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UPDATE ... SET <col> = DEFAULT

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Rod Taylor
This commit is contained in:
Bruce Momjian
2003-06-25 04:19:24 +00:00
parent a09ccc70dd
commit 53c4f1233f
9 changed files with 90 additions and 49 deletions
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37
src/backend/parser/parse_target.c
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@ -8,7 +8,7 @@
*
*
* IDENTIFICATION
* $Header: /cvsroot/pgsql/src/backend/parser/parse_target.c,v 1.102 2003/05/31 19:03:34 tgl Exp $
* $Header: /cvsroot/pgsql/src/backend/parser/parse_target.c,v 1.103 2003/06/25 04:19:24 momjian Exp $
*
*-------------------------------------------------------------------------
*/
@ -177,19 +177,24 @@ transformTargetList(ParseState *pstate, List *targetlist)
false));
}
}
else if (IsA(res->val, InsertDefault))
else if (IsA(res->val, SetToDefault))
{
InsertDefault *newnode = makeNode(InsertDefault);
/*
* If this is a DEFAULT element, we make a junk entry which
* will get dropped on return to transformInsertStmt().
* If this is a DEFAULT element, we make a standard entry using
* the default for the target expression. rewriteTargetList will
* substitute the columns default for this expression.
*/
p_target = lappend(p_target, newnode);
p_target = lappend(p_target,
makeTargetEntry(makeResdom((AttrNumber) pstate->p_next_resno++,
UNKNOWNOID,
-1,
res->name,
false),
(Expr *) res->val));
}
else
{
/* Everything else but ColumnRef and InsertDefault */
/* Everything else but ColumnRef and SetToDefault */
p_target = lappend(p_target,
transformTargetEntry(pstate,
res->val,
@ -321,9 +326,10 @@ updateTargetListEntry(ParseState *pstate,
int attrno,
List *indirection)
{
Oid type_id = exprType((Node *) tle->expr); /* type of value provided */
Oid type_id; /* type of value provided */
Oid attrtype; /* type of target column */
int32 attrtypmod;
bool isDefault = false;
Resdom *resnode = tle->resdom;
Relation rd = pstate->p_target_relation;
@ -333,6 +339,17 @@ updateTargetListEntry(ParseState *pstate,
attrtype = attnumTypeId(rd, attrno);
attrtypmod = rd->rd_att->attrs[attrno - 1]->atttypmod;
/* The type of the default column is equivalent to that of the column */
if (tle->expr != NULL && IsA(tle->expr, SetToDefault))
{
type_id = attrtype;
isDefault = true;
}
/* Otherwise the expression holds the type */
else
type_id = exprType((Node *) tle->expr);
/*
* If there are subscripts on the target column, prepare an array
* assignment expression. This will generate an array value that the
@ -383,7 +400,7 @@ updateTargetListEntry(ParseState *pstate,
* coercion. But accept InvalidOid, which indicates the source is
* a NULL constant. (XXX is that still true?)
*/
if (type_id != InvalidOid)
if (!isDefault && type_id != InvalidOid)
{
tle->expr = (Expr *)
coerce_to_target_type(pstate,