   *plan;			/* associated Plan node */
+
+	EState	   *state;			/* at execution time, states of individual
+								 * nodes point to one EState for the whole
+								 * top-level plan */
+
+	ExecProcNodeMtd ExecProcNode;	/* function to return next tuple */
+	ExecProcNodeMtd ExecProcNodeReal;	/* actual function, if above is a
+										 * wrapper */
+
+	Instrumentation *instrument;	/* Optional runtime stats for this node */
+	WorkerInstrumentation *worker_instrument;	/* per-worker instrumentation */
+
+	/* Per-worker JIT instrumentation */
+	struct SharedJitInstrumentation *worker_jit_instrument;
+
+	/*
+	 * Common structural data for all Plan types.  These links to subsidiary
+	 * state trees parallel links in the associated plan tree (except for the
+	 * subPlan list, which does not exist in the plan tree).
+	 */
+	ExprState  *qual;			/* boolean qual condition */
+	struct PlanState *lefttree; /* input plan tree(s) */
+	struct PlanState *righttree;
+
+	List	   *initPlan;		/* Init SubPlanState nodes (un-correlated expr
+								 * subselects) */
+	List	   *subPlan;		/* SubPlanState nodes in my expressions */
+
+	/*
+	 * State for management of parameter-change-driven rescanning
+	 */
+	Bitmapset  *chgParam;		/* set of IDs of changed Params */
+
+	/*
+	 * Other run-time state needed by most if not all node types.
+	 */
+	TupleDesc	ps_ResultTupleDesc; /* node's return type */
+	TupleTableSlot *ps_ResultTupleSlot; /* slot for my result tuples */
+	ExprContext *ps_ExprContext;	/* node's expression-evaluation context */
+	ProjectionInfo *ps_ProjInfo;	/* info for doing tuple projection */
+
+	bool		async_capable;	/* true if node is async-capable */
+
+	/*
+	 * Scanslot's descriptor if known. This is a bit of a hack, but otherwise
+	 * it's hard for expression compilation to optimize based on the
+	 * descriptor, without encoding knowledge about all executor nodes.
+	 */
+	TupleDesc	scandesc;
+
+	/*
+	 * Define the slot types for inner, outer and scanslots for expression
+	 * contexts with this state as a parent.  If *opsset is set, then
+	 * *opsfixed indicates whether *ops is guaranteed to be the type of slot
+	 * used. That means that every slot in the corresponding
+	 * ExprContext.ecxt_*tuple will point to a slot of that type, while
+	 * evaluating the expression.  If *opsfixed is false, but *ops is set,
+	 * that indicates the most likely type of slot.
+	 *
+	 * The scan* fields are set by ExecInitScanTupleSlot(). If that's not
+	 * called, nodes can initialize the fields themselves.
+	 *
+	 * If outer/inneropsset is false, the information is inferred on-demand
+	 * using ExecGetResultSlotOps() on ->righttree/lefttree, using the
+	 * corresponding node's resultops* fields.
+	 *
+	 * The result* fields are automatically set when ExecInitResultSlot is
+	 * used (be it directly or when the slot is created by
+	 * ExecAssignScanProjectionInfo() /
+	 * ExecConditionalAssignProjectionInfo()).  If no projection is necessary
+	 * ExecConditionalAssignProjectionInfo() defaults those fields to the scan
+	 * operations.
+	 */
+	const TupleTableSlotOps *scanops;
+	const TupleTableSlotOps *outerops;
+	const TupleTableSlotOps *innerops;
+	const TupleTableSlotOps *resultops;
+	bool		scanopsfixed;
+	bool		outeropsfixed;
+	bool		inneropsfixed;
+	bool		resultopsfixed;
+	bool		scanopsset;
+	bool		outeropsset;
+	bool		inneropsset;
+	bool		resultopsset;
+} PlanState;
+
+/* ----------------
+ *	these are defined to avoid confusion problems with "left"
+ *	and "right" and "inner" and "outer".  The convention is that
+ *	the "left" plan is the "outer" plan and the "right" plan is
+ *	the inner plan, but these make the code more readable.
+ * ----------------
+ */
+#define innerPlanState(node)		(((PlanState *)(node))->righttree)
+#define outerPlanState(node)		(((PlanState *)(node))->lefttree)
+
+/* Macros for inline access to certain instrumentation counters */
+#define InstrCountTuples2(node, delta) \
+	do { \
+		if (((PlanState *)(node))->instrument) \
+			((PlanState *)(node))->instrument->ntuples2 += (delta); \
+	} while (0)
+#define InstrCountFiltered1(node, delta) \
+	do { \
+		if (((PlanState *)(node))->instrument) \
+			((PlanState *)(node))->instrument->nfiltered1 += (delta); \
+	} while(0)
+#define InstrCountFiltered2(node, delta) \
+	do { \
+		if (((PlanState *)(node))->instrument) \
+			((PlanState *)(node))->instrument->nfiltered2 += (delta); \
+	} while(0)
+
+/*
+ * EPQState is state for executing an EvalPlanQual recheck on a candidate
+ * tuples e.g. in ModifyTable or LockRows.
+ *
+ * To execute EPQ a separate EState is created (stored in ->recheckestate),
+ * which shares some resources, like the rangetable, with the main query's
+ * EState (stored in ->parentestate). The (sub-)tree of the plan that needs to
+ * be rechecked (in ->plan), is separately initialized (into
+ * ->recheckplanstate), but shares plan nodes with the corresponding nodes in
+ * the main query. The scan nodes in that separate executor tree are changed
+ * to return only the current tuple of interest for the respective
+ * table. Those tuples are either provided by the caller (using
+ * EvalPlanQualSlot), and/or found using the rowmark mechanism (non-locking
+ * rowmarks by the EPQ machinery itself, locking ones by the caller).
+ *
+ * While the plan to be checked may be changed using EvalPlanQualSetPlan(),
+ * all such plans need to share the same EState.
+ */
+typedef struct EPQState
+{
+	/* These are initialized by EvalPlanQualInit() and do not change later: */
+	EState	   *parentestate;	/* main query's EState */
+	int			epqParam;		/* ID of Param to force scan node re-eval */
+	List	   *resultRelations;	/* integer list of RT indexes, or NIL */
+
+	/*
+	 * relsubs_slot[scanrelid - 1] holds the EPQ test tuple to be returned by
+	 * the scan node for the scanrelid'th RT index, in place of performing an
+	 * actual table scan.  Callers should use EvalPlanQualSlot() to fetch
+	 * these slots.
+	 */
+	List	   *tuple_table;	/* tuple table for relsubs_slot */
+	TupleTableSlot **relsubs_slot;
+
+	/*
+	 * Initialized by EvalPlanQualInit(), may be changed later with
+	 * EvalPlanQualSetPlan():
+	 */
+
+	Plan	   *plan;			/* plan tree to be executed */
+	List	   *arowMarks;		/* ExecAuxRowMarks (non-locking only) */
+
+
+	/*
+	 * The original output tuple to be rechecked.  Set by
+	 * EvalPlanQualSetSlot(), before EvalPlanQualNext() or EvalPlanQual() may
+	 * be called.
+	 */
+	TupleTableSlot *origslot;
+
+
+	/* Initialized or reset by EvalPlanQualBegin(): */
+
+	EState	   *recheckestate;	/* EState for EPQ execution, see above */
+
+	/*
+	 * Rowmarks that can be fetched on-demand using
+	 * EvalPlanQualFetchRowMark(), indexed by scanrelid - 1. Only non-locking
+	 * rowmarks.
+	 */
+	ExecAuxRowMark **relsubs_rowmark;
+
+	/*
+	 * relsubs_done[scanrelid - 1] is true if there is no EPQ tuple for this
+	 * target relation or it has already been fetched in the current scan of
+	 * this target relation within the current EvalPlanQual test.
+	 */
+	bool	   *relsubs_done;
+
+	/*
+	 * relsubs_blocked[scanrelid - 1] is true if there is no EPQ tuple for
+	 * this target relation during the current EvalPlanQual test.  We keep
+	 * these flags set for all relids listed in resultRelations, but
+	 * transiently clear the one for the relation whose tuple is actually
+	 * passed to EvalPlanQual().
+	 */
+	bool	   *relsubs_blocked;
+
+	PlanState  *recheckplanstate;	/* EPQ specific exec nodes, for ->plan */
+} EPQState;
+
+
+/* ----------------
+ *	 ResultState information
+ * ----------------
+ */
+typedef struct ResultState
+{
+	PlanState	ps;				/* its first field is NodeTag */
+	ExprState  *resconstantqual;
+	bool		rs_done;		/* are we done? */
+	bool		rs_checkqual;	/* do we need to check the qual? */
+} ResultState;
+
+/* ----------------
+ *	 ProjectSetState information
+ *
+ * Note: at least one of the "elems" will be a SetExprState; the rest are
+ * regular ExprStates.
