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00001 /*------------------------------------------------------------------------- 00002 * 00003 * cost.h 00004 * prototypes for costsize.c and clausesel.c. 00005 * 00006 * 00007 * Portions Copyright (c) 1996-2013, PostgreSQL Global Development Group 00008 * Portions Copyright (c) 1994, Regents of the University of California 00009 * 00010 * src/include/optimizer/cost.h 00011 * 00012 *------------------------------------------------------------------------- 00013 */ 00014 #ifndef COST_H 00015 #define COST_H 00016 00017 #include "nodes/plannodes.h" 00018 #include "nodes/relation.h" 00019 00020 00021 /* defaults for costsize.c's Cost parameters */ 00022 /* NB: cost-estimation code should use the variables, not these constants! */ 00023 /* If you change these, update backend/utils/misc/postgresql.sample.conf */ 00024 #define DEFAULT_SEQ_PAGE_COST 1.0 00025 #define DEFAULT_RANDOM_PAGE_COST 4.0 00026 #define DEFAULT_CPU_TUPLE_COST 0.01 00027 #define DEFAULT_CPU_INDEX_TUPLE_COST 0.005 00028 #define DEFAULT_CPU_OPERATOR_COST 0.0025 00029 00030 #define DEFAULT_EFFECTIVE_CACHE_SIZE 16384 /* measured in pages */ 00031 00032 typedef enum 00033 { 00034 CONSTRAINT_EXCLUSION_OFF, /* do not use c_e */ 00035 CONSTRAINT_EXCLUSION_ON, /* apply c_e to all rels */ 00036 CONSTRAINT_EXCLUSION_PARTITION /* apply c_e to otherrels only */ 00037 } ConstraintExclusionType; 00038 00039 00040 /* 00041 * prototypes for costsize.c 00042 * routines to compute costs and sizes 00043 */ 00044 00045 /* parameter variables and flags */ 00046 extern PGDLLIMPORT double seq_page_cost; 00047 extern PGDLLIMPORT double random_page_cost; 00048 extern PGDLLIMPORT double cpu_tuple_cost; 00049 extern PGDLLIMPORT double cpu_index_tuple_cost; 00050 extern PGDLLIMPORT double cpu_operator_cost; 00051 extern PGDLLIMPORT int effective_cache_size; 00052 extern Cost disable_cost; 00053 extern bool enable_seqscan; 00054 extern bool enable_indexscan; 00055 extern bool enable_indexonlyscan; 00056 extern bool enable_bitmapscan; 00057 extern bool enable_tidscan; 00058 extern bool enable_sort; 00059 extern bool enable_hashagg; 00060 extern bool enable_nestloop; 00061 extern bool enable_material; 00062 extern bool enable_mergejoin; 00063 extern bool enable_hashjoin; 00064 extern int constraint_exclusion; 00065 00066 extern double clamp_row_est(double nrows); 00067 extern double index_pages_fetched(double tuples_fetched, BlockNumber pages, 00068 double index_pages, PlannerInfo *root); 00069 extern void cost_seqscan(Path *path, PlannerInfo *root, RelOptInfo *baserel, 00070 ParamPathInfo *param_info); 00071 extern void cost_index(IndexPath *path, PlannerInfo *root, 00072 double loop_count); 00073 extern void cost_bitmap_heap_scan(Path *path, PlannerInfo *root, RelOptInfo *baserel, 00074 ParamPathInfo *param_info, 00075 Path *bitmapqual, double loop_count); 00076 extern void cost_bitmap_and_node(BitmapAndPath *path, PlannerInfo *root); 00077 extern void cost_bitmap_or_node(BitmapOrPath *path, PlannerInfo *root); 00078 extern void cost_bitmap_tree_node(Path *path, Cost *cost, Selectivity *selec); 00079 extern void cost_tidscan(Path *path, PlannerInfo *root, 00080 RelOptInfo *baserel, List *tidquals, ParamPathInfo *param_info); 00081 extern void cost_subqueryscan(Path *path, PlannerInfo *root, 00082 RelOptInfo *baserel, ParamPathInfo *param_info); 00083 extern void cost_functionscan(Path *path, PlannerInfo *root, 00084 RelOptInfo *baserel, ParamPathInfo *param_info); 00085 extern void cost_valuesscan(Path *path, PlannerInfo *root, 00086 RelOptInfo *baserel, ParamPathInfo *param_info); 00087 extern void cost_ctescan(Path *path, PlannerInfo *root, 00088 RelOptInfo *baserel, ParamPathInfo *param_info); 00089 extern void cost_recursive_union(Plan *runion, Plan *nrterm, Plan *rterm); 00090 extern void cost_sort(Path *path, PlannerInfo *root, 00091 List *pathkeys, Cost input_cost, double tuples, int width, 00092 Cost comparison_cost, int sort_mem, 00093 double limit_tuples); 00094 extern void cost_merge_append(Path *path, PlannerInfo *root, 00095 List *pathkeys, int