Quelle  placeholder.h

/*-------------------------------------------------------------------------
 *
 * placeholder.h
 *   prototypes for optimizer/util/placeholder.c.
 *
 *
 * Portions Copyright (c) 1996-2025, PostgreSQL Global Development Group
 * Portions Copyright (c) 1994, Regents of the University of California
 *
 * src/include/optimizer/placeholder.h
 *
 *-------------------------------------------------------------------------
 */
#ifndef PLACEHOLDER_H
#define PLACEHOLDER_H

#include "nodes/pathnodes.h"


extern PlaceHolderVar *make_placeholder_expr(PlannerInfo *root, Expr *expr,
            Relids phrels);
extern PlaceHolderInfo *find_placeholder_info(PlannerInfo *root,
             PlaceHolderVar *phv);
extern void find_placeholders_in_jointree(PlannerInfo *root);
extern void fix_placeholder_input_needed_levels(PlannerInfo *root);
extern void rebuild_placeholder_attr_needed(PlannerInfo *root);
extern void add_placeholders_to_base_rels(PlannerInfo *root);
extern void add_placeholders_to_joinrel(PlannerInfo *root, RelOptInfo *joinrel,
          RelOptInfo *outer_rel, RelOptInfo *inner_rel,
          SpecialJoinInfo *sjinfo);
extern bool contain_placeholder_references_to(PlannerInfo *root, Node *clause,
             int relid);
extern Relids get_placeholder_nulling_relids(PlannerInfo *root,
            PlaceHolderInfo *phinfo);
extern Node *strip_noop_phvs(Node *node);

#endif       /* PLACEHOLDER_H */