+ * ----------------
+ */
+typedef struct ProjectSetState
+{
+	PlanState	ps;				/* its first field is NodeTag */
+	Node	  **elems;			/* array of expression states */
+	ExprDoneCond *elemdone;		/* array of per-SRF is-done states */
+	int			nelems;			/* length of elemdone[] array */
+	bool		pending_srf_tuples; /* still evaluating srfs in tlist? */
+	MemoryContext argcontext;	/* context for SRF arguments */
+} ProjectSetState;
+
+
+/* flags for mt_merge_subcommands */
+#define MERGE_INSERT	0x01
+#define MERGE_UPDATE	0x02
+#define MERGE_DELETE	0x04
+
+/* ----------------
+ *	 ModifyTableState information
+ * ----------------
+ */
+typedef struct ModifyTableState
+{
+	PlanState	ps;				/* its first field is NodeTag */
+	CmdType		operation;		/* INSERT, UPDATE, DELETE, or MERGE */
+	bool		canSetTag;		/* do we set the command tag/es_processed? */
+	bool		mt_done;		/* are we done? */
+	int			mt_nrels;		/* number of entries in resultRelInfo[] */
+	ResultRelInfo *resultRelInfo;	/* info about target relation(s) */
+
+	/*
+	 * Target relation mentioned in the original statement, used to fire
+	 * statement-level triggers and as the root for tuple routing.  (This
+	 * might point to one of the resultRelInfo[] entries, but it can also be a
+	 * distinct struct.)
+	 */
+	ResultRelInfo *rootResultRelInfo;
+
+	EPQState	mt_epqstate;	/* for evaluating EvalPlanQual rechecks */
+	bool		fireBSTriggers; /* do we need to fire stmt triggers? */
+
+	/*
+	 * These fields are used for inherited UPDATE and DELETE, to track which
+	 * target relation a given tuple is from.  If there are a lot of target
+	 * relations, we use a hash table to translate table OIDs to
+	 * resultRelInfo[] indexes; otherwise mt_resultOidHash is NULL.
+	 */
+	int			mt_resultOidAttno;	/* resno of "tableoid" junk attr */
+	Oid			mt_lastResultOid;	/* last-seen value of tableoid */
+	int			mt_lastResultIndex; /* corresponding index in resultRelInfo[] */
+	HTAB	   *mt_resultOidHash;	/* optional hash table to speed lookups */
+
+	/*
+	 * Slot for storing tuples in the root partitioned table's rowtype during
+	 * an UPDATE of a partitioned table.
+	 */
+	TupleTableSlot *mt_root_tuple_slot;
+
+	/* Tuple-routing support info */
+	struct PartitionTupleRouting *mt_partition_tuple_routing;
+
+	/* controls transition table population for specified operation */
+	struct TransitionCaptureState *mt_transition_capture;
+
+	/* controls transition table population for INSERT...ON CONFLICT UPDATE */
+	struct TransitionCaptureState *mt_oc_transition_capture;
+
+	/* Flags showing which subcommands are present INS/UPD/DEL/DO NOTHING */
+	int			mt_merge_subcommands;
+
+	/* tuple counters for MERGE */
+	double		mt_merge_inserted;
+	double		mt_merge_updated;
+	double		mt_merge_deleted;
+} ModifyTableState;
+
+/* ----------------
+ *	 AppendState information
+ *
+ *		nplans				how many plans are in the array
+ *		whichplan			which synchronous plan is being executed (0 .. n-1)
+ *							or a special negative value. See nodeAppend.c.
+ *		prune_state			details required to allow partitions to be
+ *							eliminated from the scan, or NULL if not possible.
+ *		valid_subplans		for runtime pruning, valid synchronous appendplans
+ *							indexes to scan.
+ * ----------------
+ */
+
+struct AppendState;
+typedef struct AppendState AppendState;
+struct ParallelAppendState;
+typedef struct ParallelAppendState ParallelAppendState;
+struct PartitionPruneState;
+
+struct AppendState
+{
+	PlanState	ps;				/* its first field is NodeTag */
+	PlanState **appendplans;	/* array of PlanStates for my inputs */
+	int			as_nplans;
+	int			as_whichplan;
+	bool		as_begun;		/* false means need to initialize */
+	Bitmapset  *as_asyncplans;	/* asynchronous plans indexes */
+	int			as_nasyncplans; /* # of asynchronous plans */
+	AsyncRequest **as_asyncrequests;	/* array of AsyncRequests */
+	TupleTableSlot **as_asyncresults;	/* unreturned results of async plans */
+	int			as_nasyncresults;	/* # of valid entries in as_asyncresults */
+	bool		as_syncdone;	/* true if all synchronous plans done in
+								 * asynchronous mode, else false */
+	int			as_nasyncremain;	/* # of remaining asynchronous plans */
+	Bitmapset  *as_needrequest; /* asynchronous plans needing a new request */
+	struct WaitEventSet *as_eventset;	/* WaitEventSet used to configure file
+										 * descriptor wait events */
+	int			as_first_partial_plan;	/* Index of 'appendplans' containing
+										 * the first partial plan */
+	ParallelAppendState *as_pstate; /* parallel coordination info */
+	Size		pstate_len;		/* size of parallel coordination info */
+	struct PartitionPruneState *as_prune_state;
+	bool		as_valid_subplans_identified;	/* is as_valid_subplans valid? */
+	Bitmapset  *as_valid_subplans;
+	Bitmapset  *as_valid_asyncplans;	/* valid asynchronous plans indexes */
+	bool		(*choose_next_subplan) (AppendState *);
+};
+
+/* ----------------
+ *	 MergeAppendState information
+ *
+ *		nplans			how many plans are in the array
+ *		nkeys			number of sort key columns
+ *		sortkeys		sort keys in SortSupport representation
+ *		slots			current output tuple of each subplan
+ *		heap			heap of active tuples
+ *		initialized		true if we have fetched first tuple from each subplan
+ *		prune_state		details required to allow partitions to be
+ *						eliminated from the scan, or NULL if not possible.
+ *		valid_subplans	for runtime pruning, valid mergeplans indexes to
+ *						scan.
+ * ----------------
+ */
+typedef struct MergeAppendState
+{
+	PlanState	ps;				/* its first field is NodeTag */
+	PlanState **mergeplans;		/* array of PlanStates for my inputs */
+	int			ms_nplans;
+	int			ms_nkeys;
+	SortSupport ms_sortkeys;	/* array of length ms_nkeys */
+	TupleTableSlot **ms_slots;	/* array of length ms_nplans */
+	struct binaryheap *ms_heap; /* binary heap of slot indices */
+	bool		ms_initialized; /* are subplans started? */
+	struct PartitionPruneState *ms_prune_state;
+	Bitmapset  *ms_valid_subplans;
+} MergeAppendState;
+
+/* ----------------
+ *	 RecursiveUnionState information
+ *
+ *		RecursiveUnionState is used for performing a recursive union.
+ *
+ *		recursing			T when we're done scanning the non-recursive term
+ *		intermediate_empty	T if intermediate_table is currently empty
+ *		working_table		working table (to be scanned by recursive term)
+ *		intermediate_table	current recursive output (next generation of WT)
+ * ----------------
+ */
+typedef struct RecursiveUnionState
+{
+	PlanState	ps;				/* its first field is NodeTag */
+	bool		recursing;
+	bool		intermediate_empty;
+	Tuplestorestate *working_table;
+	Tuplestorestate *intermediate_table;
+	/* Remaining fields are unused in UNION ALL case */
+	Oid		   *eqfuncoids;		/* per-grouping-field equality fns */
+	FmgrInfo   *hashfunctions;	/* per-grouping-field hash fns */
+	MemoryContext tempContext;	/* short-term context for comparisons */
+	TupleHashTable hashtable;	/* hash table for tuples already seen */
+	MemoryContext tableContext; /* memory context containing hash table */
+} RecursiveUnionState;
+
+/* ----------------
+ *	 BitmapAndState information
+ * ----------------
+ */
+typedef struct BitmapAndState
+{
+	PlanState	ps;				/* its first field is NodeTag */
+	PlanState **bitmapplans;	/* array of PlanStates for my inputs */
+	int			nplans;			/* number of input plans */
+} BitmapAndState;
+
+/* ----------------
+ *	 BitmapOrState information
+ * ----------------
+ */
+typedef struct BitmapOrState
+{
+	PlanState	ps;				/* its first field is NodeTag */
+	PlanState **bitmapplans;	/* array of PlanStates for my inputs */
+	int			nplans;			/* number of input plans */
+} BitmapOrState;
+
+/* ----------------------------------------------------------------
+ *				 Scan State Information
+ * ----------------------------------------------------------------
+ */
+
+/* ----------------
+ *	 ScanState information
+ *
+ *		ScanState extends PlanState for node types that represent
+ *		scans of an underlying relation.  It can also be used for nodes
+ *		that scan the output of an underlying plan node --- in that case,
+ *		only ScanTupleSlot is actually useful, and it refers to the tuple
+ *		retrieved from the subplan.
