planner.h

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/*-------------------------------------------------------------------------
 *
 * 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) 1996-2026, 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"
 
 
typedef struct ExplainState ExplainState;   /* defined in explain_state.h */
 
/* Hook for plugins to get control in planner() */
typedef PlannedStmt *(*planner_hook_type) (Query *parse,
                                           const char *query_string,
                                           int cursorOptions,
                                           ParamListInfo boundParams,
                                           ExplainState *es);
extern PGDLLIMPORT planner_hook_type planner_hook;
 
/* Hook for plugins to get control after PlannerGlobal is initialized */
typedef void (*planner_setup_hook_type) (PlannerGlobal *glob, Query *parse,
                                         const char *query_string,
                                         int cursorOptions,
                                         double *tuple_fraction,
                                         ExplainState *es);
extern PGDLLIMPORT planner_setup_hook_type planner_setup_hook;
 
/* Hook for plugins to get control before PlannerGlobal is discarded */
typedef void (*planner_shutdown_hook_type) (PlannerGlobal *glob, Query *parse,
                                            const char *query_string,
                                            PlannedStmt *pstmt);
extern PGDLLIMPORT planner_shutdown_hook_type planner_shutdown_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,
                                     ExplainState *es);
 
extern PlannerInfo *subquery_planner(PlannerGlobal *glob, Query *parse,
                                     char *plan_name,
                                     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);
 
extern RelOptInfo *create_unique_paths(PlannerInfo *root, RelOptInfo *rel,
                                       SpecialJoinInfo *sjinfo);
 
extern char *choose_plan_name(PlannerGlobal *glob, const char *name,
                              bool always_number);
 
#endif                          /* PLANNER_H */