Adding upstream version 13.4.upstream/13.4upstream

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

1 files changed, 1251 insertions, 0 deletions

diff --git a/src/include/nodes/plannodes.h b/src/include/nodes/plannodes.h
new file mode 100644
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@@ -0,0 +1,1251 @@
+/*-------------------------------------------------------------------------
+ *
+ * plannodes.h
+ *	  definitions for query plan nodes
+ *
+ *
+ * Portions Copyright (c) 1996-2020, PostgreSQL Global Development Group
+ * Portions Copyright (c) 1994, Regents of the University of California
+ *
+ * src/include/nodes/plannodes.h
+ *
+ *-------------------------------------------------------------------------
+ */
+#ifndef PLANNODES_H
+#define PLANNODES_H
+
+#include "access/sdir.h"
+#include "access/stratnum.h"
+#include "lib/stringinfo.h"
+#include "nodes/bitmapset.h"
+#include "nodes/lockoptions.h"
+#include "nodes/primnodes.h"
+
+
+/* ----------------------------------------------------------------
+ *						node definitions
+ * ----------------------------------------------------------------
+ */
+
+/* ----------------
+ *		PlannedStmt node
+ *
+ * The output of the planner is a Plan tree headed by a PlannedStmt node.
+ * PlannedStmt holds the "one time" information needed by the executor.
+ *
+ * For simplicity in APIs, we also wrap utility statements in PlannedStmt
+ * nodes; in such cases, commandType == CMD_UTILITY, the statement itself
+ * is in the utilityStmt field, and the rest of the struct is mostly dummy.
+ * (We do use canSetTag, stmt_location, stmt_len, and possibly queryId.)
+ * ----------------
+ */
+typedef struct PlannedStmt
+{
+	NodeTag		type;
+
+	CmdType		commandType;	/* select|insert|update|delete|utility */
+
+	uint64		queryId;		/* query identifier (copied from Query) */
+
+	bool		hasReturning;	/* is it insert|update|delete RETURNING? */
+
+	bool		hasModifyingCTE;	/* has insert|update|delete in WITH? */
+
+	bool		canSetTag;		/* do I set the command result tag? */
+
+	bool		transientPlan;	/* redo plan when TransactionXmin changes? */
+
+	bool		dependsOnRole;	/* is plan specific to current role? */
+
+	bool		parallelModeNeeded; /* parallel mode required to execute? */
+
+	int			jitFlags;		/* which forms of JIT should be performed */
+
+	struct Plan *planTree;		/* tree of Plan nodes */
+
+	List	   *rtable;			/* list of RangeTblEntry nodes */
+
+	/* rtable indexes of target relations for INSERT/UPDATE/DELETE */
+	List	   *resultRelations;	/* integer list of RT indexes, or NIL */
+
+	/*
+	 * rtable indexes of partitioned table roots that are UPDATE/DELETE
+	 * targets; needed for trigger firing.
+	 */
+	List	   *rootResultRelations;
+
+	List	   *appendRelations;	/* list of AppendRelInfo nodes */
+
+	List	   *subplans;		/* Plan trees for SubPlan expressions; note
+								 * that some could be NULL */
+
+	Bitmapset  *rewindPlanIDs;	/* indices of subplans that require REWIND */
+
+	List	   *rowMarks;		/* a list of PlanRowMark's */
+
+	List	   *relationOids;	/* OIDs of relations the plan depends on */
+
+	List	   *invalItems;		/* other dependencies, as PlanInvalItems */
+
+	List	   *paramExecTypes; /* type OIDs for PARAM_EXEC Params */
+
+	Node	   *utilityStmt;	/* non-null if this is utility stmt */
+
+	/* statement location in source string (copied from Query) */
+	int			stmt_location;	/* start location, or -1 if unknown */
+	int			stmt_len;		/* length in bytes; 0 means "rest of string" */
+} PlannedStmt;
+
+/* macro for fetching the Plan associated with a SubPlan node */
+#define exec_subplan_get_plan(plannedstmt, subplan) \
+	((Plan *) list_nth((plannedstmt)->subplans, (subplan)->plan_id - 1))
+
+
+/* ----------------
+ *		Plan node
+ *
+ * All plan nodes "derive" from the Plan structure by having the
+ * Plan structure as the first field.  This ensures that everything works
+ * when nodes are cast to Plan's.  (node pointers are frequently cast to Plan*
+ * when passed around generically in the executor)
+ *
+ * We never actually instantiate any Plan nodes; this is just the common
+ * abstract superclass for all Plan-type nodes.
+ * ----------------
+ */
+typedef struct Plan
+{
+	NodeTag		type;
+
+	/*
+	 * estimated execution costs for plan (see costsize.c for more info)
+	 */
+	Cost		startup_cost;	/* cost expended before fetching any tuples */
+	Cost		total_cost;		/* total cost (assuming all tuples fetched) */
+
+	/*
+	 * planner's estimate of result size of this plan step
+	 */
+	double		plan_rows;		/* number of rows plan is expected to emit */
+	int			plan_width;		/* average row width in bytes */
+
+	/*
+	 * information needed for parallel query
+	 */
+	bool		parallel_aware; /* engage parallel-aware logic? */
+	bool		parallel_safe;	/* OK to use as part of parallel plan? */
+
+	/*
+	 * Common structural data for all Plan types.
+	 */
+	int			plan_node_id;	/* unique across entire final plan tree */
+	List	   *targetlist;		/* target list to be computed at this node */
+	List	   *qual;			/* implicitly-ANDed qual conditions */
+	struct Plan *lefttree;		/* input plan tree(s) */
+	struct Plan *righttree;
+	List	   *initPlan;		/* Init Plan nodes (un-correlated expr
+								 * subselects) */
+
+	/*
+	 * Information for management of parameter-change-driven rescanning
+	 *
+	 * extParam includes the paramIDs of all external PARAM_EXEC params
+	 * affecting this plan node or its children.  setParam params from the
+	 * node's initPlans are not included, but their extParams are.
+	 *
+	 * allParam includes all the extParam paramIDs, plus the IDs of local
+	 * params that affect the node (i.e., the setParams of its initplans).
+	 * These are _all_ the PARAM_EXEC params that affect this node.
+	 */
+	Bitmapset  *extParam;
+	Bitmapset  *allParam;
+} Plan;
+
+/* ----------------
+ *	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 innerPlan(node)			(((Plan *)(node))->righttree)
+#define outerPlan(node)			(((Plan *)(node))->lefttree)
+
+
+/* ----------------
+ *	 Result node -
+ *		If no outer plan, evaluate a variable-free targetlist.