+ *
+ *		currentRelation    relation being scanned (NULL if none)
+ *		currentScanDesc    current scan descriptor for scan (NULL if none)
+ *		ScanTupleSlot	   pointer to slot in tuple table holding scan tuple
+ * ----------------
+ */
+typedef struct ScanState
+{
+	PlanState	ps;				/* its first field is NodeTag */
+	Relation	ss_currentRelation;
+	struct TableScanDescData *ss_currentScanDesc;
+	TupleTableSlot *ss_ScanTupleSlot;
+} ScanState;
+
+/* ----------------
+ *	 SeqScanState information
+ * ----------------
+ */
+typedef struct SeqScanState
+{
+	ScanState	ss;				/* its first field is NodeTag */
+	Size		pscan_len;		/* size of parallel heap scan descriptor */
+} SeqScanState;
+
+/* ----------------
+ *	 SampleScanState information
+ * ----------------
+ */
+typedef struct SampleScanState
+{
+	ScanState	ss;
+	List	   *args;			/* expr states for TABLESAMPLE params */
+	ExprState  *repeatable;		/* expr state for REPEATABLE expr */
+	/* use struct pointer to avoid including tsmapi.h here */
+	struct TsmRoutine *tsmroutine;	/* descriptor for tablesample method */
+	void	   *tsm_state;		/* tablesample method can keep state here */
+	bool		use_bulkread;	/* use bulkread buffer access strategy? */
+	bool		use_pagemode;	/* use page-at-a-time visibility checking? */
+	bool		begun;			/* false means need to call BeginSampleScan */
+	uint32		seed;			/* random seed */
+	int64		donetuples;		/* number of tuples already returned */
+	bool		haveblock;		/* has a block for sampling been determined */
+	bool		done;			/* exhausted all tuples? */
+} SampleScanState;
+
+/*
+ * These structs store information about index quals that don't have simple
+ * constant right-hand sides.  See comments for ExecIndexBuildScanKeys()
+ * for discussion.
+ */
+typedef struct
+{
+	struct ScanKeyData *scan_key;	/* scankey to put value into */
+	ExprState  *key_expr;		/* expr to evaluate to get value */
+	bool		key_toastable;	/* is expr's result a toastable datatype? */
+} IndexRuntimeKeyInfo;
+
+typedef struct
+{
+	struct ScanKeyData *scan_key;	/* scankey to put value into */
+	ExprState  *array_expr;		/* expr to evaluate to get array value */
+	int			next_elem;		/* next array element to use */
+	int			num_elems;		/* number of elems in current array value */
+	Datum	   *elem_values;	/* array of num_elems Datums */
+	bool	   *elem_nulls;		/* array of num_elems is-null flags */
+} IndexArrayKeyInfo;
+
+/* ----------------
+ *	 IndexScanState information
+ *
+ *		indexqualorig	   execution state for indexqualorig expressions
+ *		indexorderbyorig   execution state for indexorderbyorig expressions
+ *		ScanKeys		   Skey structures for index quals
+ *		NumScanKeys		   number of ScanKeys
+ *		OrderByKeys		   Skey structures for index ordering operators
+ *		NumOrderByKeys	   number of OrderByKeys
+ *		RuntimeKeys		   info about Skeys that must be evaluated at runtime
+ *		NumRuntimeKeys	   number of RuntimeKeys
+ *		RuntimeKeysReady   true if runtime Skeys have been computed
+ *		RuntimeContext	   expr context for evaling runtime Skeys
+ *		RelationDesc	   index relation descriptor
+ *		ScanDesc		   index scan descriptor
+ *
+ *		ReorderQueue	   tuples that need reordering due to re-check
+ *		ReachedEnd		   have we fetched all tuples from index already?
+ *		OrderByValues	   values of ORDER BY exprs of last fetched tuple
+ *		OrderByNulls	   null flags for OrderByValues
+ *		SortSupport		   for reordering ORDER BY exprs
+ *		OrderByTypByVals   is the datatype of order by expression pass-by-value?
+ *		OrderByTypLens	   typlens of the datatypes of order by expressions
+ *		PscanLen		   size of parallel index scan descriptor
+ * ----------------
+ */
+typedef struct IndexScanState
+{
+	ScanState	ss;				/* its first field is NodeTag */
+	ExprState  *indexqualorig;
+	List	   *indexorderbyorig;
+	struct ScanKeyData *iss_ScanKeys;
+	int			iss_NumScanKeys;
+	struct ScanKeyData *iss_OrderByKeys;
+	int			iss_NumOrderByKeys;
+	IndexRuntimeKeyInfo *iss_RuntimeKeys;
+	int			iss_NumRuntimeKeys;
+	bool		iss_RuntimeKeysReady;
+	ExprContext *iss_RuntimeContext;
+	Relation	iss_RelationDesc;
+	struct IndexScanDescData *iss_ScanDesc;
+
+	/* These are needed for re-checking ORDER BY expr ordering */
+	pairingheap *iss_ReorderQueue;
+	bool		iss_ReachedEnd;
+	Datum	   *iss_OrderByValues;
+	bool	   *iss_OrderByNulls;
+	SortSupport iss_SortSupport;
+	bool	   *iss_OrderByTypByVals;
+	int16	   *iss_OrderByTypLens;
+	Size		iss_PscanLen;
+} IndexScanState;
+
+/* ----------------
+ *	 IndexOnlyScanState information
+ *
+ *		recheckqual		   execution state for recheckqual expressions
+ *		ScanKeys		   Skey structures for index quals
+ *		NumScanKeys		   number of ScanKeys
+ *		OrderByKeys		   Skey structures for index ordering operators
+ *		NumOrderByKeys	   number of OrderByKeys
+ *		RuntimeKeys		   info about Skeys that must be evaluated at runtime
+ *		NumRuntimeKeys	   number of RuntimeKeys
+ *		RuntimeKeysReady   true if runtime Skeys have been computed
+ *		RuntimeContext	   expr context for evaling runtime Skeys
+ *		RelationDesc	   index relation descriptor
+ *		ScanDesc		   index scan descriptor
+ *		TableSlot		   slot for holding tuples fetched from the table
+ *		VMBuffer		   buffer in use for visibility map testing, if any
+ *		PscanLen		   size of parallel index-only scan descriptor
+ * ----------------
+ */
+typedef struct IndexOnlyScanState
+{
+	ScanState	ss;				/* its first field is NodeTag */
+	ExprState  *recheckqual;
+	struct ScanKeyData *ioss_ScanKeys;
+	int			ioss_NumScanKeys;
+	struct ScanKeyData *ioss_OrderByKeys;
+	int			ioss_NumOrderByKeys;
+	IndexRuntimeKeyInfo *ioss_RuntimeKeys;
+	int			ioss_NumRuntimeKeys;
+	bool		ioss_RuntimeKeysReady;
+	ExprContext *ioss_RuntimeContext;
+	Relation	ioss_RelationDesc;
+	struct IndexScanDescData *ioss_ScanDesc;
+	TupleTableSlot *ioss_TableSlot;
+	Buffer		ioss_VMBuffer;
+	Size		ioss_PscanLen;
+} IndexOnlyScanState;
+
+/* ----------------
+ *	 BitmapIndexScanState information
+ *
+ *		result			   bitmap to return output into, or NULL
+ *		ScanKeys		   Skey structures for index quals
+ *		NumScanKeys		   number of ScanKeys
+ *		RuntimeKeys		   info about Skeys that must be evaluated at runtime
+ *		NumRuntimeKeys	   number of RuntimeKeys
+ *		ArrayKeys		   info about Skeys that come from ScalarArrayOpExprs
+ *		NumArrayKeys	   number of ArrayKeys
+ *		RuntimeKeysReady   true if runtime Skeys have been computed
+ *		RuntimeContext	   expr context for evaling runtime Skeys
+ *		RelationDesc	   index relation descriptor
+ *		ScanDesc		   index scan descriptor
+ * ----------------
+ */
+typedef struct BitmapIndexScanState
+{
+	ScanState	ss;				/* its first field is NodeTag */
+	TIDBitmap  *biss_result;
+	struct ScanKeyData *biss_ScanKeys;
+	int			biss_NumScanKeys;
+	IndexRuntimeKeyInfo *biss_RuntimeKeys;
+	int			biss_NumRuntimeKeys;
+	IndexArrayKeyInfo *biss_ArrayKeys;
+	int			biss_NumArrayKeys;
+	bool		biss_RuntimeKeysReady;
+	ExprContext *biss_RuntimeContext;
+	Relation	biss_RelationDesc;
+	struct IndexScanDescData *biss_ScanDesc;
+} BitmapIndexScanState;
+
+/* ----------------
+ *	 SharedBitmapState information
+ *
+ *		BM_INITIAL		TIDBitmap creation is not yet started, so first worker
+ *						to see this state will set the state to BM_INPROGRESS
+ *						and that process will be responsible for creating
+ *						TIDBitmap.
+ *		BM_INPROGRESS	TIDBitmap creation is in progress; workers need to
+ *						sleep until it's finished.
+ *		BM_FINISHED		TIDBitmap creation is done, so now all workers can
+ *						proceed to iterate over TIDBitmap.
+ * ----------------
+ */
+typedef enum
+{
+	BM_INITIAL,
+	BM_INPROGRESS,
+	BM_FINISHED
+} SharedBitmapState;
+
+/* ----------------
+ *	 ParallelBitmapHeapState information
+ *		tbmiterator				iterator for scanning current pages
+ *		prefetch_iterator		iterator for prefetching ahead of current page
+ *		mutex					mutual exclusion for the prefetching variable
+ *								and state
+ *		prefetch_pages			# pages prefetch iterator is ahead of current
+ *		prefetch_target			current target prefetch distance
+ *		state					current state of the TIDBitmap
+ *		cv						conditional wait variable
+ *		phs_snapshot_data		snapshot data shared to workers
+ * ----------------
+ */
+typedef struct ParallelBitmapHeapState
+{
+	dsa_pointer tbmiterator;
+	dsa_pointer prefetch_iterator;
+	slock_t		mutex;
+	int			prefetch_pages;
+	int			prefetch_target;
+	SharedBitmapState state;
+	ConditionVariable cv;
+	char		phs_snapshot_data[FLEXIBLE_ARRAY_MEMBER];
+} ParallelBitmapHeapState;
+
+/* ----------------
+ *	 BitmapHeapScanState information
+ *
+ *		bitmapqualorig	   execution state for bitmapqualorig expressions
+ *		tbm				   bitmap obtained from child index scan(s)
+ *		tbmiterator		   iterator for scanning current pages
+ *		tbmres			   current-page data
+ *		can_skip_fetch	   can we potentially skip tuple fetches in this scan?
