private InputFragment WrapJoinInputIfNecessary(InputFragment fragment, bool isRightPart)
{
if (fragment is SelectStatement || fragment is UnionFragment)
{
fragment.Wrap(scope);
fragment.Scoped = true;
}
else if (fragment is JoinFragment && isRightPart)
{
SelectStatement select = new SelectStatement();
select.From = fragment;
select.Name = fragment.Name;
select.Wrap(scope);
return select;
}
return fragment;
}
public SelectStatement WrapIfNotCompatible(SelectStatement select, DbExpressionKind expressionKind)
{
if (select.IsCompatible(expressionKind)) return select;
SelectStatement newSelect = new SelectStatement();
select.Wrap(scope);
select.Scoped = true;
newSelect.From = select;
return newSelect;
}
private SelectStatement VisitInputExpressionEnsureSelect(DbExpression e, string name, TypeUsage type)
{
InputFragment fragment = VisitInputExpression(e, name, type);
if (fragment is SelectStatement) return (fragment as SelectStatement);
SelectStatement s = new SelectStatement();
// if the fragment is a union then it needs to be wrapped
if (fragment is UnionFragment)
(fragment as UnionFragment).Wrap(scope);
s.From = fragment;
return s;
}
public override SqlFragment Visit(DbNewInstanceExpression expression)
{
Debug.Assert(expression.ResultType.EdmType is CollectionType);
SelectStatement s = new SelectStatement();
ColumnFragment c = new ColumnFragment(null, null);
if (expression.Arguments.Count != 0)
c.Literal = (LiteralFragment)expression.Arguments[0].Accept(this);
else
c.Literal = new LiteralFragment("NULL");
c.ColumnAlias = "X";
s.Columns.Add(c);
return s;
}