geqo.h

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/*-------------------------------------------------------------------------
 *
 * geqo.h
 *    prototypes for various files in optimizer/geqo
 *
 * Portions Copyright (c) 1996-2026, PostgreSQL Global Development Group
 * Portions Copyright (c) 1994, Regents of the University of California
 *
 * src/include/optimizer/geqo.h
 *
 *-------------------------------------------------------------------------
 */
 
/*
 * contributed by:
 * =*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=
 * *  Martin Utesch              * Institute of Automatic Control      *
 * =                             = University of Mining and Technology =
 * *  utesch@aut.tu-freiberg.de  * Freiberg, Germany                   *
 * =*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=
 */
 
#ifndef GEQO_H
#define GEQO_H
 
#include "common/pg_prng.h"
#include "nodes/pathnodes.h"
#include "optimizer/extendplan.h"
#include "optimizer/geqo_gene.h"
 
 
/* GEQO debug flag */
/*
 * #define GEQO_DEBUG
 */
 
/* choose one recombination mechanism here */
/*
 * #define ERX
 * #define PMX
 * #define CX
 * #define PX
 * #define OX1
 * #define OX2
 */
#define ERX
 
 
/*
 * Configuration options
 *
 * If you change these, update backend/utils/misc/postgresql.conf.sample
 */
extern PGDLLIMPORT int Geqo_effort; /* 1 .. 10, knob for adjustment of
                                     * defaults */
 
#define DEFAULT_GEQO_EFFORT 5
#define MIN_GEQO_EFFORT 1
#define MAX_GEQO_EFFORT 10
 
extern PGDLLIMPORT int Geqo_pool_size;  /* 2 .. inf, or 0 to use default */
 
extern PGDLLIMPORT int Geqo_generations;    /* 1 .. inf, or 0 to use default */
 
extern PGDLLIMPORT double Geqo_selection_bias;
 
extern PGDLLIMPORT int Geqo_planner_extension_id;
 
#define DEFAULT_GEQO_SELECTION_BIAS 2.0
#define MIN_GEQO_SELECTION_BIAS 1.5
#define MAX_GEQO_SELECTION_BIAS 2.0
 
extern PGDLLIMPORT double Geqo_seed;    /* 0 .. 1 */
 
 
/*
 * Private state for a GEQO run --- accessible via GetGeqoPrivateData
 */
typedef struct
{
    List       *initial_rels;   /* the base relations we are joining */
    pg_prng_state random_state; /* PRNG state */
} GeqoPrivateData;
 
static inline GeqoPrivateData *
GetGeqoPrivateData(PlannerInfo *root)
{
    /* headers must be C++-compliant, so the cast is required here */
    return (GeqoPrivateData *)
        GetPlannerInfoExtensionState(root, Geqo_planner_extension_id);
}
 
/* routines in geqo_main.c */
extern RelOptInfo *geqo(PlannerInfo *root,
                        int number_of_rels, List *initial_rels);
 
/* routines in geqo_eval.c */
extern Cost geqo_eval(PlannerInfo *root, Gene *tour, int num_gene);
extern RelOptInfo *gimme_tree(PlannerInfo *root, Gene *tour, int num_gene);
 
#endif                          /* GEQO_H */