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When expanding a whole-row Var into a RowExpr during ResolveNew(), attach

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the column alias names of the RTE referenced by the Var to the RowExpr.
This is needed to allow ruleutils.c to correctly deparse FieldSelect nodes
referencing such a construct.  Per my recent bug report.

Adding a field to RowExpr forces initdb (because of stored rules changes)
so this solution is not back-patchable; which is unfortunate because 8.2
and 8.3 have this issue.  But it only affects EXPLAIN for some pretty odd
corner cases, so we can probably live without a solution for the back
branches.
This commit is contained in:
Tom Lane
2008-10-06 17:39:26 +00:00
parent e64bb65aff
commit bf461538e1
13 changed files with 49 additions and 16 deletions
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5
src/backend/nodes/nodeFuncs.c
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@ -8,7 +8,7 @@
*
*
* IDENTIFICATION
* $PostgreSQL: pgsql/src/backend/nodes/nodeFuncs.c,v 1.33 2008/10/04 21:56:53 tgl Exp $
* $PostgreSQL: pgsql/src/backend/nodes/nodeFuncs.c,v 1.34 2008/10/06 17:39:26 tgl Exp $
*
*-------------------------------------------------------------------------
*/
@ -1172,6 +1172,7 @@ expression_tree_walker(Node *node,
case T_ArrayExpr:
return walker(((ArrayExpr *) node)->elements, context);
case T_RowExpr:
/* Assume colnames isn't interesting */
return walker(((RowExpr *) node)->args, context);
case T_RowCompareExpr:
{
@ -1735,6 +1736,7 @@ expression_tree_mutator(Node *node,
FLATCOPY(newnode, rowexpr, RowExpr);
MUTATE(newnode->args, rowexpr->args, List *);
/* Assume colnames needn't be duplicated */
return (Node *) newnode;
}
break;
@ -2174,6 +2176,7 @@ raw_expression_tree_walker(Node *node, bool (*walker) (), void *context)
}
break;
case T_RowExpr:
/* Assume colnames isn't interesting */
return walker(((RowExpr *) node)->args, context);
case T_CoalesceExpr:
return walker(((CoalesceExpr *) node)->args, context);