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We can't handle this in the general case due to limitations of the planner's data representations; but we can allow it in many useful cases, by being careful to flatten only when we are pulling a single-row subquery up into a FROM (or, equivalently, inner JOIN) node that will still have at least one remaining relation child. Per discussion of an example from Kyotaro Horiguchi.
64 lines
1.7 KiB
C
64 lines
1.7 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) 1996-2015, 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/prep.h
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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 void pull_up_sublinks(PlannerInfo *root);
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extern void inline_set_returning_functions(PlannerInfo *root);
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extern void pull_up_subqueries(PlannerInfo *root);
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extern void flatten_simple_union_all(PlannerInfo *root);
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extern void reduce_outer_joins(PlannerInfo *root);
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extern Relids get_relids_in_jointree(Node *jtnode, bool include_joins);
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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 Node *negate_clause(Node *node);
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extern Expr *canonicalize_qual(Expr *qual);
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/*
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* prototypes for prepsecurity.c
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*/
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extern void expand_security_quals(PlannerInfo *root, List *tlist);
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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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extern PlanRowMark *get_plan_rowmark(List *rowmarks, Index rtindex);
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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 void expand_inherited_tables(PlannerInfo *root);
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extern Node *adjust_appendrel_attrs(PlannerInfo *root, Node *node,
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AppendRelInfo *appinfo);
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extern Node *adjust_appendrel_attrs_multilevel(PlannerInfo *root, Node *node,
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RelOptInfo *child_rel);
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#endif /* PREP_H */
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