SelectWithUnionQuery (children 1)
 ExpressionList (children 1)
  SelectQuery (children 1)
   ExpressionList (children 1)
    Function arrayElement (children 1)
     ExpressionList (children 2)
      Function materialize (children 1)
       ExpressionList (children 1)
        Function array (children 1)
         ExpressionList (children 2)
          Literal \'Hello\'
          Function toLowCardinality (children 1)
           ExpressionList (children 1)
            Literal \'world\'
      Literal Int64_-9223372036854775808