+ *		return_empty_tuples number of empty tuples to return
+ *		vmbuffer		   buffer for visibility-map lookups
+ *		pvmbuffer		   ditto, for prefetched pages
+ *		exact_pages		   total number of exact pages retrieved
+ *		lossy_pages		   total number of lossy pages retrieved
+ *		prefetch_iterator  iterator for prefetching ahead of current page
+ *		prefetch_pages	   # pages prefetch iterator is ahead of current
+ *		prefetch_target    current target prefetch distance
+ *		prefetch_maximum   maximum value for prefetch_target
+ *		pscan_len		   size of the shared memory for parallel bitmap
+ *		initialized		   is node is ready to iterate
+ *		shared_tbmiterator	   shared iterator
+ *		shared_prefetch_iterator shared iterator for prefetching
+ *		pstate			   shared state for parallel bitmap scan
+ * ----------------
+ */
+typedef struct BitmapHeapScanState
+{
+	ScanState	ss;				/* its first field is NodeTag */
+	ExprState  *bitmapqualorig;
+	TIDBitmap  *tbm;
+	TBMIterator *tbmiterator;
+	TBMIterateResult *tbmres;
+	bool		can_skip_fetch;
+	int			return_empty_tuples;
+	Buffer		vmbuffer;
+	Buffer		pvmbuffer;
+	long		exact_pages;
+	long		lossy_pages;
+	TBMIterator *prefetch_iterator;
+	int			prefetch_pages;
+	int			prefetch_target;
+	int			prefetch_maximum;
+	Size		pscan_len;
+	bool		initialized;
+	TBMSharedIterator *shared_tbmiterator;
+	TBMSharedIterator *shared_prefetch_iterator;
+	ParallelBitmapHeapState *pstate;
+} BitmapHeapScanState;
+
+/* ----------------
+ *	 TidScanState information
+ *
+ *		tidexprs	   list of TidExpr structs (see nodeTidscan.c)
+ *		isCurrentOf    scan has a CurrentOfExpr qual
+ *		NumTids		   number of tids in this scan
+ *		TidPtr		   index of currently fetched tid
+ *		TidList		   evaluated item pointers (array of size NumTids)
+ *		htup		   currently-fetched tuple, if any
+ * ----------------
+ */
+typedef struct TidScanState
+{
+	ScanState	ss;				/* its first field is NodeTag */
+	List	   *tss_tidexprs;
+	bool		tss_isCurrentOf;
+	int			tss_NumTids;
+	int			tss_TidPtr;
+	ItemPointerData *tss_TidList;
+	HeapTupleData tss_htup;
+} TidScanState;
+
+/* ----------------
+ *	 TidRangeScanState information
+ *
+ *		trss_tidexprs		list of TidOpExpr structs (see nodeTidrangescan.c)
+ *		trss_mintid			the lowest TID in the scan range
+ *		trss_maxtid			the highest TID in the scan range
+ *		trss_inScan			is a scan currently in progress?
+ * ----------------
+ */
+typedef struct TidRangeScanState
+{
+	ScanState	ss;				/* its first field is NodeTag */
+	List	   *trss_tidexprs;
+	ItemPointerData trss_mintid;
+	ItemPointerData trss_maxtid;
+	bool		trss_inScan;
+} TidRangeScanState;
+
+/* ----------------
+ *	 SubqueryScanState information
+ *
+ *		SubqueryScanState is used for scanning a sub-query in the range table.
+ *		ScanTupleSlot references the current output tuple of the sub-query.
+ * ----------------
+ */
+typedef struct SubqueryScanState
+{
+	ScanState	ss;				/* its first field is NodeTag */
+	PlanState  *subplan;
+} SubqueryScanState;
+
+/* ----------------
+ *	 FunctionScanState information
+ *
+ *		Function nodes are used to scan the results of a
+ *		function appearing in FROM (typically a function returning set).
+ *
+ *		eflags				node's capability flags
+ *		ordinality			is this scan WITH ORDINALITY?
+ *		simple				true if we have 1 function and no ordinality
+ *		ordinal				current ordinal column value
+ *		nfuncs				number of functions being executed
+ *		funcstates			per-function execution states (private in
+ *							nodeFunctionscan.c)
+ *		argcontext			memory context to evaluate function arguments in
+ * ----------------
+ */
+struct FunctionScanPerFuncState;
+
+typedef struct FunctionScanState
+{
+	ScanState	ss;				/* its first field is NodeTag */
+	int			eflags;
+	bool		ordinality;
+	bool		simple;
+	int64		ordinal;
+	int			nfuncs;
+	struct FunctionScanPerFuncState *funcstates;	/* array of length nfuncs */
+	MemoryContext argcontext;
+} FunctionScanState;
+
+/* ----------------
+ *	 ValuesScanState information
+ *
+ *		ValuesScan nodes are used to scan the results of a VALUES list
+ *
+ *		rowcontext			per-expression-list context
+ *		exprlists			array of expression lists being evaluated
+ *		exprstatelists		array of expression state lists, for SubPlans only
+ *		array_len			size of above arrays
+ *		curr_idx			current array index (0-based)
+ *
+ *	Note: ss.ps.ps_ExprContext is used to evaluate any qual or projection
+ *	expressions attached to the node.  We create a second ExprContext,
+ *	rowcontext, in which to build the executor expression state for each
+ *	Values sublist.  Resetting this context lets us get rid of expression
+ *	state for each row, avoiding major memory leakage over a long values list.
+ *	However, that doesn't work for sublists containing SubPlans, because a
+ *	SubPlan has to be connected up to the outer plan tree to work properly.
+ *	Therefore, for only those sublists containing SubPlans, we do expression
+ *	state construction at executor start, and store those pointers in
+ *	exprstatelists[].  NULL entries in that array correspond to simple
+ *	subexpressions that are handled as described above.
+ * ----------------
+ */
+typedef struct ValuesScanState
+{
+	ScanState	ss;				/* its first field is NodeTag */
+	ExprContext *rowcontext;
+	List	  **exprlists;
+	List	  **exprstatelists;
+	int			array_len;
+	int			curr_idx;
+} ValuesScanState;
+
+/* ----------------
+ *		TableFuncScanState node
+ *
+ * Used in table-expression functions like XMLTABLE.
+ * ----------------
+ */
+typedef struct TableFuncScanState
+{
+	ScanState	ss;				/* its first field is NodeTag */
+	ExprState  *docexpr;		/* state for document expression */
+	ExprState  *rowexpr;		/* state for row-generating expression */
+	List	   *colexprs;		/* state for column-generating expression */
+	List	   *coldefexprs;	/* state for column default expressions */
+	List	   *ns_names;		/* same as TableFunc.ns_names */
+	List	   *ns_uris;		/* list of states of namespace URI exprs */
+	Bitmapset  *notnulls;		/* nullability flag for each output column */
+	void	   *opaque;			/* table builder private space */
+	const struct TableFuncRoutine *routine; /* table builder methods */
+	FmgrInfo   *in_functions;	/* input function for each column */
+	Oid		   *typioparams;	/* typioparam for each column */
+	int64		ordinal;		/* row number to be output next */
+	MemoryContext perTableCxt;	/* per-table context */
+	Tuplestorestate *tupstore;	/* output tuple store */
+} TableFuncScanState;
+
+/* ----------------
+ *	 CteScanState information
+ *
+ *		CteScan nodes are used to scan a CommonTableExpr query.
+ *
+ * Multiple CteScan nodes can read out from the same CTE query.  We use
+ * a tuplestore to hold rows that have been read from the CTE query but
+ * not yet consumed by all readers.
+ * ----------------
+ */
+typedef struct CteScanState
+{
+	ScanState	ss;				/* its first field is NodeTag */
+	int			eflags;			/* capability flags to pass to tuplestore */
+	int			readptr;		/* index of my tuplestore read pointer */
+	PlanState  *cteplanstate;	/* PlanState for the CTE query itself */
+	/* Link to the "leader" CteScanState (possibly this same node) */
+	struct CteScanState *leader;
+	/* The remaining fields are only valid in the "leader" CteScanState */
+	Tuplestorestate *cte_table; /* rows already read from the CTE query */
+	bool		eof_cte;		/* reached end of CTE query? */
+} CteScanState;
+
+/* ----------------
+ *	 NamedTuplestoreScanState information
+ *
+ *		NamedTuplestoreScan nodes are used to scan a Tuplestore created and
+ *		named prior to execution of the query.  An example is a transition
+ *		table for an AFTER trigger.
+ *
+ * Multiple NamedTuplestoreScan nodes can read out from the same Tuplestore.