n_streams, 00096 Cost input_startup_cost, Cost input_total_cost, 00097 double tuples); 00098 extern void cost_material(Path *path, 00099 Cost input_startup_cost, Cost input_total_cost, 00100 double tuples, int width); 00101 extern void cost_agg(Path *path, PlannerInfo *root, 00102 AggStrategy aggstrategy, const AggClauseCosts *aggcosts, 00103 int numGroupCols, double numGroups, 00104 Cost input_startup_cost, Cost input_total_cost, 00105 double input_tuples); 00106 extern void cost_windowagg(Path *path, PlannerInfo *root, 00107 List *windowFuncs, int numPartCols, int numOrderCols, 00108 Cost input_startup_cost, Cost input_total_cost, 00109 double input_tuples); 00110 extern void cost_group(Path *path, PlannerInfo *root, 00111 int numGroupCols, double numGroups, 00112 Cost input_startup_cost, Cost input_total_cost, 00113 double input_tuples); 00114 extern void initial_cost_nestloop(PlannerInfo *root, 00115 JoinCostWorkspace *workspace, 00116 JoinType jointype, 00117 Path *outer_path, Path *inner_path, 00118 SpecialJoinInfo *sjinfo, 00119 SemiAntiJoinFactors *semifactors); 00120 extern void final_cost_nestloop(PlannerInfo *root, NestPath *path, 00121 JoinCostWorkspace *workspace, 00122 SpecialJoinInfo *sjinfo, 00123 SemiAntiJoinFactors *semifactors); 00124 extern void initial_cost_mergejoin(PlannerInfo *root, 00125 JoinCostWorkspace *workspace, 00126 JoinType jointype, 00127 List *mergeclauses, 00128 Path *outer_path, Path *inner_path, 00129 List *outersortkeys, List *innersortkeys, 00130 SpecialJoinInfo *sjinfo); 00131 extern void final_cost_mergejoin(PlannerInfo *root, MergePath *path, 00132 JoinCostWorkspace *workspace, 00133 SpecialJoinInfo *sjinfo); 00134 extern void initial_cost_hashjoin(PlannerInfo *root, 00135 JoinCostWorkspace *workspace, 00136 JoinType jointype, 00137 List *hashclauses, 00138 Path *outer_path, Path *inner_path, 00139 SpecialJoinInfo *sjinfo, 00140 SemiAntiJoinFactors *semifactors); 00141 extern void final_cost_hashjoin(PlannerInfo *root, HashPath *path, 00142 JoinCostWorkspace *workspace, 00143 SpecialJoinInfo *sjinfo, 00144 SemiAntiJoinFactors *semifactors); 00145 extern void cost_subplan(PlannerInfo *root, SubPlan *subplan, Plan *plan); 00146 extern void cost_qual_eval(QualCost *cost, List *quals, PlannerInfo *root); 00147 extern void cost_qual_eval_node(QualCost *cost, Node *qual, PlannerInfo *root); 00148 extern void compute_semi_anti_join_factors(PlannerInfo *root, 00149 RelOptInfo *outerrel, 00150 RelOptInfo *innerrel, 00151 JoinType jointype, 00152 SpecialJoinInfo *sjinfo, 00153 List *restrictlist, 00154 SemiAntiJoinFactors *semifactors); 00155 extern void set_baserel_size_estimates(PlannerInfo *root, RelOptInfo *rel); 00156 extern double get_parameterized_baserel_size(PlannerInfo *root, 00157 RelOptInfo *rel, 00158 List *param_clauses); 00159 extern double get_parameterized_joinrel_size(PlannerInfo *root, 00160 RelOptInfo *rel, 00161 double outer_rows, 00162 double inner_rows, 00163 SpecialJoinInfo *sjinfo, 00164 List *restrict_clauses); 00165 extern void set_joinrel_size_estimates(PlannerInfo *root, RelOptInfo *rel, 00166 RelOptInfo *outer_rel, 00167 RelOptInfo *inner_rel, 00168 SpecialJoinInfo *sjinfo, 00169 List *restrictlist); 00170 extern void set_subquery_size_estimates(PlannerInfo *root, RelOptInfo *rel); 00171 extern void set_function_size_estimates(PlannerInfo *root, RelOptInfo *rel); 00172 extern void set_values_size_estimates(PlannerInfo *root, RelOptInfo *rel); 00173 extern void set_cte_size_estimates(PlannerInfo *root, RelOptInfo *rel, 00174 Plan *cteplan); 00175 extern void set_foreign_size_estimates(PlannerInfo *root, RelOptInfo *rel); 00176 00177 /* 00178 * prototypes for clausesel.c 00179 * routines to compute clause selectivities 00180 */ 00181 extern Selectivity clauselist_selectivity(PlannerInfo *root, 00182 List *clauses, 00183 int varRelid, 00184 JoinType jointype, 00185 SpecialJoinInfo *sjinfo); 00186 extern Selectivity clause_selectivity(PlannerInfo *root, 00187 Node *clause, 00188 int varRelid, 00189 JoinType jointype, 00190 SpecialJoinInfo *sjinfo); 00191 00192 #endif /* COST_H */
1.7.1