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dd979f66be
SELECT DISTINCT ON (expr [, expr ...]) targetlist ... and there is a check to make sure that the user didn't specify an ORDER BY that's incompatible with the DISTINCT operation. Reimplement nodeUnique and nodeGroup to use the proper datatype-specific equality function for each column being compared --- they used to do bitwise comparisons or convert the data to text strings and strcmp(). (To add insult to injury, they'd look up the conversion functions once for each tuple...) Parse/plan representation of DISTINCT is now a list of SortClause nodes. initdb forced by querytree change...
60 lines
1.8 KiB
C
60 lines
1.8 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) 1996-2000, PostgreSQL, Inc
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* Portions Copyright (c) 1994, Regents of the University of California
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*
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* $Id: planmain.h,v 1.37 2000/01/27 18:11:45 tgl Exp $
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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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/*
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* prototypes for plan/planmain.c
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*/
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extern Plan *query_planner(Query *root, List *tlist, List *qual);
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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(Query *root, Path *best_path);
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extern SeqScan *make_seqscan(List *qptlist, List *qpqual, Index scanrelid);
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extern Sort *make_sort(List *tlist, Oid nonameid, Plan *lefttree,
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int keycount);
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extern Agg *make_agg(List *tlist, Plan *lefttree);
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extern Group *make_group(List *tlist, bool tuplePerGroup, int ngrp,
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AttrNumber *grpColIdx, Plan *lefttree);
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extern Noname *make_noname(List *tlist, List *pathkeys, Plan *subplan);
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extern Unique *make_unique(List *tlist, Plan *lefttree, List *distinctList);
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extern Result *make_result(List *tlist, Node *resconstantqual, Plan *subplan);
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/*
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* prototypes for plan/initsplan.c
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*/
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extern void make_var_only_tlist(Query *root, List *tlist);
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extern void add_restrict_and_join_to_rels(Query *root, List *clauses);
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extern void add_missing_rels_to_query(Query *root);
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/*
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* prototypes for plan/setrefs.c
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*/
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extern void set_plan_references(Plan *plan);
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extern List *join_references(List *clauses, List *outer_tlist,
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List *inner_tlist, Index acceptable_rel);
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extern void fix_opids(Node *node);
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/*
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* prep/prepkeyset.c
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*/
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extern void transformKeySetQuery(Query *origNode);
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#endif /* PLANMAIN_H */
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