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 Array_[\'Hello\']
          Function array (children 1)
           ExpressionList (children 1)
            Function toNullable (children 1)
             ExpressionList (children 1)
              Literal \'world\'
      Literal Int64_-9223372036854775808
