SelectWithUnionQuery (children 1)
 ExpressionList (children 1)
  SelectQuery (children 1)
   ExpressionList (children 1)
    Function anyIf (children 1)
     ExpressionList (children 2)
      Literal \'Hello\'
      Function isNull (children 1)
       ExpressionList (children 1)
        Function arrayJoin (children 1)
         ExpressionList (children 1)
          Literal Array_[UInt64_1, NULL]