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Use a bitmapset instead of a list for duplicate-column checking in

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checkInsertTargets().  Avoids O(N^2) behavior on wide target lists.
This commit is contained in:
Tom Lane 2005-03-26 06:28:59 +00:00
parent 9e5238137d
commit bb34970f91
1 changed files with 9 additions and 5 deletions
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14
src/backend/parser/parse_target.c
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@ -8,7 +8,7 @@
*
*
* IDENTIFICATION
* $PostgreSQL: pgsql/src/backend/parser/parse_target.c,v 1.129 2005/01/13 17:19:09 tgl Exp $
* $PostgreSQL: pgsql/src/backend/parser/parse_target.c,v 1.130 2005/03/26 06:28:59 tgl Exp $
*
*-------------------------------------------------------------------------
*/
@ -16,6 +16,7 @@
#include "commands/dbcommands.h"
#include "miscadmin.h"
#include "nodes/bitmapset.h"
#include "nodes/makefuncs.h"
#include "parser/parsetree.h"
#include "parser/parse_coerce.h"
@ -630,7 +631,8 @@ checkInsertTargets(ParseState *pstate, List *cols, List **attrnos)
/*
* Do initial validation of user-supplied INSERT column list.
*/
List *wholecols = NIL;
Bitmapset *wholecols = NULL;
Bitmapset *partialcols = NULL;
ListCell *tl;
foreach(tl, cols)
@ -649,21 +651,23 @@ checkInsertTargets(ParseState *pstate, List *cols, List **attrnos)
if (col->indirection == NIL)
{
/* whole column; must not have any other assignment */
if (list_member_int(*attrnos, attrno))
if (bms_is_member(attrno, wholecols) ||
bms_is_member(attrno, partialcols))
ereport(ERROR,
(errcode(ERRCODE_DUPLICATE_COLUMN),
errmsg("column \"%s\" specified more than once",
name)));
wholecols = lappend_int(wholecols, attrno);
wholecols = bms_add_member(wholecols, attrno);
}
else
{
/* partial column; must not have any whole assignment */
if (list_member_int(wholecols, attrno))
if (bms_is_member(attrno, wholecols))
ereport(ERROR,
(errcode(ERRCODE_DUPLICATE_COLUMN),
errmsg("column \"%s\" specified more than once",
name)));
partialcols = bms_add_member(partialcols, attrno);
}
*attrnos = lappend_int(*attrnos, attrno);