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b3aaf9081a
Formerly, set_subquery_pathlist and other creators of plans for subqueries saved only the rangetable and rowMarks lists from the lower-level PlannerInfo. But there's no reason not to remember the whole PlannerInfo, and indeed this turns out to simplify matters in a number of places. The immediate reason for doing this was so that the subroot will still be accessible when we're trying to extract column statistics out of an already-planned subquery. But now that I've done it, it seems like a good code-beautification effort in its own right. I also chose to get rid of the transient subrtable and subrowmark fields in SubqueryScan nodes, in favor of having setrefs.c look up the subquery's RelOptInfo. That required changing all the APIs in setrefs.c to pass PlannerInfo not PlannerGlobal, which was a large but quite mechanical transformation. One side-effect not foreseen at the beginning is that this finally broke inheritance_planner's assumption that replanning the same subquery RTE N times would necessarily give interchangeable results each time. That assumption was always pretty risky, but now we really have to make a separate RTE for each instance so that there's a place to carry the separate subroots.
147 lines
5.7 KiB
C
147 lines
5.7 KiB
C
/*-------------------------------------------------------------------------
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*
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* cost.h
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* prototypes for costsize.c and clausesel.c.
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*
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*
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* Portions Copyright (c) 1996-2011, PostgreSQL Global Development Group
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* Portions Copyright (c) 1994, Regents of the University of California
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*
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* src/include/optimizer/cost.h
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*
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*-------------------------------------------------------------------------
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*/
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#ifndef COST_H
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#define COST_H
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#include "nodes/plannodes.h"
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#include "nodes/relation.h"
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/* defaults for costsize.c's Cost parameters */
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/* NB: cost-estimation code should use the variables, not these constants! */
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/* If you change these, update backend/utils/misc/postgresql.sample.conf */
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#define DEFAULT_SEQ_PAGE_COST 1.0
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#define DEFAULT_RANDOM_PAGE_COST 4.0
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#define DEFAULT_CPU_TUPLE_COST 0.01
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#define DEFAULT_CPU_INDEX_TUPLE_COST 0.005
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#define DEFAULT_CPU_OPERATOR_COST 0.0025
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#define DEFAULT_EFFECTIVE_CACHE_SIZE 16384 /* measured in pages */
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typedef enum
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{
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CONSTRAINT_EXCLUSION_OFF, /* do not use c_e */
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CONSTRAINT_EXCLUSION_ON, /* apply c_e to all rels */
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CONSTRAINT_EXCLUSION_PARTITION /* apply c_e to otherrels only */
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} ConstraintExclusionType;
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/*
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* prototypes for costsize.c
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* routines to compute costs and sizes
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*/
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/* parameter variables and flags */
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extern PGDLLIMPORT double seq_page_cost;
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extern PGDLLIMPORT double random_page_cost;
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extern PGDLLIMPORT double cpu_tuple_cost;
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extern PGDLLIMPORT double cpu_index_tuple_cost;
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extern PGDLLIMPORT double cpu_operator_cost;
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extern PGDLLIMPORT int effective_cache_size;
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extern Cost disable_cost;
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extern bool enable_seqscan;
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extern bool enable_indexscan;
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extern bool enable_bitmapscan;
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extern bool enable_tidscan;
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extern bool enable_sort;
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extern bool enable_hashagg;
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extern bool enable_nestloop;
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extern bool enable_material;
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extern bool enable_mergejoin;
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extern bool enable_hashjoin;
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extern int constraint_exclusion;
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extern double clamp_row_est(double nrows);
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extern double index_pages_fetched(double tuples_fetched, BlockNumber pages,
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double index_pages, PlannerInfo *root);
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extern void cost_seqscan(Path *path, PlannerInfo *root, RelOptInfo *baserel);
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extern void cost_index(IndexPath *path, PlannerInfo *root, IndexOptInfo *index,
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List *indexQuals, List *indexOrderBys, RelOptInfo *outer_rel);
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extern void cost_bitmap_heap_scan(Path *path, PlannerInfo *root, RelOptInfo *baserel,
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Path *bitmapqual, RelOptInfo *outer_rel);