+ *		If outer plan, return tuples from outer plan (after a level of
+ *		projection as shown by targetlist).
+ *
+ * If resconstantqual isn't NULL, it represents a one-time qualification
+ * test (i.e., one that doesn't depend on any variables from the outer plan,
+ * so needs to be evaluated only once).
+ * ----------------
+ */
+typedef struct Result
+{
+	Plan		plan;
+	Node	   *resconstantqual;
+} Result;
+
+/* ----------------
+ *	 ProjectSet node -
+ *		Apply a projection that includes set-returning functions to the
+ *		output tuples of the outer plan.
+ * ----------------
+ */
+typedef struct ProjectSet
+{
+	Plan		plan;
+} ProjectSet;
+
+/* ----------------
+ *	 ModifyTable node -
+ *		Apply rows produced by subplan(s) to result table(s),
+ *		by inserting, updating, or deleting.
+ *
+ * If the originally named target table is a partitioned table, both
+ * nominalRelation and rootRelation contain the RT index of the partition
+ * root, which is not otherwise mentioned in the plan.  Otherwise rootRelation
+ * is zero.  However, nominalRelation will always be set, as it's the rel that
+ * EXPLAIN should claim is the INSERT/UPDATE/DELETE target.
+ *
+ * Note that rowMarks and epqParam are presumed to be valid for all the
+ * subplan(s); they can't contain any info that varies across subplans.
+ * ----------------
+ */
+typedef struct ModifyTable
+{
+	Plan		plan;
+	CmdType		operation;		/* INSERT, UPDATE, or DELETE */
+	bool		canSetTag;		/* do we set the command tag/es_processed? */
+	Index		nominalRelation;	/* Parent RT index for use of EXPLAIN */
+	Index		rootRelation;	/* Root RT index, if target is partitioned */
+	bool		partColsUpdated;	/* some part key in hierarchy updated */
+	List	   *resultRelations;	/* integer list of RT indexes */
+	int			resultRelIndex; /* index of first resultRel in plan's list */
+	int			rootResultRelIndex; /* index of the partitioned table root */
+	List	   *plans;			/* plan(s) producing source data */
+	List	   *withCheckOptionLists;	/* per-target-table WCO lists */
+	List	   *returningLists; /* per-target-table RETURNING tlists */
+	List	   *fdwPrivLists;	/* per-target-table FDW private data lists */
+	Bitmapset  *fdwDirectModifyPlans;	/* indices of FDW DM plans */
+	List	   *rowMarks;		/* PlanRowMarks (non-locking only) */
+	int			epqParam;		/* ID of Param for EvalPlanQual re-eval */
+	OnConflictAction onConflictAction;	/* ON CONFLICT action */
+	List	   *arbiterIndexes; /* List of ON CONFLICT arbiter index OIDs  */
+	List	   *onConflictSet;	/* SET for INSERT ON CONFLICT DO UPDATE */
+	Node	   *onConflictWhere;	/* WHERE for ON CONFLICT UPDATE */
+	Index		exclRelRTI;		/* RTI of the EXCLUDED pseudo relation */
+	List	   *exclRelTlist;	/* tlist of the EXCLUDED pseudo relation */
+} ModifyTable;
+
+struct PartitionPruneInfo;		/* forward reference to struct below */
+
+/* ----------------
+ *	 Append node -
+ *		Generate the concatenation of the results of sub-plans.
+ * ----------------
+ */
+typedef struct Append
+{
+	Plan		plan;
+	Bitmapset  *apprelids;		/* RTIs of appendrel(s) formed by this node */
+	List	   *appendplans;
+
+	/*
+	 * All 'appendplans' preceding this index are non-partial plans. All
+	 * 'appendplans' from this index onwards are partial plans.
+	 */
+	int			first_partial_plan;
+
+	/* Info for run-time subplan pruning; NULL if we're not doing that */
+	struct PartitionPruneInfo *part_prune_info;
+} Append;
+
+/* ----------------
+ *	 MergeAppend node -
+ *		Merge the results of pre-sorted sub-plans to preserve the ordering.
+ * ----------------
+ */
+typedef struct MergeAppend
+{
+	Plan		plan;
+	Bitmapset  *apprelids;		/* RTIs of appendrel(s) formed by this node */
+	List	   *mergeplans;
+	/* these fields are just like the sort-key info in struct Sort: */
+	int			numCols;		/* number of sort-key columns */
+	AttrNumber *sortColIdx;		/* their indexes in the target list */
+	Oid		   *sortOperators;	/* OIDs of operators to sort them by */
+	Oid		   *collations;		/* OIDs of collations */
+	bool	   *nullsFirst;		/* NULLS FIRST/LAST directions */
+	/* Info for run-time subplan pruning; NULL if we're not doing that */
+	struct PartitionPruneInfo *part_prune_info;
+} MergeAppend;
+
+/* ----------------
+ *	RecursiveUnion node -
+ *		Generate a recursive union of two subplans.
+ *
+ * The "outer" subplan is always the non-recursive term, and the "inner"
+ * subplan is the recursive term.
+ * ----------------
+ */
+typedef struct RecursiveUnion
+{
+	Plan		plan;
+	int			wtParam;		/* ID of Param representing work table */
+	/* Remaining fields are zero/null in UNION ALL case */
+	int			numCols;		/* number of columns to check for
+								 * duplicate-ness */
+	AttrNumber *dupColIdx;		/* their indexes in the target list */
+	Oid		   *dupOperators;	/* equality operators to compare with */
+	Oid		   *dupCollations;
+	long		numGroups;		/* estimated number of groups in input */
+} RecursiveUnion;
+
+/* ----------------
+ *	 BitmapAnd node -
+ *		Generate the intersection of the results of sub-plans.
+ *
+ * The subplans must be of types that yield tuple bitmaps.  The targetlist
+ * and qual fields of the plan are unused and are always NIL.
+ * ----------------
+ */
+typedef struct BitmapAnd
+{
+	Plan		plan;
+	List	   *bitmapplans;
+} BitmapAnd;
+
+/* ----------------
+ *	 BitmapOr node -
+ *		Generate the union of the results of sub-plans.
+ *
+ * The subplans must be of types that yield tuple bitmaps.  The targetlist
+ * and qual fields of the plan are unused and are always NIL.
