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9ff79b9d4e
This patch takes care of a number of problems having to do with failure to choose valid join orders and incorrect handling of lateral references pulled up from subqueries. Notable changes: * Add a LateralJoinInfo data structure similar to SpecialJoinInfo, to represent join ordering constraints created by lateral references. (I first considered extending the SpecialJoinInfo structure, but the semantics are different enough that a separate data structure seems better.) Extend join_is_legal() and related functions to prevent trying to form unworkable joins, and to ensure that we will consider joins that satisfy lateral references even if the joins would be clauseless. * Fill in the infrastructure needed for the last few types of relation scan paths to support parameterization. We'd have wanted this eventually anyway, but it is necessary now because a relation that gets pulled up out of a UNION ALL subquery may acquire a reltargetlist containing lateral references, meaning that its paths *have* to be parameterized whether or not we have any code that can push join quals down into the scan. * Compute data about lateral references early in query_planner(), and save in RelOptInfo nodes, to avoid repetitive calculations later. * Assorted corner-case bug fixes. There's probably still some bugs left, but this is a lot closer to being real than it was before.
134 lines
5.0 KiB
C
134 lines
5.0 KiB
C
/*-------------------------------------------------------------------------
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*
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* planmain.h
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* prototypes for various files in optimizer/plan
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*
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*
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* Portions Copyright (c) 1996-2012, 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/planmain.h
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*
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*-------------------------------------------------------------------------
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*/
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#ifndef PLANMAIN_H
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#define PLANMAIN_H
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#include "nodes/plannodes.h"
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#include "nodes/relation.h"
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/* GUC parameters */
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#define DEFAULT_CURSOR_TUPLE_FRACTION 0.1
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extern double cursor_tuple_fraction;
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/*
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* prototypes for plan/planmain.c
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*/
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extern void query_planner(PlannerInfo *root, List *tlist,
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double tuple_fraction, double limit_tuples,
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Path **cheapest_path, Path **sorted_path,
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double *num_groups);
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/*
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* prototypes for plan/planagg.c
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*/
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extern void preprocess_minmax_aggregates(PlannerInfo *root, List *tlist);
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extern Plan *optimize_minmax_aggregates(PlannerInfo *root, List *tlist,
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const AggClauseCosts *aggcosts, Path *best_path);
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/*
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* prototypes for plan/createplan.c
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*/
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extern Plan *create_plan(PlannerInfo *root, Path *best_path);
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extern SubqueryScan *make_subqueryscan(List *qptlist, List *qpqual,
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Index scanrelid, Plan *subplan);
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extern ForeignScan *make_foreignscan(List *qptlist, List *qpqual,
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Index scanrelid, List *fdw_exprs, List *fdw_private);
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extern Append *make_append(List *appendplans, List *tlist);
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extern RecursiveUnion *make_recursive_union(List *tlist,
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Plan *lefttree, Plan *righttree, int wtParam,
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List *distinctList, long numGroups);
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extern Sort *make_sort_from_pathkeys(PlannerInfo *root, Plan *lefttree,
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List *pathkeys, double limit_tuples);
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extern Sort *make_sort_from_sortclauses(PlannerInfo *root, List *sortcls,
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Plan *lefttree);
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extern Sort *make_sort_from_groupcols(PlannerInfo *root, List *groupcls,
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AttrNumber *grpColIdx, Plan *lefttree);
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extern Agg *make_agg(PlannerInfo *root, List *tlist, List *qual,
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AggStrategy aggstrategy, const AggClauseCosts *aggcosts,
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int numGroupCols, AttrNumber *grpColIdx, Oid *grpOperators,
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long numGroups,
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Plan *lefttree);
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extern WindowAgg *make_windowagg(PlannerInfo *root, List *tlist,
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List *windowFuncs, Index winref,
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int partNumCols, AttrNumber *partColIdx, Oid *partOperators,
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int ordNumCols, AttrNumber *ordColIdx, Oid *ordOperators,
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int frameOptions, Node *startOffset, Node *endOffset,
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Plan *lefttree);
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extern Group *make_group(PlannerInfo *root, List *tlist, List *qual,
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int numGroupCols, AttrNumber *grpColIdx, Oid *grpOperators,
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double numGroups,
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Plan *lefttree);
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extern Plan *materialize_finished_plan(Plan *subplan);
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extern Unique *make_unique(Plan *lefttree, List *distinctList);
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extern LockRows *make_lockrows(Plan *lefttree, List *rowMarks, int epqParam);
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extern Limit *make_limit(Plan *lefttree, Node *limitOffset, Node *limitCount,
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int64 offset_est, int64 count_est);
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extern SetOp *make_setop(SetOpCmd cmd, SetOpStrategy strategy, Plan *lefttree,
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List *distinctList, AttrNumber flagColIdx, int firstFlag,
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long numGroups, double outputRows);
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extern Result *make_result(PlannerInfo *root, List *tlist,
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Node *resconstantqual, Plan *subplan);
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extern ModifyTable *make_modifytable(CmdType operation, bool canSetTag,
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List *resultRelations, List *subplans, List *returningLists,
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List *rowMarks, int epqParam);
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extern bool is_projection_capable_plan(Plan *plan);
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/*
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* prototypes for plan/initsplan.c
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*/
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extern int from_collapse_limit;
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extern int join_collapse_limit;
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extern void add_base_rels_to_query(PlannerInfo *root, Node *jtnode);
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extern void build_base_rel_tlists(PlannerInfo *root, List *final_tlist);
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extern void add_vars_to_targetlist(PlannerInfo *root, List *vars,
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Relids where_needed, bool create_new_ph);
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extern void find_lateral_references(PlannerInfo *root);
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extern void create_lateral_join_info(PlannerInfo *root);
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extern List *deconstruct_jointree(PlannerInfo *root);
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extern void distribute_restrictinfo_to_rels(PlannerInfo *root,
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RestrictInfo *restrictinfo);
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extern void process_implied_equality(PlannerInfo *root,
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Oid opno,
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Oid collation,
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Expr *item1,
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Expr *item2,
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Relids qualscope,
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bool below_outer_join,
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bool both_const);
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extern RestrictInfo *build_implied_join_equality(Oid opno,
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Oid collation,
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Expr *item1,
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Expr *item2,
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Relids qualscope);
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/*
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* prototypes for plan/analyzejoins.c
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*/
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extern List *remove_useless_joins(PlannerInfo *root, List *joinlist);
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/*
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* prototypes for plan/setrefs.c
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*/
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extern Plan *set_plan_references(PlannerInfo *root, Plan *plan);
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extern void fix_opfuncids(Node *node);
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extern void set_opfuncid(OpExpr *opexpr);
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extern void set_sa_opfuncid(ScalarArrayOpExpr *opexpr);
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extern void record_plan_function_dependency(PlannerInfo *root, Oid funcid);
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extern void extract_query_dependencies(Node *query,
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List **relationOids,
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List **invalItems);
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#endif /* PLANMAIN_H */
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