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src/include/optimizer/cost.h
228 строк
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David Rowley
Show estimated number of groups for Incremental Sort in EXPLAIN
8 часов назад
8 часов назад
d29d469
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/*------------------------------------------------------------------------- * * cost.h * prototypes for costsize.c and clausesel.c. * * * Portions Copyright (c) 1996-2026, PostgreSQL Global Development Group * Portions Copyright (c) 1994, Regents of the University of California * * src/include/optimizer/cost.h * *------------------------------------------------------------------------- */ #ifndef COST_H #define COST_H #include "nodes/pathnodes.h" #include "nodes/plannodes.h" /* defaults for costsize.c's Cost parameters */ /* NB: cost-estimation code should use the variables, not these constants! */ /* If you change these, update backend/utils/misc/postgresql.conf.sample */ #define DEFAULT_SEQ_PAGE_COST 1.0 #define DEFAULT_RANDOM_PAGE_COST 4.0 #define DEFAULT_CPU_TUPLE_COST 0.01 #define DEFAULT_CPU_INDEX_TUPLE_COST 0.005 #define DEFAULT_CPU_OPERATOR_COST 0.0025 #define DEFAULT_PARALLEL_TUPLE_COST 0.1 #define DEFAULT_PARALLEL_SETUP_COST 1000.0 /* defaults for non-Cost parameters */ #define DEFAULT_RECURSIVE_WORKTABLE_FACTOR 10.0 #define DEFAULT_EFFECTIVE_CACHE_SIZE 524288 /* measured in pages */ typedef enum { CONSTRAINT_EXCLUSION_OFF, /* do not use c_e */ CONSTRAINT_EXCLUSION_ON, /* apply c_e to all rels */ CONSTRAINT_EXCLUSION_PARTITION, /* apply c_e to otherrels only */ } ConstraintExclusionType; /* * prototypes for costsize.c * routines to compute costs and sizes */ /* parameter variables and flags (see also optimizer.h) */ extern PGDLLIMPORT Cost disable_cost; extern PGDLLIMPORT int max_parallel_workers_per_gather; extern PGDLLIMPORT bool enable_seqscan; extern PGDLLIMPORT bool enable_indexscan; extern PGDLLIMPORT bool enable_indexonlyscan; extern PGDLLIMPORT bool enable_bitmapscan; extern PGDLLIMPORT bool enable_tidscan; extern PGDLLIMPORT bool enable_sort; extern PGDLLIMPORT bool enable_incremental_sort; extern PGDLLIMPORT bool enable_hashagg; extern PGDLLIMPORT bool enable_groupagg; extern PGDLLIMPORT bool enable_nestloop; extern PGDLLIMPORT bool enable_material; extern PGDLLIMPORT bool enable_memoize; extern PGDLLIMPORT bool enable_mergejoin; extern PGDLLIMPORT bool enable_hashjoin; extern PGDLLIMPORT bool enable_gathermerge; extern PGDLLIMPORT bool enable_partitionwise_join; extern PGDLLIMPORT bool enable_partitionwise_aggregate; extern PGDLLIMPORT bool enable_parallel_append; extern PGDLLIMPORT bool enable_parallel_hash; extern PGDLLIMPORT bool enable_partition_pruning; extern PGDLLIMPORT bool enable_presorted_aggregate; extern PGDLLIMPORT bool enable_async_append; extern PGDLLIMPORT int constraint_exclusion; extern double index_pages_fetched(double tuples_fetched, BlockNumber pages, double index_pages, PlannerInfo *root); extern void cost_seqscan(Path *path, PlannerInfo *root, RelOptInfo *baserel, ParamPathInfo *param_info); extern void cost_samplescan(Path *path, PlannerInfo *root, RelOptInfo *baserel, ParamPathInfo *param_info); extern void cost_index(IndexPath *path, PlannerInfo *root, double loop_count, bool partial_path); extern void cost_bitmap_heap_scan(Path *path, PlannerInfo *root, RelOptInfo *baserel, ParamPathInfo *param_info, Path *bitmapqual, double loop_count); extern void cost_bitmap_and_node(BitmapAndPath *path, PlannerInfo *root); extern void cost_bitmap_or_node(BitmapOrPath *path, PlannerInfo *root); extern void cost_bitmap_tree_node(Path *path, Cost *cost, Selectivity *selec); extern void cost_tidscan(Path *path, PlannerInfo *root, RelOptInfo *baserel, List *tidquals, ParamPathInfo *param_info); extern void cost_tidrangescan(Path *path, PlannerInfo *root, RelOptInfo *baserel, List *tidrangequals, ParamPathInfo *param_info); extern void cost_subqueryscan(SubqueryScanPath *path, PlannerInfo *root, RelOptInfo *baserel, ParamPathInfo *param_info, bool trivial_pathtarget); extern void cost_functionscan(Path *path, PlannerInfo *root, RelOptInfo *baserel, ParamPathInfo *param_info); extern void cost_valuesscan(Path *path, PlannerInfo *root, RelOptInfo *baserel, ParamPathInfo *param_info); extern void cost_tablefuncscan(Path *path, PlannerInfo *root, RelOptInfo *baserel, ParamPathInfo *param_info); extern void cost_ctescan(Path *path, PlannerInfo *root, RelOptInfo *baserel, ParamPathInfo *param_info); extern void cost_namedtuplestorescan(Path *path, PlannerInfo *root, RelOptInfo *baserel, ParamPathInfo *param_info); extern void cost_resultscan(Path *path, PlannerInfo *root, RelOptInfo *baserel, ParamPathInfo *param_info); extern void cost_recursive_union(Path *runion, Path *nrterm, Path *rterm); extern void cost_sort(Path *path, PlannerInfo *root, List *pathkeys, int input_disabled_nodes, Cost input_cost, double tuples, int width, Cost comparison_cost, int sort_mem, double limit_tuples); extern void cost_incremental_sort(Path *path, PlannerInfo *root, List *pathkeys, int presorted_keys, int input_disabled_nodes, Cost input_startup_cost, Cost input_total_cost, double input_tuples, int width, Cost comparison_cost, int sort_mem, double limit_tuples, Cardinality *num_groups); extern void cost_append(AppendPath *apath, PlannerInfo *root); extern void cost_merge_append(Path *path, PlannerInfo *root, List *pathkeys, int n_streams, int input_disabled_nodes, Cost input_startup_cost, Cost input_total_cost, double tuples); extern void cost_material(Path *path, bool enabled, int input_disabled_nodes, Cost input_startup_cost, Cost input_total_cost, double tuples, int width); extern void cost_agg(Path *path, PlannerInfo *root, AggStrategy aggstrategy, const AggClauseCosts *aggcosts, int numGroupCols, double numGroups, List *quals, int disabled_nodes, Cost input_startup_cost, Cost input_total_cost, double input_tuples, double input_width); extern void cost_windowagg(Path *path, PlannerInfo *root, List *windowFuncs, WindowClause *winclause, int input_disabled_nodes, Cost input_startup_cost, Cost input_total_cost, double input_tuples); extern void cost_group(Path *path, PlannerInfo *root, int numGroupCols, double numGroups, List *quals, int input_disabled_nodes, Cost input_startup_cost, Cost input_total_cost, double input_tuples); extern void initial_cost_nestloop(PlannerInfo *root, JoinCostWorkspace *workspace, JoinType jointype, uint64 enable_mask, Path *outer_path, Path *inner_path, JoinPathExtraData *extra); extern void final_cost_nestloop(PlannerInfo *root, NestPath *path, JoinCostWorkspace *workspace, JoinPathExtraData *extra); extern void initial_cost_mergejoin(PlannerInfo *root, JoinCostWorkspace *workspace, JoinType jointype, List *mergeclauses, Path *outer_path, Path *inner_path, List *outersortkeys, List *innersortkeys, int outer_presorted_keys, JoinPathExtraData *extra); extern void final_cost_mergejoin(PlannerInfo *root, MergePath *path, JoinCostWorkspace *workspace, JoinPathExtraData *extra); extern void initial_cost_hashjoin(PlannerInfo *root, JoinCostWorkspace *workspace, JoinType jointype, List *hashclauses, Path *outer_path, Path *inner_path, JoinPathExtraData *extra, bool parallel_hash); extern void final_cost_hashjoin(PlannerInfo *root, HashPath *path, JoinCostWorkspace *workspace, JoinPathExtraData *extra); extern void cost_gather(GatherPath *path, PlannerInfo *root, RelOptInfo *rel, ParamPathInfo *param_info, double *rows); extern void cost_gather_merge(GatherMergePath *path, PlannerInfo *root, RelOptInfo *rel, ParamPathInfo *param_info, int input_disabled_nodes, Cost input_startup_cost, Cost input_total_cost, double *rows); extern void cost_subplan(PlannerInfo *root, SubPlan *subplan, Plan *plan); extern void cost_qual_eval(QualCost *cost, List *quals, PlannerInfo *root); extern void cost_qual_eval_node(QualCost *cost, Node *qual, PlannerInfo *root); extern void compute_semi_anti_join_factors(PlannerInfo *root, RelOptInfo *joinrel, RelOptInfo *outerrel, RelOptInfo *innerrel, JoinType jointype, SpecialJoinInfo *sjinfo, List *restrictlist, SemiAntiJoinFactors *semifactors); extern void set_baserel_size_estimates(PlannerInfo *root, RelOptInfo *rel); extern double get_parameterized_baserel_size(PlannerInfo *root, RelOptInfo *rel, List *param_clauses); extern double get_parameterized_joinrel_size(PlannerInfo *root, RelOptInfo *rel, Path *outer_path, Path *inner_path, SpecialJoinInfo *sjinfo, List *restrict_clauses); extern void set_joinrel_size_estimates(PlannerInfo *root, RelOptInfo *rel, RelOptInfo *outer_rel, RelOptInfo *inner_rel, SpecialJoinInfo *sjinfo, List *restrictlist); extern void set_subquery_size_estimates(PlannerInfo *root, RelOptInfo *rel); extern void set_function_size_estimates(PlannerInfo *root, RelOptInfo *rel); extern void set_values_size_estimates(PlannerInfo *root, RelOptInfo *rel); extern void set_cte_size_estimates(PlannerInfo *root, RelOptInfo *rel, double cte_rows); extern void set_tablefunc_size_estimates(PlannerInfo *root, RelOptInfo *rel); extern void set_namedtuplestore_size_estimates(PlannerInfo *root, RelOptInfo *rel); extern void set_result_size_estimates(PlannerInfo *root, RelOptInfo *rel); extern void set_foreign_size_estimates(PlannerInfo *root, RelOptInfo *rel); extern PathTarget *set_pathtarget_cost_width(PlannerInfo *root, PathTarget *target); extern double compute_bitmap_pages(PlannerInfo *root, RelOptInfo *baserel, Path *bitmapqual, double loop_count, Cost *cost_p, double *tuples_p); extern double compute_gather_rows(Path *path); #endif /* COST_H */