+ * ----------------
+ */
+typedef struct BitmapOr
+{
+	Plan		plan;
+	bool		isshared;
+	List	   *bitmapplans;
+} BitmapOr;
+
+/*
+ * ==========
+ * Scan nodes
+ * ==========
+ */
+typedef struct Scan
+{
+	Plan		plan;
+	Index		scanrelid;		/* relid is index into the range table */
+} Scan;
+
+/* ----------------
+ *		sequential scan node
+ * ----------------
+ */
+typedef Scan SeqScan;
+
+/* ----------------
+ *		table sample scan node
+ * ----------------
+ */
+typedef struct SampleScan
+{
+	Scan		scan;
+	/* use struct pointer to avoid including parsenodes.h here */
+	struct TableSampleClause *tablesample;
+} SampleScan;
+
+/* ----------------
+ *		index scan node
+ *
+ * indexqualorig is an implicitly-ANDed list of index qual expressions, each
+ * in the same form it appeared in the query WHERE condition.  Each should
+ * be of the form (indexkey OP comparisonval) or (comparisonval OP indexkey).
+ * The indexkey is a Var or expression referencing column(s) of the index's
+ * base table.  The comparisonval might be any expression, but it won't use
+ * any columns of the base table.  The expressions are ordered by index
+ * column position (but items referencing the same index column can appear
+ * in any order).  indexqualorig is used at runtime only if we have to recheck
+ * a lossy indexqual.
+ *
+ * indexqual has the same form, but the expressions have been commuted if
+ * necessary to put the indexkeys on the left, and the indexkeys are replaced
+ * by Var nodes identifying the index columns (their varno is INDEX_VAR and
+ * their varattno is the index column number).
+ *
+ * indexorderbyorig is similarly the original form of any ORDER BY expressions
+ * that are being implemented by the index, while indexorderby is modified to
+ * have index column Vars on the left-hand side.  Here, multiple expressions
+ * must appear in exactly the ORDER BY order, and this is not necessarily the
+ * index column order.  Only the expressions are provided, not the auxiliary
+ * sort-order information from the ORDER BY SortGroupClauses; it's assumed
+ * that the sort ordering is fully determinable from the top-level operators.
+ * indexorderbyorig is used at runtime to recheck the ordering, if the index
+ * cannot calculate an accurate ordering.  It is also needed for EXPLAIN.
+ *
+ * indexorderbyops is a list of the OIDs of the operators used to sort the
+ * ORDER BY expressions.  This is used together with indexorderbyorig to
+ * recheck ordering at run time.  (Note that indexorderby, indexorderbyorig,
+ * and indexorderbyops are used for amcanorderbyop cases, not amcanorder.)
+ *
+ * indexorderdir specifies the scan ordering, for indexscans on amcanorder
+ * indexes (for other indexes it should be "don't care").
+ * ----------------
+ */
+typedef struct IndexScan
+{
+	Scan		scan;
+	Oid			indexid;		/* OID of index to scan */
+	List	   *indexqual;		/* list of index quals (usually OpExprs) */
+	List	   *indexqualorig;	/* the same in original form */
+	List	   *indexorderby;	/* list of index ORDER BY exprs */
+	List	   *indexorderbyorig;	/* the same in original form */
+	List	   *indexorderbyops;	/* OIDs of sort ops for ORDER BY exprs */
+	ScanDirection indexorderdir;	/* forward or backward or don't care */
+} IndexScan;
+
+/* ----------------
+ *		index-only scan node
+ *
+ * IndexOnlyScan is very similar to IndexScan, but it specifies an
+ * index-only scan, in which the data comes from the index not the heap.
+ * Because of this, *all* Vars in the plan node's targetlist, qual, and
+ * index expressions reference index columns and have varno = INDEX_VAR.
+ * Hence we do not need separate indexqualorig and indexorderbyorig lists,
+ * since their contents would be equivalent to indexqual and indexorderby.
+ *
+ * To help EXPLAIN interpret the index Vars for display, we provide
+ * indextlist, which represents the contents of the index as a targetlist
+ * with one TLE per index column.  Vars appearing in this list reference
+ * the base table, and this is the only field in the plan node that may
+ * contain such Vars.
+ * ----------------
+ */
+typedef struct IndexOnlyScan
+{
+	Scan		scan;
+	Oid			indexid;		/* OID of index to scan */
+	List	   *indexqual;		/* list of index quals (usually OpExprs) */
+	List	   *indexorderby;	/* list of index ORDER BY exprs */
+	List	   *indextlist;		/* TargetEntry list describing index's cols */
+	ScanDirection indexorderdir;	/* forward or backward or don't care */
+} IndexOnlyScan;
+
+/* ----------------
+ *		bitmap index scan node
+ *
+ * BitmapIndexScan delivers a bitmap of potential tuple locations;
+ * it does not access the heap itself.  The bitmap is used by an
+ * ancestor BitmapHeapScan node, possibly after passing through
+ * intermediate BitmapAnd and/or BitmapOr nodes to combine it with
+ * the results of other BitmapIndexScans.
+ *
+ * The fields have the same meanings as for IndexScan, except we don't
+ * store a direction flag because direction is uninteresting.
+ *
+ * In a BitmapIndexScan plan node, the targetlist and qual fields are
+ * not used and are always NIL.  The indexqualorig field is unused at
+ * run time too, but is saved for the benefit of EXPLAIN.
+ * ----------------
+ */
+typedef struct BitmapIndexScan
+{
+	Scan		scan;
+	Oid			indexid;		/* OID of index to scan */
+	bool		isshared;		/* Create shared bitmap if set */
+	List	   *indexqual;		/* list of index quals (OpExprs) */
+	List	   *indexqualorig;	/* the same in original form */
+} BitmapIndexScan;
+
+/* ----------------
+ *		bitmap sequential scan node
+ *
+ * This needs a copy of the qual conditions being used by the input index
+ * scans because there are various cases where we need to recheck the quals;
+ * for example, when the bitmap is lossy about the specific rows on a page
+ * that meet the index condition.
+ * ----------------
+ */
+typedef struct BitmapHeapScan
+{
+	Scan		scan;
+	List	   *bitmapqualorig; /* index quals, in standard expr form */
+} BitmapHeapScan;
+
+/* ----------------
+ *		tid scan node
+ *
+ * tidquals is an implicitly OR'ed list of qual expressions of the form
+ * "CTID = pseudoconstant", or "CTID = ANY(pseudoconstant_array)",
+ * or a CurrentOfExpr for the relation.
