mirror of
https://github.com/postgres/postgres.git
synced 2025-04-22 23:02:54 +03:00
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...
34 lines
1.1 KiB
C
34 lines
1.1 KiB
C
/*-------------------------------------------------------------------------
|
|
*
|
|
* parse_clause.h
|
|
*
|
|
*
|
|
*
|
|
* Portions Copyright (c) 1996-2000, PostgreSQL, Inc
|
|
* Portions Copyright (c) 1994, Regents of the University of California
|
|
*
|
|
* $Id: parse_clause.h,v 1.15 2000/01/27 18:11:47 tgl Exp $
|
|
*
|
|
*-------------------------------------------------------------------------
|
|
*/
|
|
#ifndef PARSE_CLAUSE_H
|
|
#define PARSE_CLAUSE_H
|
|
|
|
#include "parser/parse_node.h"
|
|
|
|
extern void makeRangeTable(ParseState *pstate, List *frmList, Node **qual);
|
|
extern void setTargetTable(ParseState *pstate, char *relname);
|
|
extern Node *transformWhereClause(ParseState *pstate, Node *where,
|
|
Node *using);
|
|
extern List *transformGroupClause(ParseState *pstate, List *grouplist,
|
|
List *targetlist);
|
|
extern List *transformSortClause(ParseState *pstate, List *orderlist,
|
|
List *targetlist);
|
|
extern List *transformDistinctClause(ParseState *pstate, List *distinctlist,
|
|
List *targetlist, List **sortClause);
|
|
|
|
extern List *addAllTargetsToSortList(List *sortlist, List *targetlist);
|
|
extern Index assignSortGroupRef(TargetEntry *tle, List *tlist);
|
|
|
|
#endif /* PARSE_CLAUSE_H */
|