Quelle  planner.h

/*-------------------------------------------------------------------------
 *
 * planner.h
 *   prototypes for planner.c.
 *
 * Note that the primary entry points for planner.c are declared in
 * optimizer/optimizer.h, because they're intended to be called from
 * non-planner code.  Declarations here are meant for use by other
 * planner modules.
 *
 * Portions Copyright (c) 1996-2025, PostgreSQL Global Development Group
 * Portions Copyright (c) 1994, Regents of the University of California
 *
 * src/include/optimizer/planner.h
 *
 *-------------------------------------------------------------------------
 */
#ifndef PLANNER_H
#define PLANNER_H

#include "nodes/pathnodes.h"
#include "nodes/plannodes.h"


/* Hook for plugins to get control in planner() */
typedef PlannedStmt *(*planner_hook_type) (Query *parse,
             const char *query_string,
             int cursorOptions,
             ParamListInfo boundParams);
extern PGDLLIMPORT planner_hook_type planner_hook;

/* Hook for plugins to get control when grouping_planner() plans upper rels */
typedef void (*create_upper_paths_hook_type) (PlannerInfo *root,
             UpperRelationKind stage,
             RelOptInfo *input_rel,
             RelOptInfo *output_rel,
             void *extra);
extern PGDLLIMPORT create_upper_paths_hook_type create_upper_paths_hook;


extern PlannedStmt *standard_planner(Query *parse, const char *query_string,
          int cursorOptions,
          ParamListInfo boundParams);

extern PlannerInfo *subquery_planner(PlannerGlobal *glob, Query *parse,
          PlannerInfo *parent_root,
          bool hasRecursion, double tuple_fraction,
          SetOperationStmt *setops);

extern RowMarkType select_rowmark_type(RangeTblEntry *rte,
            LockClauseStrength strength);

extern bool limit_needed(Query *parse);

extern void mark_partial_aggref(Aggref *agg, AggSplit aggsplit);

extern Path *get_cheapest_fractional_path(RelOptInfo *rel,
            double tuple_fraction);

extern Expr *preprocess_phv_expression(PlannerInfo *root, Expr *expr);

#endif       /* PLANNER_H */