SelectWithUnionQuery (children 1)
 ExpressionList (children 1)
  SelectQuery (children 1)
   ExpressionList (children 2)
    Function CAST (alias v) (children 1)
     ExpressionList (children 2)
      Function CAST (children 1)
       ExpressionList (children 2)
        Literal \'42\'
        Literal \'LowCardinality(String)\'
      Literal \'Variant(String, UInt64)\'
    Function variantType (children 1)
     ExpressionList (children 1)
      Identifier v
