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into a UNION that has some type coercions applied to the component queries, so long as the qual itself does not reference any columns that have such coercions. Per example from Jonathan Bartlett 24-Apr-03.
63 lines
1.7 KiB
C
63 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) 1996-2002, 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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* $Id: prep.h,v 1.39 2003/04/24 23:43:09 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/parsenodes.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(Query *parse, Node *node);
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extern Node *pull_up_subqueries(Query *parse, Node *jtnode,
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bool below_outer_join);
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extern void reduce_outer_joins(Query *parse);
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extern Node *simplify_jointree(Query *parse, Node *jtnode);
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extern Relids get_relids_in_jointree(Node *jtnode);
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extern Relids get_relids_for_join(Query *parse, int joinrelid);
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/*
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* prototypes for prepqual.c
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*/
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extern List *canonicalize_qual(Expr *qual, bool removeAndFlag);
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extern List *cnfify(Expr *qual, bool removeAndFlag);
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/*
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* prototypes for preptlist.c
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*/
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extern List *preprocess_targetlist(List *tlist, int command_type,
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Index result_relation, List *range_table);
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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(Query *parse);
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extern List *find_all_inheritors(Oid parentrel);
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extern List *expand_inherited_rtentry(Query *parse, Index rti,
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bool dup_parent);
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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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