+ * ----------------
+ */
+typedef struct TidScan
+{
+	Scan		scan;
+	List	   *tidquals;		/* qual(s) involving CTID = something */
+} TidScan;
+
+/* ----------------
+ *		subquery scan node
+ *
+ * SubqueryScan is for scanning the output of a sub-query in the range table.
+ * We often need an extra plan node above the sub-query's plan to perform
+ * expression evaluations (which we can't push into the sub-query without
+ * risking changing its semantics).  Although we are not scanning a physical
+ * relation, we make this a descendant of Scan anyway for code-sharing
+ * purposes.
+ *
+ * Note: we store the sub-plan in the type-specific subplan field, not in
+ * the generic lefttree field as you might expect.  This is because we do
+ * not want plan-tree-traversal routines to recurse into the subplan without
+ * knowing that they are changing Query contexts.
+ * ----------------
+ */
+typedef struct SubqueryScan
+{
+	Scan		scan;
+	Plan	   *subplan;
+} SubqueryScan;
+
+/* ----------------
+ *		FunctionScan node
+ * ----------------
+ */
+typedef struct FunctionScan
+{
+	Scan		scan;
+	List	   *functions;		/* list of RangeTblFunction nodes */
+	bool		funcordinality; /* WITH ORDINALITY */
+} FunctionScan;
+
+/* ----------------
+ *		ValuesScan node
+ * ----------------
+ */
+typedef struct ValuesScan
+{
+	Scan		scan;
+	List	   *values_lists;	/* list of expression lists */
+} ValuesScan;
+
+/* ----------------
+ *		TableFunc scan node
+ * ----------------
+ */
+typedef struct TableFuncScan
+{
+	Scan		scan;
+	TableFunc  *tablefunc;		/* table function node */
+} TableFuncScan;
+
+/* ----------------
+ *		CteScan node
+ * ----------------
+ */
+typedef struct CteScan
+{
+	Scan		scan;
+	int			ctePlanId;		/* ID of init SubPlan for CTE */
+	int			cteParam;		/* ID of Param representing CTE output */
+} CteScan;
+
+/* ----------------
+ *		NamedTuplestoreScan node
+ * ----------------
+ */
+typedef struct NamedTuplestoreScan
+{
+	Scan		scan;
+	char	   *enrname;		/* Name given to Ephemeral Named Relation */
+} NamedTuplestoreScan;
+
+/* ----------------
+ *		WorkTableScan node
+ * ----------------
+ */
+typedef struct WorkTableScan
+{
+	Scan		scan;
+	int			wtParam;		/* ID of Param representing work table */
+} WorkTableScan;
+
+/* ----------------
+ *		ForeignScan node
+ *
+ * fdw_exprs and fdw_private are both under the control of the foreign-data
+ * wrapper, but fdw_exprs is presumed to contain expression trees and will
+ * be post-processed accordingly by the planner; fdw_private won't be.
+ * Note that everything in both lists must be copiable by copyObject().
+ * One way to store an arbitrary blob of bytes is to represent it as a bytea
+ * Const.  Usually, though, you'll be better off choosing a representation
+ * that can be dumped usefully by nodeToString().
+ *
+ * fdw_scan_tlist is a targetlist describing the contents of the scan tuple
+ * returned by the FDW; it can be NIL if the scan tuple matches the declared
+ * rowtype of the foreign table, which is the normal case for a simple foreign
+ * table scan.  (If the plan node represents a foreign join, fdw_scan_tlist
+ * is required since there is no rowtype available from the system catalogs.)
+ * When fdw_scan_tlist is provided, Vars in the node's tlist and quals must
+ * have varno INDEX_VAR, and their varattnos correspond to resnos in the
+ * fdw_scan_tlist (which are also column numbers in the actual scan tuple).
+ * fdw_scan_tlist is never actually executed; it just holds expression trees
+ * describing what is in the scan tuple's columns.
+ *
+ * fdw_recheck_quals should contain any quals which the core system passed to
+ * the FDW but which were not added to scan.plan.qual; that is, it should
+ * contain the quals being checked remotely.  This is needed for correct
+ * behavior during EvalPlanQual rechecks.
+ *
+ * When the plan node represents a foreign join, scan.scanrelid is zero and
+ * fs_relids must be consulted to identify the join relation.  (fs_relids
+ * is valid for simple scans as well, but will always match scan.scanrelid.)
+ * ----------------
+ */
+typedef struct ForeignScan
+{
+	Scan		scan;
+	CmdType		operation;		/* SELECT/INSERT/UPDATE/DELETE */
+	Oid			fs_server;		/* OID of foreign server */
+	List	   *fdw_exprs;		/* expressions that FDW may evaluate */
+	List	   *fdw_private;	/* private data for FDW */
+	List	   *fdw_scan_tlist; /* optional tlist describing scan tuple */
+	List	   *fdw_recheck_quals;	/* original quals not in scan.plan.qual */
+	Bitmapset  *fs_relids;		/* RTIs generated by this scan */
+	bool		fsSystemCol;	/* true if any "system column" is needed */
+} ForeignScan;
+
+/* ----------------
+ *	   CustomScan node
+ *
+ * The comments for ForeignScan's fdw_exprs, fdw_private, fdw_scan_tlist,
+ * and fs_relids fields apply equally to CustomScan's custom_exprs,
+ * custom_private, custom_scan_tlist, and custom_relids fields.  The
+ * convention of setting scan.scanrelid to zero for joins applies as well.
+ *
+ * Note that since Plan trees can be copied, custom scan providers *must*
+ * fit all plan data they need into those fields; embedding CustomScan in
+ * a larger struct will not work.
+ * ----------------
+ */
+struct CustomScanMethods;
+
+typedef struct CustomScan
+{
+	Scan		scan;
+	uint32		flags;			/* mask of CUSTOMPATH_* flags, see
+								 * nodes/extensible.h */
+	List	   *custom_plans;	/* list of Plan nodes, if any */
+	List	   *custom_exprs;	/* expressions that custom code may evaluate */
+	List	   *custom_private; /* private data for custom code */
+	List	   *custom_scan_tlist;	/* optional tlist describing scan tuple */
+	Bitmapset  *custom_relids;	/* RTIs generated by this scan */
+	const struct CustomScanMethods *methods;
+} CustomScan;
+
+/*
+ * ==========
+ * Join nodes
+ * ==========
+ */
+
+/* ----------------
+ *		Join node
+ *
+ * jointype:	rule for joining tuples from left and right subtrees
+ * inner_unique each outer tuple can match to no more than one inner tuple
+ * joinqual:	qual conditions that came from JOIN/ON or JOIN/USING
+ *				(plan.qual contains conditions that came from WHERE)
+ *
+ * When jointype is INNER, joinqual and plan.qual are semantically
+ * interchangeable.  For OUTER jointypes, the two are *not* interchangeable;
+ * only joinqual is used to determine whether a match has been found for
+ * the purpose of deciding whether to generate null-extended tuples.