+ * ----------------
+ */
+typedef struct NamedTuplestoreScanState
+{
+	ScanState	ss;				/* its first field is NodeTag */
+	int			readptr;		/* index of my tuplestore read pointer */
+	TupleDesc	tupdesc;		/* format of the tuples in the tuplestore */
+	Tuplestorestate *relation;	/* the rows */
+} NamedTuplestoreScanState;
+
+/* ----------------
+ *	 WorkTableScanState information
+ *
+ *		WorkTableScan nodes are used to scan the work table created by
+ *		a RecursiveUnion node.  We locate the RecursiveUnion node
+ *		during executor startup.
+ * ----------------
+ */
+typedef struct WorkTableScanState
+{
+	ScanState	ss;				/* its first field is NodeTag */
+	RecursiveUnionState *rustate;
+} WorkTableScanState;
+
+/* ----------------
+ *	 ForeignScanState information
+ *
+ *		ForeignScan nodes are used to scan foreign-data tables.
+ * ----------------
+ */
+typedef struct ForeignScanState
+{
+	ScanState	ss;				/* its first field is NodeTag */
+	ExprState  *fdw_recheck_quals;	/* original quals not in ss.ps.qual */
+	Size		pscan_len;		/* size of parallel coordination information */
+	ResultRelInfo *resultRelInfo;	/* result rel info, if UPDATE or DELETE */
+	/* use struct pointer to avoid including fdwapi.h here */
+	struct FdwRoutine *fdwroutine;
+	void	   *fdw_state;		/* foreign-data wrapper can keep state here */
+} ForeignScanState;
+
+/* ----------------
+ *	 CustomScanState information
+ *
+ *		CustomScan nodes are used to execute custom code within executor.
+ *
+ * Core code must avoid assuming that the CustomScanState is only as large as
+ * the structure declared here; providers are allowed to make it the first
+ * element in a larger structure, and typically would need to do so.  The
+ * struct is actually allocated by the CreateCustomScanState method associated
+ * with the plan node.  Any additional fields can be initialized there, or in
+ * the BeginCustomScan method.
+ * ----------------
+ */
+struct CustomExecMethods;
+
+typedef struct CustomScanState
+{
+	ScanState	ss;
+	uint32		flags;			/* mask of CUSTOMPATH_* flags, see
+								 * nodes/extensible.h */
+	List	   *custom_ps;		/* list of child PlanState nodes, if any */
+	Size		pscan_len;		/* size of parallel coordination information */
+	const struct CustomExecMethods *methods;
+	const struct TupleTableSlotOps *slotOps;
+} CustomScanState;
+
+/* ----------------------------------------------------------------
+ *				 Join State Information
+ * ----------------------------------------------------------------
+ */
+
+/* ----------------
+ *	 JoinState information
+ *
+ *		Superclass for state nodes of join plans.
+ * ----------------
+ */
+typedef struct JoinState
+{
+	PlanState	ps;
+	JoinType	jointype;
+	bool		single_match;	/* True if we should skip to next outer tuple
+								 * after finding one inner match */
+	ExprState  *joinqual;		/* JOIN quals (in addition to ps.qual) */
+} JoinState;
+
+/* ----------------
+ *	 NestLoopState information
+ *
+ *		NeedNewOuter	   true if need new outer tuple on next call
+ *		MatchedOuter	   true if found a join match for current outer tuple
+ *		NullInnerTupleSlot prepared null tuple for left outer joins
+ * ----------------
+ */
+typedef struct NestLoopState
+{
+	JoinState	js;				/* its first field is NodeTag */
+	bool		nl_NeedNewOuter;
+	bool		nl_MatchedOuter;
+	TupleTableSlot *nl_NullInnerTupleSlot;
+} NestLoopState;
+
+/* ----------------
+ *	 MergeJoinState information
+ *
+ *		NumClauses		   number of mergejoinable join clauses
+ *		Clauses			   info for each mergejoinable clause
+ *		JoinState		   current state of ExecMergeJoin state machine
+ *		SkipMarkRestore    true if we may skip Mark and Restore operations
+ *		ExtraMarks		   true to issue extra Mark operations on inner scan
+ *		ConstFalseJoin	   true if we have a constant-false joinqual
+ *		FillOuter		   true if should emit unjoined outer tuples anyway
+ *		FillInner		   true if should emit unjoined inner tuples anyway
+ *		MatchedOuter	   true if found a join match for current outer tuple
+ *		MatchedInner	   true if found a join match for current inner tuple
+ *		OuterTupleSlot	   slot in tuple table for cur outer tuple
+ *		InnerTupleSlot	   slot in tuple table for cur inner tuple
+ *		MarkedTupleSlot    slot in tuple table for marked tuple
+ *		NullOuterTupleSlot prepared null tuple for right outer joins
+ *		NullInnerTupleSlot prepared null tuple for left outer joins
+ *		OuterEContext	   workspace for computing outer tuple's join values
+ *		InnerEContext	   workspace for computing inner tuple's join values
+ * ----------------
+ */
+/* private in nodeMergejoin.c: */
+typedef struct MergeJoinClauseData *MergeJoinClause;
+
+typedef struct MergeJoinState
+{
+	JoinState	js;				/* its first field is NodeTag */
+	int			mj_NumClauses;
+	MergeJoinClause mj_Clauses; /* array of length mj_NumClauses */
+	int			mj_JoinState;
+	bool		mj_SkipMarkRestore;
+	bool		mj_ExtraMarks;
+	bool		mj_ConstFalseJoin;
+	bool		mj_FillOuter;
+	bool		mj_FillInner;
+	bool		mj_MatchedOuter;
+	bool		mj_MatchedInner;
+	TupleTableSlot *mj_OuterTupleSlot;
+	TupleTableSlot *mj_InnerTupleSlot;
+	TupleTableSlot *mj_MarkedTupleSlot;
+	TupleTableSlot *mj_NullOuterTupleSlot;
+	TupleTableSlot *mj_NullInnerTupleSlot;
+	ExprContext *mj_OuterEContext;
+	ExprContext *mj_InnerEContext;
+} MergeJoinState;
+
+/* ----------------
+ *	 HashJoinState information
+ *
+ *		hashclauses				original form of the hashjoin condition
+ *		hj_OuterHashKeys		the outer hash keys in the hashjoin condition
+ *		hj_HashOperators		the join operators in the hashjoin condition
+ *		hj_HashTable			hash table for the hashjoin
+ *								(NULL if table not built yet)
+ *		hj_CurHashValue			hash value for current outer tuple
+ *		hj_CurBucketNo			regular bucket# for current outer tuple
+ *		hj_CurSkewBucketNo		skew bucket# for current outer tuple
+ *		hj_CurTuple				last inner tuple matched to current outer
+ *								tuple, or NULL if starting search
+ *								(hj_CurXXX variables are undefined if
+ *								OuterTupleSlot is empty!)
+ *		hj_OuterTupleSlot		tuple slot for outer tuples
+ *		hj_HashTupleSlot		tuple slot for inner (hashed) tuples
+ *		hj_NullOuterTupleSlot	prepared null tuple for right/right-anti/full
+ *								outer joins
+ *		hj_NullInnerTupleSlot	prepared null tuple for left/full outer joins
+ *		hj_FirstOuterTupleSlot	first tuple retrieved from outer plan
+ *		hj_JoinState			current state of ExecHashJoin state machine
+ *		hj_MatchedOuter			true if found a join match for current outer
+ *		hj_OuterNotEmpty		true if outer relation known not empty
+ * ----------------
+ */
+
+/* these structs are defined in executor/hashjoin.h: */
+typedef struct HashJoinTupleData *HashJoinTuple;
+typedef struct HashJoinTableData *HashJoinTable;
+
+typedef struct HashJoinState
+{
+	JoinState	js;				/* its first field is NodeTag */
+	ExprState  *hashclauses;
+	List	   *hj_OuterHashKeys;	/* list of ExprState nodes */
+	List	   *hj_HashOperators;	/* list of operator OIDs */
+	List	   *hj_Collations;
+	HashJoinTable hj_HashTable;
+	uint32		hj_CurHashValue;
+	int			hj_CurBucketNo;
+	int			hj_CurSkewBucketNo;
+	HashJoinTuple hj_CurTuple;
+	TupleTableSlot *hj_OuterTupleSlot;
+	TupleTableSlot *hj_HashTupleSlot;
+	TupleTableSlot *hj_NullOuterTupleSlot;
+	TupleTableSlot *hj_NullInnerTupleSlot;
+	TupleTableSlot *hj_FirstOuterTupleSlot;
+	int			hj_JoinState;
+	bool		hj_MatchedOuter;
+	bool		hj_OuterNotEmpty;
+} HashJoinState;
+
+
+/* ----------------------------------------------------------------
+ *				 Materialization State Information
+ * ----------------------------------------------------------------
+ */
+
+/* ----------------
+ *	 MaterialState information
+ *
+ *		materialize nodes are used to materialize the results
+ *		of a subplan into a temporary file.
+ *
+ *		ss.ss_ScanTupleSlot refers to output of underlying plan.
