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Support assignment to subfields of composite columns in UPDATE and INSERT.

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As a side effect, cause subscripts in INSERT targetlists to do something
more or less sensible; previously we evaluated such subscripts and then
effectively ignored them.  Another side effect is that UPDATE-ing an
element or slice of an array value that is NULL now produces a non-null
result, namely an array containing just the assigned-to positions.
This commit is contained in:
Tom Lane
2004-06-09 19:08:20 +00:00
parent 3a0df651da
commit 7e64dbc6b5
27 changed files with 1468 additions and 574 deletions
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33
src/backend/optimizer/util/clauses.c
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@@ -8,7 +8,7 @@
*
*
* IDENTIFICATION
* $PostgreSQL: pgsql/src/backend/optimizer/util/clauses.c,v 1.174 2004/06/05 19:48:08 tgl Exp $
* $PostgreSQL: pgsql/src/backend/optimizer/util/clauses.c,v 1.175 2004/06/09 19:08:16 tgl Exp $
*
* HISTORY
* AUTHOR DATE MAJOR EVENT
@@ -724,6 +724,13 @@ contain_nonstrict_functions_walker(Node *node, void *context)
/* an aggregate could return non-null with null input */
return true;
}
if (IsA(node, ArrayRef))
{
/* array assignment is nonstrict */
if (((ArrayRef *) node)->refassgnexpr != NULL)
return true;
/* else fall through to check args */
}
if (IsA(node, FuncExpr))
{
FuncExpr *expr = (FuncExpr *) node;
@@ -771,6 +778,8 @@ contain_nonstrict_functions_walker(Node *node, void *context)
}
if (IsA(node, SubPlan))
return true;
if (IsA(node, FieldStore))
return true;
if (IsA(node, CaseExpr))
return true;
if (IsA(node, CaseWhen))
@@ -2450,6 +2459,16 @@ expression_tree_walker(Node *node,
break;
case T_FieldSelect:
return walker(((FieldSelect *) node)->arg, context);
case T_FieldStore:
{
FieldStore *fstore = (FieldStore *) node;
if (walker(fstore->arg, context))
return true;
if (walker(fstore->newvals, context))
return true;
}
break;
case T_RelabelType:
return walker(((RelabelType *) node)->arg, context);
case T_CaseExpr:
@@ -2840,6 +2859,18 @@ expression_tree_mutator(Node *node,
return (Node *) newnode;
}
break;
case T_FieldStore:
{
FieldStore *fstore = (FieldStore *) node;
FieldStore *newnode;
FLATCOPY(newnode, fstore, FieldStore);
MUTATE(newnode->arg, fstore->arg, Expr *);
MUTATE(newnode->newvals, fstore->newvals, List *);
newnode->fieldnums = list_copy(fstore->fieldnums);
return (Node *) newnode;
}
break;
case T_RelabelType:
{
RelabelType *relabel = (RelabelType *) node;