+ * (But plan.qual is still applied before actually returning a tuple.)
+ * For an outer join, only joinquals are allowed to be used as the merge
+ * or hash condition of a merge or hash join.
+ *
+ * inner_unique is set if the joinquals are such that no more than one inner
+ * tuple could match any given outer tuple.  This allows the executor to
+ * skip searching for additional matches.  (This must be provable from just
+ * the joinquals, ignoring plan.qual, due to where the executor tests it.)
+ * ----------------
+ */
+typedef struct Join
+{
+	Plan		plan;
+	JoinType	jointype;
+	bool		inner_unique;
+	List	   *joinqual;		/* JOIN quals (in addition to plan.qual) */
+} Join;
+
+/* ----------------
+ *		nest loop join node
+ *
+ * The nestParams list identifies any executor Params that must be passed
+ * into execution of the inner subplan carrying values from the current row
+ * of the outer subplan.  Currently we restrict these values to be simple
+ * Vars, but perhaps someday that'd be worth relaxing.  (Note: during plan
+ * creation, the paramval can actually be a PlaceHolderVar expression; but it
+ * must be a Var with varno OUTER_VAR by the time it gets to the executor.)
+ * ----------------
+ */
+typedef struct NestLoop
+{
+	Join		join;
+	List	   *nestParams;		/* list of NestLoopParam nodes */
+} NestLoop;
+
+typedef struct NestLoopParam
+{
+	NodeTag		type;
+	int			paramno;		/* number of the PARAM_EXEC Param to set */
+	Var		   *paramval;		/* outer-relation Var to assign to Param */
+} NestLoopParam;
+
+/* ----------------
+ *		merge join node
+ *
+ * The expected ordering of each mergeable column is described by a btree
+ * opfamily OID, a collation OID, a direction (BTLessStrategyNumber or
+ * BTGreaterStrategyNumber) and a nulls-first flag.  Note that the two sides
+ * of each mergeclause may be of different datatypes, but they are ordered the
+ * same way according to the common opfamily and collation.  The operator in
+ * each mergeclause must be an equality operator of the indicated opfamily.
+ * ----------------
+ */
+typedef struct MergeJoin
+{
+	Join		join;
+	bool		skip_mark_restore;	/* Can we skip mark/restore calls? */
+	List	   *mergeclauses;	/* mergeclauses as expression trees */
+	/* these are arrays, but have the same length as the mergeclauses list: */
+	Oid		   *mergeFamilies;	/* per-clause OIDs of btree opfamilies */
+	Oid		   *mergeCollations;	/* per-clause OIDs of collations */
+	int		   *mergeStrategies;	/* per-clause ordering (ASC or DESC) */
+	bool	   *mergeNullsFirst;	/* per-clause nulls ordering */
+} MergeJoin;
+
+/* ----------------
+ *		hash join node
+ * ----------------
+ */
+typedef struct HashJoin
+{
+	Join		join;
+	List	   *hashclauses;
+	List	   *hashoperators;
+	List	   *hashcollations;
+
+	/*
+	 * List of expressions to be hashed for tuples from the outer plan, to
+	 * perform lookups in the hashtable over the inner plan.
+	 */
+	List	   *hashkeys;
+} HashJoin;
+
+/* ----------------
+ *		materialization node
+ * ----------------
+ */
+typedef struct Material
+{
+	Plan		plan;
+} Material;
+
+/* ----------------
+ *		sort node
+ * ----------------
+ */
+typedef struct Sort
+{
+	Plan		plan;
+	int			numCols;		/* number of sort-key columns */
+	AttrNumber *sortColIdx;		/* their indexes in the target list */
+	Oid		   *sortOperators;	/* OIDs of operators to sort them by */
+	Oid		   *collations;		/* OIDs of collations */
+	bool	   *nullsFirst;		/* NULLS FIRST/LAST directions */
+} Sort;
+
+/* ----------------
+ *		incremental sort node
+ * ----------------
+ */
+typedef struct IncrementalSort
+{
+	Sort		sort;
+	int			nPresortedCols; /* number of presorted columns */
+} IncrementalSort;
+
+/* ---------------
+ *	 group node -
+ *		Used for queries with GROUP BY (but no aggregates) specified.
+ *		The input must be presorted according to the grouping columns.
+ * ---------------
+ */
+typedef struct Group
+{
+	Plan		plan;
+	int			numCols;		/* number of grouping columns */
+	AttrNumber *grpColIdx;		/* their indexes in the target list */
+	Oid		   *grpOperators;	/* equality operators to compare with */
+	Oid		   *grpCollations;
+} Group;
+
+/* ---------------
+ *		aggregate node
+ *
+ * An Agg node implements plain or grouped aggregation.  For grouped
+ * aggregation, we can work with presorted input or unsorted input;
+ * the latter strategy uses an internal hashtable.
+ *
+ * Notice the lack of any direct info about the aggregate functions to be
+ * computed.  They are found by scanning the node's tlist and quals during
+ * executor startup.  (It is possible that there are no aggregate functions;
+ * this could happen if they get optimized away by constant-folding, or if
+ * we are using the Agg node to implement hash-based grouping.)