+ * ----------------
+ */
+typedef struct MaterialState
+{
+	ScanState	ss;				/* its first field is NodeTag */
+	int			eflags;			/* capability flags to pass to tuplestore */
+	bool		eof_underlying; /* reached end of underlying plan? */
+	Tuplestorestate *tuplestorestate;
+} MaterialState;
+
+struct MemoizeEntry;
+struct MemoizeTuple;
+struct MemoizeKey;
+
+typedef struct MemoizeInstrumentation
+{
+	uint64		cache_hits;		/* number of rescans where we've found the
+								 * scan parameter values to be cached */
+	uint64		cache_misses;	/* number of rescans where we've not found the
+								 * scan parameter values to be cached. */
+	uint64		cache_evictions;	/* number of cache entries removed due to
+									 * the need to free memory */
+	uint64		cache_overflows;	/* number of times we've had to bypass the
+									 * cache when filling it due to not being
+									 * able to free enough space to store the
+									 * current scan's tuples. */
+	uint64		mem_peak;		/* peak memory usage in bytes */
+} MemoizeInstrumentation;
+
+/* ----------------
+ *	 Shared memory container for per-worker memoize information
+ * ----------------
+ */
+typedef struct SharedMemoizeInfo
+{
+	int			num_workers;
+	MemoizeInstrumentation sinstrument[FLEXIBLE_ARRAY_MEMBER];
+} SharedMemoizeInfo;
+
+/* ----------------
+ *	 MemoizeState information
+ *
+ *		memoize nodes are used to cache recent and commonly seen results from
+ *		a parameterized scan.
+ * ----------------
+ */
+typedef struct MemoizeState
+{
+	ScanState	ss;				/* its first field is NodeTag */
+	int			mstatus;		/* value of ExecMemoize state machine */
+	int			nkeys;			/* number of cache keys */
+	struct memoize_hash *hashtable; /* hash table for cache entries */
+	TupleDesc	hashkeydesc;	/* tuple descriptor for cache keys */
+	TupleTableSlot *tableslot;	/* min tuple slot for existing cache entries */
+	TupleTableSlot *probeslot;	/* virtual slot used for hash lookups */
+	ExprState  *cache_eq_expr;	/* Compare exec params to hash key */
+	ExprState **param_exprs;	/* exprs containing the parameters to this
+								 * node */
+	FmgrInfo   *hashfunctions;	/* lookup data for hash funcs nkeys in size */
+	Oid		   *collations;		/* collation for comparisons nkeys in size */
+	uint64		mem_used;		/* bytes of memory used by cache */
+	uint64		mem_limit;		/* memory limit in bytes for the cache */
+	MemoryContext tableContext; /* memory context to store cache data */
+	dlist_head	lru_list;		/* least recently used entry list */
+	struct MemoizeTuple *last_tuple;	/* Used to point to the last tuple
+										 * returned during a cache hit and the
+										 * tuple we last stored when
+										 * populating the cache. */
+	struct MemoizeEntry *entry; /* the entry that 'last_tuple' belongs to or
+								 * NULL if 'last_tuple' is NULL. */
+	bool		singlerow;		/* true if the cache entry is to be marked as
+								 * complete after caching the first tuple. */
+	bool		binary_mode;	/* true when cache key should be compared bit
+								 * by bit, false when using hash equality ops */
+	MemoizeInstrumentation stats;	/* execution statistics */
+	SharedMemoizeInfo *shared_info; /* statistics for parallel workers */
+	Bitmapset  *keyparamids;	/* Param->paramids of expressions belonging to
+								 * param_exprs */
+} MemoizeState;
+
+/* ----------------
+ *	 When performing sorting by multiple keys, it's possible that the input
+ *	 dataset is already sorted on a prefix of those keys. We call these
+ *	 "presorted keys".
+ *	 PresortedKeyData represents information about one such key.
+ * ----------------
+ */
+typedef struct PresortedKeyData
+{
+	FmgrInfo	flinfo;			/* comparison function info */
+	FunctionCallInfo fcinfo;	/* comparison function call info */
+	OffsetNumber attno;			/* attribute number in tuple */
+} PresortedKeyData;
+
+/* ----------------
+ *	 Shared memory container for per-worker sort information
+ * ----------------
+ */
+typedef struct SharedSortInfo
+{
+	int			num_workers;
+	TuplesortInstrumentation sinstrument[FLEXIBLE_ARRAY_MEMBER];
+} SharedSortInfo;
+
+/* ----------------
+ *	 SortState information
+ * ----------------
+ */
+typedef struct SortState
+{
+	ScanState	ss;				/* its first field is NodeTag */
+	bool		randomAccess;	/* need random access to sort output? */
+	bool		bounded;		/* is the result set bounded? */
+	int64		bound;			/* if bounded, how many tuples are needed */
+	bool		sort_Done;		/* sort completed yet? */
+	bool		bounded_Done;	/* value of bounded we did the sort with */
+	int64		bound_Done;		/* value of bound we did the sort with */
+	void	   *tuplesortstate; /* private state of tuplesort.c */
+	bool		am_worker;		/* are we a worker? */
+	bool		datumSort;		/* Datum sort instead of tuple sort? */
+	SharedSortInfo *shared_info;	/* one entry per worker */
+} SortState;
+
+/* ----------------
+ *	 Instrumentation information for IncrementalSort
+ * ----------------
+ */
+typedef struct IncrementalSortGroupInfo
+{
+	int64		groupCount;
+	int64		maxDiskSpaceUsed;
+	int64		totalDiskSpaceUsed;
+	int64		maxMemorySpaceUsed;
+	int64		totalMemorySpaceUsed;
+	bits32		sortMethods;	/* bitmask of TuplesortMethod */
+} IncrementalSortGroupInfo;
+
+typedef struct IncrementalSortInfo
+{
+	IncrementalSortGroupInfo fullsortGroupInfo;
+	IncrementalSortGroupInfo prefixsortGroupInfo;
+} IncrementalSortInfo;
+
+/* ----------------
+ *	 Shared memory container for per-worker incremental sort information
+ * ----------------
+ */
+typedef struct SharedIncrementalSortInfo
+{
+	int			num_workers;
+	IncrementalSortInfo sinfo[FLEXIBLE_ARRAY_MEMBER];
+} SharedIncrementalSortInfo;
+
+/* ----------------
+ *	 IncrementalSortState information
+ * ----------------
+ */
+typedef enum
+{
+	INCSORT_LOADFULLSORT,
+	INCSORT_LOADPREFIXSORT,
+	INCSORT_READFULLSORT,
+	INCSORT_READPREFIXSORT,
+} IncrementalSortExecutionStatus;
+
+typedef struct IncrementalSortState
+{
+	ScanState	ss;				/* its first field is NodeTag */
+	bool		bounded;		/* is the result set bounded? */
+	int64		bound;			/* if bounded, how many tuples are needed */
+	bool		outerNodeDone;	/* finished fetching tuples from outer node */
+	int64		bound_Done;		/* value of bound we did the sort with */
+	IncrementalSortExecutionStatus execution_status;
+	int64		n_fullsort_remaining;
+	Tuplesortstate *fullsort_state; /* private state of tuplesort.c */
+	Tuplesortstate *prefixsort_state;	/* private state of tuplesort.c */
+	/* the keys by which the input path is already sorted */
+	PresortedKeyData *presorted_keys;
+
+	IncrementalSortInfo incsort_info;
+
+	/* slot for pivot tuple defining values of presorted keys within group */
+	TupleTableSlot *group_pivot;
+	TupleTableSlot *transfer_tuple;
+	bool		am_worker;		/* are we a worker? */
+	SharedIncrementalSortInfo *shared_info; /* one entry per worker */
+} IncrementalSortState;
+
+/* ---------------------
+ *	GroupState information
+ * ---------------------
+ */
+typedef struct GroupState
+{
+	ScanState	ss;				/* its first field is NodeTag */
+	ExprState  *eqfunction;		/* equality function */
+	bool		grp_done;		/* indicates completion of Group scan */
+} GroupState;
+
+/* ---------------------
+ *	per-worker aggregate information
+ * ---------------------
+ */
+typedef struct AggregateInstrumentation
+{
+	Size		hash_mem_peak;	/* peak hash table memory usage */
+	uint64		hash_disk_used; /* kB of disk space used */
+	int			hash_batches_used;	/* batches used during entire execution */
+} AggregateInstrumentation;
+
+/* ----------------
+ *	 Shared memory container for per-worker aggregate information
+ * ----------------
+ */
+typedef struct SharedAggInfo
+{
+	int			num_workers;
+	AggregateInstrumentation sinstrument[FLEXIBLE_ARRAY_MEMBER];
+} SharedAggInfo;
+
+/* ---------------------
+ *	AggState information
+ *
+ *	ss.ss_ScanTupleSlot refers to output of underlying plan.
+ *
+ *	Note: ss.ps.ps_ExprContext contains ecxt_aggvalues and
+ *	ecxt_aggnulls arrays, which hold the computed agg values for the current
+ *	input group during evaluation of an Agg node's output tuple(s).  We
+ *	create a second ExprContext, tmpcontext, in which to evaluate input
+ *	expressions and run the aggregate transition functions.
