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if the limit were directly applied to it. This does not actually add a LIMIT plan node to the generated subqueries --- that would be useless overhead --- but it does cause the planner to prefer fast- start plans when the limit is small. After an idea from Phil Endecott.
59 lines
1.6 KiB
C
59 lines
1.6 KiB
C
/*-------------------------------------------------------------------------
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*
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* prep.h
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* prototypes for files in optimizer/prep/
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*
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*
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* Portions Copyright (c) 1996-2005, 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/prep.h,v 1.51 2005/06/10 02:21:05 tgl Exp $
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*
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*-------------------------------------------------------------------------
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*/
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#ifndef PREP_H
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#define PREP_H
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#include "nodes/plannodes.h"
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#include "nodes/relation.h"
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/*
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* prototypes for prepjointree.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 Node *pull_up_IN_clauses(PlannerInfo *root, Node *node);
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extern Node *pull_up_subqueries(PlannerInfo *root, Node *jtnode,
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bool below_outer_join);
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extern void reduce_outer_joins(PlannerInfo *root);
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extern Node *simplify_jointree(PlannerInfo *root, Node *jtnode);
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extern Relids get_relids_in_jointree(Node *jtnode);
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extern Relids get_relids_for_join(PlannerInfo *root, int joinrelid);
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/*
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* prototypes for prepqual.c
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*/
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extern Expr *canonicalize_qual(Expr *qual);
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/*
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* prototypes for preptlist.c
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*/
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extern List *preprocess_targetlist(PlannerInfo *root, List *tlist);
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/*
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* prototypes for prepunion.c
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*/
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extern Plan *plan_set_operations(PlannerInfo *root, double tuple_fraction,
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List **sortClauses);
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extern List *find_all_inheritors(Oid parentrel);
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extern List *expand_inherited_rtentry(PlannerInfo *root, Index rti);
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extern Node *adjust_inherited_attrs(Node *node,
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Index old_rt_index, Oid old_relid,
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Index new_rt_index, Oid new_relid);
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#endif /* PREP_H */
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