+ * ---------------
+ */
+typedef struct Agg
+{
+	Plan		plan;
+	AggStrategy aggstrategy;	/* basic strategy, see nodes.h */
+	AggSplit	aggsplit;		/* agg-splitting mode, see nodes.h */
+	int			numCols;		/* number of grouping columns */
+	AttrNumber *grpColIdx;		/* their indexes in the target list */
+	Oid		   *grpOperators;	/* equality operators to compare with */
+	Oid		   *grpCollations;
+	long		numGroups;		/* estimated number of groups in input */
+	uint64		transitionSpace;	/* for pass-by-ref transition data */
+	Bitmapset  *aggParams;		/* IDs of Params used in Aggref inputs */
+	/* Note: planner provides numGroups & aggParams only in HASHED/MIXED case */
+	List	   *groupingSets;	/* grouping sets to use */
+	List	   *chain;			/* chained Agg/Sort nodes */
+} Agg;
+
+/* ----------------
+ *		window aggregate node
+ * ----------------
+ */
+typedef struct WindowAgg
+{
+	Plan		plan;
+	Index		winref;			/* ID referenced by window functions */
+	int			partNumCols;	/* number of columns in partition clause */
+	AttrNumber *partColIdx;		/* their indexes in the target list */
+	Oid		   *partOperators;	/* equality operators for partition columns */
+	Oid		   *partCollations; /* collations for partition columns */
+	int			ordNumCols;		/* number of columns in ordering clause */
+	AttrNumber *ordColIdx;		/* their indexes in the target list */
+	Oid		   *ordOperators;	/* equality operators for ordering columns */
+	Oid		   *ordCollations;	/* collations for ordering columns */
+	int			frameOptions;	/* frame_clause options, see WindowDef */
+	Node	   *startOffset;	/* expression for starting bound, if any */
+	Node	   *endOffset;		/* expression for ending bound, if any */
+	/* these fields are used with RANGE offset PRECEDING/FOLLOWING: */
+	Oid			startInRangeFunc;	/* in_range function for startOffset */
+	Oid			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? */
+} WindowAgg;
+
+/* ----------------
+ *		unique node
+ * ----------------
+ */
+typedef struct Unique
+{
+	Plan		plan;
+	int			numCols;		/* number of columns to check for uniqueness */
+	AttrNumber *uniqColIdx;		/* their indexes in the target list */
+	Oid		   *uniqOperators;	/* equality operators to compare with */
+	Oid		   *uniqCollations; /* collations for equality comparisons */
+} Unique;
+
+/* ------------
+ *		gather node
+ *
+ * Note: rescan_param is the ID of a PARAM_EXEC parameter slot.  That slot
+ * will never actually contain a value, but the Gather node must flag it as
+ * having changed whenever it is rescanned.  The child parallel-aware scan
+ * nodes are marked as depending on that parameter, so that the rescan
+ * machinery is aware that their output is likely to change across rescans.
+ * In some cases we don't need a rescan Param, so rescan_param is set to -1.
+ * ------------
+ */
+typedef struct Gather
+{
+	Plan		plan;
+	int			num_workers;	/* planned number of worker processes */
+	int			rescan_param;	/* ID of Param that signals a rescan, or -1 */
+	bool		single_copy;	/* don't execute plan more than once */
+	bool		invisible;		/* suppress EXPLAIN display (for testing)? */
+	Bitmapset  *initParam;		/* param id's of initplans which are referred
+								 * at gather or one of it's child node */
+} Gather;
+
+/* ------------
+ *		gather merge node
+ * ------------
+ */
+typedef struct GatherMerge
+{
+	Plan		plan;
+	int			num_workers;	/* planned number of worker processes */
+	int			rescan_param;	/* ID of Param that signals a rescan, or -1 */
+	/* remaining fields are just like the sort-key info in struct Sort */
+	int			numCols;		/* number of sort-key columns */
+	AttrNumber *sortColIdx;		/* their indexes in the target list */
+	Oid		   *sortOperators;	/* OIDs of operators to sort them by */
+	Oid		   *collations;		/* OIDs of collations */
+	bool	   *nullsFirst;		/* NULLS FIRST/LAST directions */
+	Bitmapset  *initParam;		/* param id's of initplans which are referred
+								 * at gather merge or one of it's child node */
+} GatherMerge;
+
+/* ----------------
+ *		hash build node
+ *
+ * If the executor is supposed to try to apply skew join optimization, then
+ * skewTable/skewColumn/skewInherit identify the outer relation's join key
+ * column, from which the relevant MCV statistics can be fetched.
+ * ----------------
+ */
+typedef struct Hash
+{
+	Plan		plan;
+
+	/*
+	 * List of expressions to be hashed for tuples from Hash's outer plan,
+	 * needed to put them into the hashtable.
+	 */
+	List	   *hashkeys;		/* hash keys for the hashjoin condition */
+	Oid			skewTable;		/* outer join key's table OID, or InvalidOid */
+	AttrNumber	skewColumn;		/* outer join key's column #, or zero */
+	bool		skewInherit;	/* is outer join rel an inheritance tree? */
+	/* all other info is in the parent HashJoin node */
+	double		rows_total;		/* estimate total rows if parallel_aware */
+} Hash;
+
+/* ----------------
+ *		setop node
+ * ----------------
+ */
+typedef struct SetOp
+{
+	Plan		plan;
+	SetOpCmd	cmd;			/* what to do, see nodes.h */
+	SetOpStrategy strategy;		/* how to do it, see nodes.h */
+	int			numCols;		/* number of columns to check for
+								 * duplicate-ness */
+	AttrNumber *dupColIdx;		/* their indexes in the target list */
+	Oid		   *dupOperators;	/* equality operators to compare with */
+	Oid		   *dupCollations;
+	AttrNumber	flagColIdx;		/* where is the flag column, if any */
+	int			firstFlag;		/* flag value for first input relation */
+	long		numGroups;		/* estimated number of groups in input */
+} SetOp;
+
+/* ----------------
+ *		lock-rows node
+ *
+ * rowMarks identifies the rels to be locked by this node; it should be
+ * a subset of the rowMarks listed in the top-level PlannedStmt.
+ * epqParam is a Param that all scan nodes below this one must depend on.
+ * It is used to force re-evaluation of the plan during EvalPlanQual.
+ * ----------------
+ */
+typedef struct LockRows
+{
+	Plan		plan;
+	List	   *rowMarks;		/* a list of PlanRowMark's */
+	int			epqParam;		/* ID of Param for EvalPlanQual re-eval */
+} LockRows;
+
+/* ----------------
+ *		limit node
+ *
+ * Note: as of Postgres 8.2, the offset and count expressions are expected
+ * to yield int8, rather than int4 as before.