+ * ---------------------
+ */
+/* these structs are private in nodeAgg.c: */
+typedef struct AggStatePerAggData *AggStatePerAgg;
+typedef struct AggStatePerTransData *AggStatePerTrans;
+typedef struct AggStatePerGroupData *AggStatePerGroup;
+typedef struct AggStatePerPhaseData *AggStatePerPhase;
+typedef struct AggStatePerHashData *AggStatePerHash;
+
+typedef struct AggState
+{
+	ScanState	ss;				/* its first field is NodeTag */
+	List	   *aggs;			/* all Aggref nodes in targetlist & quals */
+	int			numaggs;		/* length of list (could be zero!) */
+	int			numtrans;		/* number of pertrans items */
+	AggStrategy aggstrategy;	/* strategy mode */
+	AggSplit	aggsplit;		/* agg-splitting mode, see nodes.h */
+	AggStatePerPhase phase;		/* pointer to current phase data */
+	int			numphases;		/* number of phases (including phase 0) */
+	int			current_phase;	/* current phase number */
+	AggStatePerAgg peragg;		/* per-Aggref information */
+	AggStatePerTrans pertrans;	/* per-Trans state information */
+	ExprContext *hashcontext;	/* econtexts for long-lived data (hashtable) */
+	ExprContext **aggcontexts;	/* econtexts for long-lived data (per GS) */
+	ExprContext *tmpcontext;	/* econtext for input expressions */
+#define FIELDNO_AGGSTATE_CURAGGCONTEXT 14
+	ExprContext *curaggcontext; /* currently active aggcontext */
+	AggStatePerAgg curperagg;	/* currently active aggregate, if any */
+#define FIELDNO_AGGSTATE_CURPERTRANS 16
+	AggStatePerTrans curpertrans;	/* currently active trans state, if any */
+	bool		input_done;		/* indicates end of input */
+	bool		agg_done;		/* indicates completion of Agg scan */
+	int			projected_set;	/* The last projected grouping set */
+#define FIELDNO_AGGSTATE_CURRENT_SET 20
+	int			current_set;	/* The current grouping set being evaluated */
+	Bitmapset  *grouped_cols;	/* grouped cols in current projection */
+	List	   *all_grouped_cols;	/* list of all grouped cols in DESC order */
+	Bitmapset  *colnos_needed;	/* all columns needed from the outer plan */
+	int			max_colno_needed;	/* highest colno needed from outer plan */
+	bool		all_cols_needed;	/* are all cols from outer plan needed? */
+	/* These fields are for grouping set phase data */
+	int			maxsets;		/* The max number of sets in any phase */
+	AggStatePerPhase phases;	/* array of all phases */
+	Tuplesortstate *sort_in;	/* sorted input to phases > 1 */
+	Tuplesortstate *sort_out;	/* input is copied here for next phase */
+	TupleTableSlot *sort_slot;	/* slot for sort results */
+	/* these fields are used in AGG_PLAIN and AGG_SORTED modes: */
+	AggStatePerGroup *pergroups;	/* grouping set indexed array of per-group
+									 * pointers */
+	HeapTuple	grp_firstTuple; /* copy of first tuple of current group */
+	/* these fields are used in AGG_HASHED and AGG_MIXED modes: */
+	bool		table_filled;	/* hash table filled yet? */
+	int			num_hashes;
+	MemoryContext hash_metacxt; /* memory for hash table itself */
+	struct LogicalTapeSet *hash_tapeset;	/* tape set for hash spill tapes */
+	struct HashAggSpill *hash_spills;	/* HashAggSpill for each grouping set,
+										 * exists only during first pass */
+	TupleTableSlot *hash_spill_rslot;	/* for reading spill files */
+	TupleTableSlot *hash_spill_wslot;	/* for writing spill files */
+	List	   *hash_batches;	/* hash batches remaining to be processed */
+	bool		hash_ever_spilled;	/* ever spilled during this execution? */
+	bool		hash_spill_mode;	/* we hit a limit during the current batch
+									 * and we must not create new groups */
+	Size		hash_mem_limit; /* limit before spilling hash table */
+	uint64		hash_ngroups_limit; /* limit before spilling hash table */
+	int			hash_planned_partitions;	/* number of partitions planned
+											 * for first pass */
+	double		hashentrysize;	/* estimate revised during execution */
+	Size		hash_mem_peak;	/* peak hash table memory usage */
+	uint64		hash_ngroups_current;	/* number of groups currently in
+										 * memory in all hash tables */
+	uint64		hash_disk_used; /* kB of disk space used */
+	int			hash_batches_used;	/* batches used during entire execution */
+
+	AggStatePerHash perhash;	/* array of per-hashtable data */
+	AggStatePerGroup *hash_pergroup;	/* grouping set indexed array of
+										 * per-group pointers */
+
+	/* support for evaluation of agg input expressions: */
+#define FIELDNO_AGGSTATE_ALL_PERGROUPS 53
+	AggStatePerGroup *all_pergroups;	/* array of first ->pergroups, than
+										 * ->hash_pergroup */
+	ProjectionInfo *combinedproj;	/* projection machinery */
+	SharedAggInfo *shared_info; /* one entry per worker */
+} AggState;
+
+/* ----------------
+ *	WindowAggState information
+ * ----------------
+ */
+/* these structs are private in nodeWindowAgg.c: */
+typedef struct WindowStatePerFuncData *WindowStatePerFunc;
+typedef struct WindowStatePerAggData *WindowStatePerAgg;
+
+/*
+ * WindowAggStatus -- Used to track the status of WindowAggState
+ */
+typedef enum WindowAggStatus
+{
+	WINDOWAGG_DONE,				/* No more processing to do */
+	WINDOWAGG_RUN,				/* Normal processing of window funcs */
+	WINDOWAGG_PASSTHROUGH,		/* Don't eval window funcs */
+	WINDOWAGG_PASSTHROUGH_STRICT	/* Pass-through plus don't store new
+									 * tuples during spool */
+} WindowAggStatus;
+
+typedef struct WindowAggState
+{
+	ScanState	ss;				/* its first field is NodeTag */
+
+	/* these fields are filled in by ExecInitExpr: */
+	List	   *funcs;			/* all WindowFunc nodes in targetlist */
+	int			numfuncs;		/* total number of window functions */
+	int			numaggs;		/* number that are plain aggregates */
+
+	WindowStatePerFunc perfunc; /* per-window-function information */
+	WindowStatePerAgg peragg;	/* per-plain-aggregate information */
+	ExprState  *partEqfunction; /* equality funcs for partition columns */
+	ExprState  *ordEqfunction;	/* equality funcs for ordering columns */
+	Tuplestorestate *buffer;	/* stores rows of current partition */
+	int			current_ptr;	/* read pointer # for current row */
+	int			framehead_ptr;	/* read pointer # for frame head, if used */
+	int			frametail_ptr;	/* read pointer # for frame tail, if used */
+	int			grouptail_ptr;	/* read pointer # for group tail, if used */
+	int64		spooled_rows;	/* total # of rows in buffer */
+	int64		currentpos;		/* position of current row in partition */
+	int64		frameheadpos;	/* current frame head position */
+	int64		frametailpos;	/* current frame tail position (frame end+1) */
+	/* use struct pointer to avoid including windowapi.h here */
+	struct WindowObjectData *agg_winobj;	/* winobj for aggregate fetches */
+	int64		aggregatedbase; /* start row for current aggregates */
+	int64		aggregatedupto; /* rows before this one are aggregated */
+	WindowAggStatus status;		/* run status of WindowAggState */
+
+	int			frameOptions;	/* frame_clause options, see WindowDef */
+	ExprState  *startOffset;	/* expression for starting bound offset */
+	ExprState  *endOffset;		/* expression for ending bound offset */
+	Datum		startOffsetValue;	/* result of startOffset evaluation */
+	Datum		endOffsetValue; /* result of endOffset evaluation */
+
+	/* these fields are used with RANGE offset PRECEDING/FOLLOWING: */
+	FmgrInfo	startInRangeFunc;	/* in_range function for startOffset */
+	FmgrInfo	endInRangeFunc; /* in_range function for endOffset */
+	Oid			inRangeColl;	/* collation for in_range tests */
+	bool		inRangeAsc;		/* use ASC sort order for in_range tests? */
+	bool		inRangeNullsFirst;	/* nulls sort first for in_range tests? */
+
+	/* these fields are used in GROUPS mode: */
+	int64		currentgroup;	/* peer group # of current row in partition */
+	int64		frameheadgroup; /* peer group # of frame head row */
+	int64		frametailgroup; /* peer group # of frame tail row */
+	int64		groupheadpos;	/* current row's peer group head position */
+	int64		grouptailpos;	/* " " " " tail position (group end+1) */
+
+	MemoryContext partcontext;	/* context for partition-lifespan data */
+	MemoryContext aggcontext;	/* shared context for aggregate working data */
+	MemoryContext curaggcontext;	/* current aggregate's working data */
+	ExprContext *tmpcontext;	/* short-term evaluation context */
+
+	ExprState  *runcondition;	/* Condition which must remain true otherwise
+								 * execution of the WindowAgg will finish or
+								 * go into pass-through mode.  NULL when there
+								 * is no such condition. */
+
+	bool		use_pass_through;	/* When false, stop execution when
+									 * runcondition is no longer true.  Else
+									 * just stop evaluating window funcs. */
+	bool		top_window;		/* true if this is the top-most WindowAgg or
+								 * the only WindowAgg in this query level */
+	bool		all_first;		/* true if the scan is starting */
+	bool		partition_spooled;	/* true if all tuples in current partition
+									 * have been spooled into tuplestore */
+	bool		more_partitions;	/* true if there's more partitions after
+									 * this one */
+	bool		framehead_valid;	/* true if frameheadpos is known up to
+									 * date for current row */
+	bool		frametail_valid;	/* true if frametailpos is known up to
+									 * date for current row */
+	bool		grouptail_valid;	/* true if grouptailpos is known up to
+									 * date for current row */
+
+	TupleTableSlot *first_part_slot;	/* first tuple of current or next
+										 * partition */
+	TupleTableSlot *framehead_slot; /* first tuple of current frame */
+	TupleTableSlot *frametail_slot; /* first tuple after current frame */
+
+	/* temporary slots for tuples fetched back from tuplestore */
+	TupleTableSlot *agg_row_slot;
+	TupleTableSlot *temp_slot_1;
+	TupleTableSlot *temp_slot_2;
+} WindowAggState;
+
+/* ----------------
+ *	 UniqueState information
+ *
+ *		Unique nodes are used "on top of" sort nodes to discard
+ *		duplicate tuples returned from the sort phase.  Basically
+ *		all it does is compare the current tuple from the subplan
+ *		with the previously fetched tuple (stored in its result slot).
