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Fix inherited UPDATE for cases where child column numbering doesn't

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match parent table.  This used to work, but was broken in 7.3 by
rearrangement of code that handles targetlist sorting.  Add a regression
test to catch future breakage.
This commit is contained in:
Tom Lane 2003-01-05 00:56:56 +00:00
parent f159bce09f
commit 2e0e101b42
1 changed files with 109 additions and 3 deletions
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112
src/backend/optimizer/prep/prepunion.c
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@ -14,7 +14,7 @@
*
*
* IDENTIFICATION
* $Header: /cvsroot/pgsql/src/backend/optimizer/prep/prepunion.c,v 1.80 2002/09/18 21:35:21 tgl Exp $
* $Header: /cvsroot/pgsql/src/backend/optimizer/prep/prepunion.c,v 1.80.2.1 2003/01/05 00:56:56 tgl Exp $
*
*-------------------------------------------------------------------------
*/
@ -67,6 +67,7 @@ static List *generate_append_tlist(List *colTypes, bool flag,
List *refnames_tlist);
static Node *adjust_inherited_attrs_mutator(Node *node,
adjust_inherited_attrs_context *context);
static List *adjust_inherited_tlist(List *tlist, Oid new_relid);
/*
@ -770,10 +771,17 @@ adjust_inherited_attrs(Node *node,
Query *newnode;
FLATCOPY(newnode, query, Query);
if (newnode->resultRelation == old_rt_index)
newnode->resultRelation = new_rt_index;
query_tree_mutator(newnode, adjust_inherited_attrs_mutator,
(void *) &context, QTW_IGNORE_SUBQUERIES);
if (newnode->resultRelation == old_rt_index)
{
newnode->resultRelation = new_rt_index;
/* Fix tlist resnos too, if it's inherited UPDATE */
if (newnode->commandType == CMD_UPDATE)
newnode->targetList =
adjust_inherited_tlist(newnode->targetList,
new_relid);
}
return (Node *) newnode;
}
else
@ -889,3 +897,101 @@ adjust_inherited_attrs_mutator(Node *node,
return expression_tree_mutator(node, adjust_inherited_attrs_mutator,
(void *) context);
}
/*
* Adjust the targetlist entries of an inherited UPDATE operation
*
* The expressions have already been fixed, but we have to make sure that
* the target resnos match the child table (they may not, in the case of
* a column that was added after-the-fact by ALTER TABLE). In some cases
* this can force us to re-order the tlist to preserve resno ordering.
* (We do all this work in special cases so that preptlist.c is fast for
* the typical case.)
*
* The given tlist has already been through expression_tree_mutator;
* therefore the TargetEntry nodes are fresh copies that it's okay to
* scribble on. But the Resdom nodes have not been copied; make new ones
* if we need to change them!
*
* Note that this is not needed for INSERT because INSERT isn't inheritable.
*/
static List *
adjust_inherited_tlist(List *tlist, Oid new_relid)
{
bool changed_it = false;
List *tl;
List *new_tlist;
bool more;
int attrno;
/* Scan tlist and update resnos to match attnums of new_relid */
foreach(tl, tlist)
{
TargetEntry *tle = (TargetEntry *) lfirst(tl);
Resdom *resdom = tle->resdom;
if (resdom->resjunk)
continue; /* ignore junk items */
attrno = get_attnum(new_relid, resdom->resname);
if (attrno == InvalidAttrNumber)
elog(ERROR, "Relation \"%s\" has no column \"%s\"",
get_rel_name(new_relid), resdom->resname);
if (resdom->resno != attrno)
{
resdom = (Resdom *) copyObject((Node *) resdom);
resdom->resno = attrno;
tle->resdom = resdom;
changed_it = true;
}
}
/*
* If we changed anything, re-sort the tlist by resno, and make sure
* resjunk entries have resnos above the last real resno. The sort
* algorithm is a bit stupid, but for such a seldom-taken path, small
* is probably better than fast.
*/
if (!changed_it)
return tlist;
new_tlist = NIL;
more = true;
for (attrno = 1; more; attrno++)
{
more = false;
foreach(tl, tlist)
{
TargetEntry *tle = (TargetEntry *) lfirst(tl);
Resdom *resdom = tle->resdom;
if (resdom->resjunk)
continue; /* ignore junk items */
if (resdom->resno == attrno)
new_tlist = lappend(new_tlist, tle);
else if (resdom->resno > attrno)
more = true;
}
}
foreach(tl, tlist)
{
TargetEntry *tle = (TargetEntry *) lfirst(tl);
Resdom *resdom = tle->resdom;
if (!resdom->resjunk)
continue; /* here, ignore non-junk items */
if (resdom->resno != attrno)
{
resdom = (Resdom *) copyObject((Node *) resdom);
resdom->resno = attrno;
tle->resdom = resdom;
}
new_tlist = lappend(new_tlist, tle);
attrno++;
}
return new_tlist;
}