+ * ----------------
+ */
+typedef struct Limit
+{
+	Plan		plan;
+	Node	   *limitOffset;	/* OFFSET parameter, or NULL if none */
+	Node	   *limitCount;		/* COUNT parameter, or NULL if none */
+	LimitOption limitOption;	/* limit type */
+	int			uniqNumCols;	/* number of columns to check for similarity  */
+	AttrNumber *uniqColIdx;		/* their indexes in the target list */
+	Oid		   *uniqOperators;	/* equality operators to compare with */
+	Oid		   *uniqCollations; /* collations for equality comparisons */
+} Limit;
+
+
+/*
+ * RowMarkType -
+ *	  enums for types of row-marking operations
+ *
+ * The first four of these values represent different lock strengths that
+ * we can take on tuples according to SELECT FOR [KEY] UPDATE/SHARE requests.
+ * We support these on regular tables, as well as on foreign tables whose FDWs
+ * report support for late locking.  For other foreign tables, any locking
+ * that might be done for such requests must happen during the initial row
+ * fetch; their FDWs provide no mechanism for going back to lock a row later.
+ * This means that the semantics will be a bit different than for a local
+ * table; in particular we are likely to lock more rows than would be locked
+ * locally, since remote rows will be locked even if they then fail
+ * locally-checked restriction or join quals.  However, the prospect of
+ * doing a separate remote query to lock each selected row is usually pretty
+ * unappealing, so early locking remains a credible design choice for FDWs.
+ *
+ * When doing UPDATE, DELETE, or SELECT FOR UPDATE/SHARE, we have to uniquely
+ * identify all the source rows, not only those from the target relations, so
+ * that we can perform EvalPlanQual rechecking at need.  For plain tables we
+ * can just fetch the TID, much as for a target relation; this case is
+ * represented by ROW_MARK_REFERENCE.  Otherwise (for example for VALUES or
+ * FUNCTION scans) we have to copy the whole row value.  ROW_MARK_COPY is
+ * pretty inefficient, since most of the time we'll never need the data; but
+ * fortunately the overhead is usually not performance-critical in practice.
+ * By default we use ROW_MARK_COPY for foreign tables, but if the FDW has
+ * a concept of rowid it can request to use ROW_MARK_REFERENCE instead.
+ * (Again, this probably doesn't make sense if a physical remote fetch is
+ * needed, but for FDWs that map to local storage it might be credible.)
+ */
+typedef enum RowMarkType
+{
+	ROW_MARK_EXCLUSIVE,			/* obtain exclusive tuple lock */
+	ROW_MARK_NOKEYEXCLUSIVE,	/* obtain no-key exclusive tuple lock */
+	ROW_MARK_SHARE,				/* obtain shared tuple lock */
+	ROW_MARK_KEYSHARE,			/* obtain keyshare tuple lock */
+	ROW_MARK_REFERENCE,			/* just fetch the TID, don't lock it */
+	ROW_MARK_COPY				/* physically copy the row value */
+} RowMarkType;
+
+#define RowMarkRequiresRowShareLock(marktype)  ((marktype) <= ROW_MARK_KEYSHARE)
+
+/*
+ * PlanRowMark -
+ *	   plan-time representation of FOR [KEY] UPDATE/SHARE clauses
+ *
+ * When doing UPDATE, DELETE, or SELECT FOR UPDATE/SHARE, we create a separate
+ * PlanRowMark node for each non-target relation in the query.  Relations that
+ * are not specified as FOR UPDATE/SHARE are marked ROW_MARK_REFERENCE (if
+ * regular tables or supported foreign tables) or ROW_MARK_COPY (if not).
+ *
+ * Initially all PlanRowMarks have rti == prti and isParent == false.
+ * When the planner discovers that a relation is the root of an inheritance
+ * tree, it sets isParent true, and adds an additional PlanRowMark to the
+ * list for each child relation (including the target rel itself in its role
+ * as a child).  isParent is also set to true for the partitioned child
+ * relations, which are not scanned just like the root parent.  The child
+ * entries have rti == child rel's RT index and prti == parent's RT index,
+ * and can therefore be recognized as children by the fact that prti != rti.
+ * The parent's allMarkTypes field gets the OR of (1<<markType) across all
+ * its children (this definition allows children to use different markTypes).
+ *
+ * The planner also adds resjunk output columns to the plan that carry
+ * information sufficient to identify the locked or fetched rows.  When
+ * markType != ROW_MARK_COPY, these columns are named
+ *		tableoid%u			OID of table
+ *		ctid%u				TID of row
+ * The tableoid column is only present for an inheritance hierarchy.
+ * When markType == ROW_MARK_COPY, there is instead a single column named
+ *		wholerow%u			whole-row value of relation
+ * (An inheritance hierarchy could have all three resjunk output columns,
+ * if some children use a different markType than others.)
+ * In all three cases, %u represents the rowmark ID number (rowmarkId).
+ * This number is unique within a plan tree, except that child relation
+ * entries copy their parent's rowmarkId.  (Assigning unique numbers
+ * means we needn't renumber rowmarkIds when flattening subqueries, which
+ * would require finding and renaming the resjunk columns as well.)
+ * Note this means that all tables in an inheritance hierarchy share the
+ * same resjunk column names.  However, in an inherited UPDATE/DELETE the
+ * columns could have different physical column numbers in each subplan.
+ */
+typedef struct PlanRowMark
+{
+	NodeTag		type;
+	Index		rti;			/* range table index of markable relation */
+	Index		prti;			/* range table index of parent relation */
+	Index		rowmarkId;		/* unique identifier for resjunk columns */
+	RowMarkType markType;		/* see enum above */
+	int			allMarkTypes;	/* OR of (1<<markType) for all children */
+	LockClauseStrength strength;	/* LockingClause's strength, or LCS_NONE */
+	LockWaitPolicy waitPolicy;	/* NOWAIT and SKIP LOCKED options */
+	bool		isParent;		/* true if this is a "dummy" parent entry */
+} PlanRowMark;
+
+
+/*
+ * Node types to represent partition pruning information.
+ */
+
+/*
+ * PartitionPruneInfo - Details required to allow the executor to prune
+ * partitions.
+ *
+ * Here we store mapping details to allow translation of a partitioned table's
+ * index as returned by the partition pruning code into subplan indexes for
+ * plan types which support arbitrary numbers of subplans, such as Append.
+ * We also store various details to tell the executor when it should be
+ * performing partition pruning.
+ *
+ * Each PartitionedRelPruneInfo describes the partitioning rules for a single
+ * partitioned table (a/k/a level of partitioning).  Since a partitioning
+ * hierarchy could contain multiple levels, we represent it by a List of
+ * PartitionedRelPruneInfos, where the first entry represents the topmost
+ * partitioned table and additional entries represent non-leaf child
+ * partitions, ordered such that parents appear before their children.
