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Code cleanup inspired by recent resname bug report (doesn't fix the bug

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yet, though).  Avoid using nth() to fetch tlist entries; provide a
common routine get_tle_by_resno() to search a tlist for a particular
resno.  This replaces a couple uses of nth() and a dozen hand-coded
search loops.  Also, replace a few uses of nth(length-1, list) with
llast().
This commit is contained in:
Tom Lane
2003-08-11 20:46:47 +00:00
parent cae912d05b
commit 88381ade63
12 changed files with 161 additions and 316 deletions
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29
src/backend/commands/explain.c
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@ -7,7 +7,7 @@
* Portions Copyright (c) 1994-5, Regents of the University of California
*
* IDENTIFICATION
* $Header: /cvsroot/pgsql/src/backend/commands/explain.c,v 1.114 2003/08/08 21:41:30 momjian Exp $
* $Header: /cvsroot/pgsql/src/backend/commands/explain.c,v 1.115 2003/08/11 20:46:46 tgl Exp $
*
*-------------------------------------------------------------------------
*/
@ -947,7 +947,6 @@ show_sort_keys(List *tlist, int nkeys, AttrNumber *keycols,
List *context;
bool useprefix;
int keyno;
List *tl;
char *exprstr;
Relids varnos;
int i;
@ -993,25 +992,17 @@ show_sort_keys(List *tlist, int nkeys, AttrNumber *keycols,
{
/* find key expression in tlist */
AttrNumber keyresno = keycols[keyno];
TargetEntry *target = get_tle_by_resno(tlist, keyresno);
foreach(tl, tlist)
{
TargetEntry *target = (TargetEntry *) lfirst(tl);
if (target->resdom->resno == keyresno)
{
/* Deparse the expression, showing any top-level cast */
exprstr = deparse_expression((Node *) target->expr, context,
useprefix, true);
/* And add to str */
if (keyno > 0)
appendStringInfo(str, ", ");
appendStringInfo(str, "%s", exprstr);
break;
}
}
if (tl == NIL)
if (!target)
elog(ERROR, "no tlist entry for key %d", keyresno);
/* Deparse the expression, showing any top-level cast */
exprstr = deparse_expression((Node *) target->expr, context,
useprefix, true);
/* And add to str */
if (keyno > 0)
appendStringInfo(str, ", ");
appendStringInfo(str, "%s", exprstr);
}
appendStringInfo(str, "\n");