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)
        Literal Tuple_(UInt64_1, \'Hello\')
        Literal Tuple_(UInt64_2, \'World\')
      Literal \'Array(Tuple(a UInt64, b String))\'
