SelectWithUnionQuery (children 1)
 ExpressionList (children 1)
  SelectQuery (children 1)
   ExpressionList (children 1)
    Function CAST (children 1)
     ExpressionList (children 2)
      Function array (children 1)
       ExpressionList (children 2)
        Function CAST (children 1)
         ExpressionList (children 2)
          Literal \'[1, 2]\'
          Literal \'Array(UInt32)\'
        Literal Array_[UInt64_3]
      Literal \'Array(Array(UInt64))\'
