internal override SqlNode VisitUnion(SqlUnion su)
{
if (su.All)
{
this.IsValid = false;
}
this.IsDistinct = true;
this.AddIdentityMembers(su.GetClrType().GetProperties());
return(su);
}
private static Type GetClrType(SqlNode node)
{
SqlTableValuedFunctionCall call = node as SqlTableValuedFunctionCall;
if (call != null)
{
return(call.RowType.Type);
}
SqlExpression expression = node as SqlExpression;
if (expression != null)
{
if (TypeSystem.IsSequenceType(expression.ClrType))
{
return(TypeSystem.GetElementType(expression.ClrType));
}
return(expression.ClrType);
}
SqlSelect select = node as SqlSelect;
if (select != null)
{
return(select.Selection.ClrType);
}
SqlTable table = node as SqlTable;
if (table != null)
{
return(table.RowType.Type);
}
SqlUnion union = node as SqlUnion;
if (union == null)
{
throw Error.UnexpectedNode(node.NodeType);
}
return(union.GetClrType());
}