+ *		If the two are identical in all interesting fields, then
+ *		we just fetch another tuple from the sort and try again.
+ * ----------------
+ */
+typedef struct UniqueState
+{
+	PlanState	ps;				/* its first field is NodeTag */
+	ExprState  *eqfunction;		/* tuple equality qual */
+} UniqueState;
+
+/* ----------------
+ * GatherState information
+ *
+ *		Gather nodes launch 1 or more parallel workers, run a subplan
+ *		in those workers, and collect the results.
+ * ----------------
+ */
+typedef struct GatherState
+{
+	PlanState	ps;				/* its first field is NodeTag */
+	bool		initialized;	/* workers launched? */
+	bool		need_to_scan_locally;	/* need to read from local plan? */
+	int64		tuples_needed;	/* tuple bound, see ExecSetTupleBound */
+	/* these fields are set up once: */
+	TupleTableSlot *funnel_slot;
+	struct ParallelExecutorInfo *pei;
+	/* all remaining fields are reinitialized during a rescan: */
+	int			nworkers_launched;	/* original number of workers */
+	int			nreaders;		/* number of still-active workers */
+	int			nextreader;		/* next one to try to read from */
+	struct TupleQueueReader **reader;	/* array with nreaders active entries */
+} GatherState;
+
+/* ----------------
+ * GatherMergeState information
+ *
+ *		Gather merge nodes launch 1 or more parallel workers, run a
+ *		subplan which produces sorted output in each worker, and then
+ *		merge the results into a single sorted stream.
+ * ----------------
+ */
+struct GMReaderTupleBuffer;		/* private in nodeGatherMerge.c */
+
+typedef struct GatherMergeState
+{
+	PlanState	ps;				/* its first field is NodeTag */
+	bool		initialized;	/* workers launched? */
+	bool		gm_initialized; /* gather_merge_init() done? */
+	bool		need_to_scan_locally;	/* need to read from local plan? */
+	int64		tuples_needed;	/* tuple bound, see ExecSetTupleBound */
+	/* these fields are set up once: */
+	TupleDesc	tupDesc;		/* descriptor for subplan result tuples */
+	int			gm_nkeys;		/* number of sort columns */
+	SortSupport gm_sortkeys;	/* array of length gm_nkeys */
+	struct ParallelExecutorInfo *pei;
+	/* all remaining fields are reinitialized during a rescan */
+	/* (but the arrays are not reallocated, just cleared) */
+	int			nworkers_launched;	/* original number of workers */
+	int			nreaders;		/* number of active workers */
+	TupleTableSlot **gm_slots;	/* array with nreaders+1 entries */
+	struct TupleQueueReader **reader;	/* array with nreaders active entries */
+	struct GMReaderTupleBuffer *gm_tuple_buffers;	/* nreaders tuple buffers */
+	struct binaryheap *gm_heap; /* binary heap of slot indices */
+} GatherMergeState;
+
+/* ----------------
+ *	 Values displayed by EXPLAIN ANALYZE
+ * ----------------
+ */
+typedef struct HashInstrumentation
+{
+	int			nbuckets;		/* number of buckets at end of execution */
+	int			nbuckets_original;	/* planned number of buckets */
+	int			nbatch;			/* number of batches at end of execution */
+	int			nbatch_original;	/* planned number of batches */
+	Size		space_peak;		/* peak memory usage in bytes */
+} HashInstrumentation;
+
+/* ----------------
+ *	 Shared memory container for per-worker hash information
+ * ----------------
+ */
+typedef struct SharedHashInfo
+{
+	int			num_workers;
+	HashInstrumentation hinstrument[FLEXIBLE_ARRAY_MEMBER];
+} SharedHashInfo;
+
+/* ----------------
+ *	 HashState information
+ * ----------------
+ */
+typedef struct HashState
+{
+	PlanState	ps;				/* its first field is NodeTag */
+	HashJoinTable hashtable;	/* hash table for the hashjoin */
+	List	   *hashkeys;		/* list of ExprState nodes */
+
+	/*
+	 * In a parallelized hash join, the leader retains a pointer to the
+	 * shared-memory stats area in its shared_info field, and then copies the
+	 * shared-memory info back to local storage before DSM shutdown.  The
+	 * shared_info field remains NULL in workers, or in non-parallel joins.
+	 */
+	SharedHashInfo *shared_info;
+
+	/*
+	 * If we are collecting hash stats, this points to an initially-zeroed
+	 * collection area, which could be either local storage or in shared
+	 * memory; either way it's for just one process.
+	 */
+	HashInstrumentation *hinstrument;
+
+	/* Parallel hash state. */
+	struct ParallelHashJoinState *parallel_state;
+} HashState;
+
+/* ----------------
+ *	 SetOpState information
+ *
+ *		Even in "sorted" mode, SetOp nodes are more complex than a simple
+ *		Unique, since we have to count how many duplicates to return.  But
+ *		we also support hashing, so this is really more like a cut-down
+ *		form of Agg.
+ * ----------------
+ */
+/* this struct is private in nodeSetOp.c: */
+typedef struct SetOpStatePerGroupData *SetOpStatePerGroup;
+
+typedef struct SetOpState
+{
+	PlanState	ps;				/* its first field is NodeTag */
+	ExprState  *eqfunction;		/* equality comparator */
+	Oid		   *eqfuncoids;		/* per-grouping-field equality fns */
+	FmgrInfo   *hashfunctions;	/* per-grouping-field hash fns */
+	bool		setop_done;		/* indicates completion of output scan */
+	long		numOutput;		/* number of dups left to output */
+	/* these fields are used in SETOP_SORTED mode: */
+	SetOpStatePerGroup pergroup;	/* per-group working state */
+	HeapTuple	grp_firstTuple; /* copy of first tuple of current group */
+	/* these fields are used in SETOP_HASHED mode: */
+	TupleHashTable hashtable;	/* hash table with one entry per group */
+	MemoryContext tableContext; /* memory context containing hash table */
+	bool		table_filled;	/* hash table filled yet? */
+	TupleHashIterator hashiter; /* for iterating through hash table */
+} SetOpState;
+
+/* ----------------
+ *	 LockRowsState information
+ *
+ *		LockRows nodes are used to enforce FOR [KEY] UPDATE/SHARE locking.
+ * ----------------
+ */
+typedef struct LockRowsState
+{
+	PlanState	ps;				/* its first field is NodeTag */
+	List	   *lr_arowMarks;	/* List of ExecAuxRowMarks */
+	EPQState	lr_epqstate;	/* for evaluating EvalPlanQual rechecks */
+} LockRowsState;
+
+/* ----------------
+ *	 LimitState information
+ *
+ *		Limit nodes are used to enforce LIMIT/OFFSET clauses.
+ *		They just select the desired subrange of their subplan's output.
+ *
+ * offset is the number of initial tuples to skip (0 does nothing).
+ * count is the number of tuples to return after skipping the offset tuples.
+ * If no limit count was specified, count is undefined and noCount is true.
+ * When lstate == LIMIT_INITIAL, offset/count/noCount haven't been set yet.
+ * ----------------
+ */
+typedef enum
+{
+	LIMIT_INITIAL,				/* initial state for LIMIT node */
+	LIMIT_RESCAN,				/* rescan after recomputing parameters */
+	LIMIT_EMPTY,				/* there are no returnable rows */
+	LIMIT_INWINDOW,				/* have returned a row in the window */
+	LIMIT_WINDOWEND_TIES,		/* have returned a tied row */
+	LIMIT_SUBPLANEOF,			/* at EOF of subplan (within window) */
+	LIMIT_WINDOWEND,			/* stepped off end of window */
+	LIMIT_WINDOWSTART			/* stepped off beginning of window */
+} LimitStateCond;
+
+typedef struct LimitState
+{
+	PlanState	ps;				/* its first field is NodeTag */
+	ExprState  *limitOffset;	/* OFFSET parameter, or NULL if none */
+	ExprState  *limitCount;		/* COUNT parameter, or NULL if none */
+	LimitOption limitOption;	/* limit specification type */
+	int64		offset;			/* current OFFSET value */
+	int64		count;			/* current COUNT, if any */
+	bool		noCount;		/* if true, ignore count */
+	LimitStateCond lstate;		/* state machine status, as above */
+	int64		position;		/* 1-based index of last tuple returned */
+	TupleTableSlot *subSlot;	/* tuple last obtained from subplan */
+	ExprState  *eqfunction;		/* tuple equality qual in case of WITH TIES
+								 * option */
+	TupleTableSlot *last_slot;	/* slot for evaluation of ties */
+} LimitState;
+
+#endif							/* EXECNODES_H */