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eab6b8b27e
useless substructure for its RangeTblEntry nodes. (I chose to keep using the same struct node type and just zero out the link fields for unneeded info, rather than making a separate ExecRangeTblEntry type --- it seemed too fragile to have two different rangetable representations.) Along the way, put subplans into a list in the toplevel PlannedStmt node, and have SubPlan nodes refer to them by list index instead of direct pointers. Vadim wanted to do that years ago, but I never understood what he was on about until now. It makes things a *whole* lot more robust, because we can stop worrying about duplicate processing of subplans during expression tree traversals. That's been a constant source of bugs, and it's finally gone. There are some consequent simplifications yet to be made, like not using a separate EState for subplans in the executor, but I'll tackle that later.
116 lines
4.4 KiB
C
116 lines
4.4 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) 1996-2007, 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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* $PostgreSQL: pgsql/src/include/optimizer/cost.h,v 1.85 2007/02/22 22:00:26 tgl Exp $
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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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/*
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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 DLLIMPORT double seq_page_cost;
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extern DLLIMPORT double random_page_cost;
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extern DLLIMPORT double cpu_tuple_cost;
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extern DLLIMPORT double cpu_index_tuple_cost;
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extern DLLIMPORT double cpu_operator_cost;
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extern DLLIMPORT 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_mergejoin;
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extern bool enable_hashjoin;
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extern bool 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, 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_sort(Path *path, PlannerInfo *root,
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List *pathkeys, Cost input_cost, double tuples, int width);
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extern void cost_material(Path *path,
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Cost input_cost, double tuples, int width);
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extern void cost_agg(Path *path, PlannerInfo *root,
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AggStrategy aggstrategy, int numAggs,
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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_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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extern void cost_mergejoin(MergePath *path, PlannerInfo *root);
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extern void cost_hashjoin(HashPath *path, PlannerInfo *root);
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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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JoinType jointype,
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List *restrictlist);
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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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/*
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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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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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#endif /* COST_H */
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