+ * Then, since an Append-type node could have multiple partitioning
+ * hierarchies among its children, we have an unordered List of those Lists.
+ *
+ * prune_infos			List of Lists containing PartitionedRelPruneInfo nodes,
+ *						one sublist per run-time-prunable partition hierarchy
+ *						appearing in the parent plan node's subplans.
+ * other_subplans		Indexes of any subplans that are not accounted for
+ *						by any of the PartitionedRelPruneInfo nodes in
+ *						"prune_infos".  These subplans must not be pruned.
+ */
+typedef struct PartitionPruneInfo
+{
+	NodeTag		type;
+	List	   *prune_infos;
+	Bitmapset  *other_subplans;
+} PartitionPruneInfo;
+
+/*
+ * PartitionedRelPruneInfo - Details required to allow the executor to prune
+ * partitions for a single partitioned table.
+ *
+ * subplan_map[] and subpart_map[] are indexed by partition index of the
+ * partitioned table referenced by 'rtindex', the partition index being the
+ * order that the partitions are defined in the table's PartitionDesc.  For a
+ * leaf partition p, subplan_map[p] contains the zero-based index of the
+ * partition's subplan in the parent plan's subplan list; it is -1 if the
+ * partition is non-leaf or has been pruned.  For a non-leaf partition p,
+ * subpart_map[p] contains the zero-based index of that sub-partition's
+ * PartitionedRelPruneInfo in the hierarchy's PartitionedRelPruneInfo list;
+ * it is -1 if the partition is a leaf or has been pruned.  Note that subplan
+ * indexes, as stored in 'subplan_map', are global across the parent plan
+ * node, but partition indexes are valid only within a particular hierarchy.
+ * relid_map[p] contains the partition's OID, or 0 if the partition was pruned.
+ */
+typedef struct PartitionedRelPruneInfo
+{
+	NodeTag		type;
+	Index		rtindex;		/* RT index of partition rel for this level */
+	Bitmapset  *present_parts;	/* Indexes of all partitions which subplans or
+								 * subparts are present for */
+	int			nparts;			/* Length of the following arrays: */
+	int		   *subplan_map;	/* subplan index by partition index, or -1 */
+	int		   *subpart_map;	/* subpart index by partition index, or -1 */
+	Oid		   *relid_map;		/* relation OID by partition index, or 0 */
+
+	/*
+	 * initial_pruning_steps shows how to prune during executor startup (i.e.,
+	 * without use of any PARAM_EXEC Params); it is NIL if no startup pruning
+	 * is required.  exec_pruning_steps shows how to prune with PARAM_EXEC
+	 * Params; it is NIL if no per-scan pruning is required.
+	 */
+	List	   *initial_pruning_steps;	/* List of PartitionPruneStep */
+	List	   *exec_pruning_steps; /* List of PartitionPruneStep */
+	Bitmapset  *execparamids;	/* All PARAM_EXEC Param IDs in
+								 * exec_pruning_steps */
+} PartitionedRelPruneInfo;
+
+/*
+ * Abstract Node type for partition pruning steps (there are no concrete
+ * Nodes of this type).
+ *
+ * step_id is the global identifier of the step within its pruning context.
+ */
+typedef struct PartitionPruneStep
+{
+	NodeTag		type;
+	int			step_id;
+} PartitionPruneStep;
+
+/*
+ * PartitionPruneStepOp - Information to prune using a set of mutually AND'd
+ *							OpExpr clauses
+ *
+ * This contains information extracted from up to partnatts OpExpr clauses,
+ * where partnatts is the number of partition key columns.  'opstrategy' is the
+ * strategy of the operator in the clause matched to the last partition key.
+ * 'exprs' contains expressions which comprise the lookup key to be passed to
+ * the partition bound search function.  'cmpfns' contains the OIDs of
+ * comparison functions used to compare aforementioned expressions with
+ * partition bounds.  Both 'exprs' and 'cmpfns' contain the same number of
+ * items, up to partnatts items.
+ *
+ * Once we find the offset of a partition bound using the lookup key, we
+ * determine which partitions to include in the result based on the value of
+ * 'opstrategy'.  For example, if it were equality, we'd return just the
+ * partition that would contain that key or a set of partitions if the key
+ * didn't consist of all partitioning columns.  For non-equality strategies,
+ * we'd need to include other partitions as appropriate.
+ *
+ * 'nullkeys' is the set containing the offset of the partition keys (0 to
+ * partnatts - 1) that were matched to an IS NULL clause.  This is only
+ * considered for hash partitioning as we need to pass which keys are null
+ * to the hash partition bound search function.  It is never possible to
+ * have an expression be present in 'exprs' for a given partition key and
+ * the corresponding bit set in 'nullkeys'.
+ */
+typedef struct PartitionPruneStepOp
+{
+	PartitionPruneStep step;
+
+	StrategyNumber opstrategy;
+	List	   *exprs;
+	List	   *cmpfns;
+	Bitmapset  *nullkeys;
+} PartitionPruneStepOp;
+
+/*
+ * PartitionPruneStepCombine - Information to prune using a BoolExpr clause
+ *
+ * For BoolExpr clauses, we combine the set of partitions determined for each
+ * of the argument clauses.
+ */
+typedef enum PartitionPruneCombineOp
+{
+	PARTPRUNE_COMBINE_UNION,
+	PARTPRUNE_COMBINE_INTERSECT
+} PartitionPruneCombineOp;
+
+typedef struct PartitionPruneStepCombine
+{
+	PartitionPruneStep step;
+
+	PartitionPruneCombineOp combineOp;
+	List	   *source_stepids;
+} PartitionPruneStepCombine;
+
+
+/*
+ * Plan invalidation info
+ *
+ * We track the objects on which a PlannedStmt depends in two ways:
+ * relations are recorded as a simple list of OIDs, and everything else
+ * is represented as a list of PlanInvalItems.  A PlanInvalItem is designed
+ * to be used with the syscache invalidation mechanism, so it identifies a
+ * system catalog entry by cache ID and hash value.
+ */
+typedef struct PlanInvalItem
+{
+	NodeTag		type;
+	int			cacheId;		/* a syscache ID, see utils/syscache.h */
+	uint32		hashValue;		/* hash value of object's cache lookup key */
+} PlanInvalItem;
+
+#endif							/* PLANNODES_H */