SelectWithUnionQuery (children 1)
 ExpressionList (children 1)
  SelectQuery (children 1)
   ExpressionList (children 1)
    Function CAST (children 1)
     ExpressionList (children 2)
      Function map (children 1)
       ExpressionList (children 2)
        Literal UInt64_42
        Literal UInt64_42
      Literal \'Variant(Map(UInt64, UInt32), Map(UInt64, Int64))\'