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extern void cost_bitmap_and_node(BitmapAndPath *path, PlannerInfo *root);
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extern void cost_bitmap_or_node(BitmapOrPath *path, PlannerInfo *root);
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extern void cost_bitmap_tree_node(Path *path, Cost *cost, Selectivity *selec);
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extern void cost_tidscan(Path *path, PlannerInfo *root,
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RelOptInfo *baserel, List *tidquals);
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extern void cost_subqueryscan(Path *path, RelOptInfo *baserel);
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extern void cost_functionscan(Path *path, PlannerInfo *root,
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RelOptInfo *baserel);
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extern void cost_valuesscan(Path *path, PlannerInfo *root,
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RelOptInfo *baserel);
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extern void cost_ctescan(Path *path, PlannerInfo *root, RelOptInfo *baserel);
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extern void cost_recursive_union(Plan *runion, Plan *nrterm, Plan *rterm);
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extern void cost_sort(Path *path, PlannerInfo *root,
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List *pathkeys, Cost input_cost, double tuples, int width,
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Cost comparison_cost, int sort_mem,
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double limit_tuples);
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extern void cost_merge_append(Path *path, PlannerInfo *root,
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List *pathkeys, int n_streams,
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Cost input_startup_cost, Cost input_total_cost,
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double tuples);
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extern void cost_material(Path *path,
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Cost input_startup_cost, Cost input_total_cost,
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double tuples, int width);
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extern void cost_agg(Path *path, PlannerInfo *root,
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AggStrategy aggstrategy, const AggClauseCosts *aggcosts,
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int numGroupCols, double numGroups,
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Cost input_startup_cost, Cost input_total_cost,
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double input_tuples);
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extern void cost_windowagg(Path *path, PlannerInfo *root,
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List *windowFuncs, int numPartCols, int numOrderCols,
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Cost input_startup_cost, Cost input_total_cost,
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double input_tuples);
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extern void cost_group(Path *path, PlannerInfo *root,
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int numGroupCols, double numGroups,
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Cost input_startup_cost, Cost input_total_cost,
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double input_tuples);
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extern void cost_nestloop(NestPath *path, PlannerInfo *root,
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SpecialJoinInfo *sjinfo);
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extern void cost_mergejoin(MergePath *path, PlannerInfo *root,
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SpecialJoinInfo *sjinfo);
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extern void cost_hashjoin(HashPath *path, PlannerInfo *root,
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SpecialJoinInfo *sjinfo);
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extern void cost_subplan(PlannerInfo *root, SubPlan *subplan, Plan *plan);
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extern void cost_qual_eval(QualCost *cost, List *quals, PlannerInfo *root);
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extern void cost_qual_eval_node(QualCost *cost, Node *qual, PlannerInfo *root);
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extern void set_baserel_size_estimates(PlannerInfo *root, RelOptInfo *rel);
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extern void set_joinrel_size_estimates(PlannerInfo *root, RelOptInfo *rel,
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RelOptInfo *outer_rel,
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RelOptInfo *inner_rel,
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SpecialJoinInfo *sjinfo,
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List *restrictlist);
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extern void set_subquery_size_estimates(PlannerInfo *root, RelOptInfo *rel);
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extern void set_function_size_estimates(PlannerInfo *root, RelOptInfo *rel);
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extern void set_values_size_estimates(PlannerInfo *root, RelOptInfo *rel);
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extern void set_cte_size_estimates(PlannerInfo *root, RelOptInfo *rel,
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Plan *cteplan);
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extern void set_foreign_size_estimates(PlannerInfo *root, RelOptInfo *rel);
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/*
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* prototypes for clausesel.c
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* routines to compute clause selectivities
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*/
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extern Selectivity clauselist_selectivity(PlannerInfo *root,
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List *clauses,
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int varRelid,
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JoinType jointype,
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SpecialJoinInfo *sjinfo);
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extern Selectivity clause_selectivity(PlannerInfo *root,
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Node *clause,
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int varRelid,
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JoinType jointype,
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SpecialJoinInfo *sjinfo);
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#endif /* COST_H */
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