Quelle  restrictinfo.h

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

#include "nodes/pathnodes.h"


/* Convenience macro for the common case of a valid-everywhere qual */
#define make_simple_restrictinfo(root, clause)  \
 make_restrictinfo(root, clause, true, false, false, false, 0, \
  NULL, NULL, NULL)

extern RestrictInfo *make_plain_restrictinfo(PlannerInfo *root,
            Expr *clause,
            Expr *orclause,
            bool is_pushed_down,
            bool has_clone,
            bool is_clone,
            bool pseudoconstant,
            Index security_level,
            Relids required_relids,
            Relids incompatible_relids,
            Relids outer_relids);
extern RestrictInfo *make_restrictinfo(PlannerInfo *root,
            Expr *clause,
            bool is_pushed_down,
            bool has_clone,
            bool is_clone,
            bool pseudoconstant,
            Index security_level,
            Relids required_relids,
            Relids incompatible_relids,
            Relids outer_relids);
extern RestrictInfo *commute_restrictinfo(RestrictInfo *rinfo, Oid comm_op);
extern bool restriction_is_or_clause(RestrictInfo *restrictinfo);
extern bool restriction_is_securely_promotable(RestrictInfo *restrictinfo,
              RelOptInfo *rel);
extern List *get_actual_clauses(List *restrictinfo_list);
extern List *extract_actual_clauses(List *restrictinfo_list,
         bool pseudoconstant);
extern void extract_actual_join_clauses(List *restrictinfo_list,
          Relids joinrelids,
          List **joinquals,
          List **otherquals);
extern bool join_clause_is_movable_to(RestrictInfo *rinfo, RelOptInfo *baserel);
extern bool join_clause_is_movable_into(RestrictInfo *rinfo,
          Relids currentrelids,
          Relids current_and_outer);

/*
 * clause_sides_match_join
 *   Determine whether a join clause is of the right form to use in this join.
 *
 * We already know that the clause is a binary opclause referencing only the
 * rels in the current join.  The point here is to check whether it has the
 * form "outerrel_expr op innerrel_expr" or "innerrel_expr op outerrel_expr",
 * rather than mixing outer and inner vars on either side.  If it matches,
 * we set the transient flag outer_is_left to identify which side is which.
 */
static inline bool
clause_sides_match_join(RestrictInfo *rinfo, Relids outerrelids,
      Relids innerrelids)
{
 if (bms_is_subset(rinfo->left_relids, outerrelids) &&
  bms_is_subset(rinfo->right_relids, innerrelids))
 {
  /* lefthand side is outer */
  rinfo->outer_is_left = true;
  return true;
 }
 else if (bms_is_subset(rinfo->left_relids, innerrelids) &&
    bms_is_subset(rinfo->right_relids, outerrelids))
 {
  /* righthand side is outer */
  rinfo->outer_is_left = false;
  return true;
 }
 return false;    /* no good for these input relations */
}

#endif       /* RESTRICTINFO_H */