SelectWithUnionQuery (children 2)
 ExpressionList (children 1)
  SelectQuery (children 1)
   ExpressionList (children 1)
    Function equals (children 1)
     ExpressionList (children 2)
      Literal NULL
      Function countEqual (children 1)
       ExpressionList (children 2)
        Function materialize (children 1)
         ExpressionList (children 1)
          Function array (children 1)
           ExpressionList (children 4)
            Function arrayJoin (children 1)
             ExpressionList (children 1)
              Literal Array_[NULL, NULL, NULL]
            Literal NULL (alias x)
            Function arrayJoin (children 1)
             ExpressionList (children 1)
              Literal Array_[UInt64_255, UInt64_1025, NULL, NULL]
            Function arrayJoin (children 1)
             ExpressionList (children 1)
              Literal Array_[UInt64_2, UInt64_1048576, NULL, NULL]
        Function materialize (children 1)
         ExpressionList (children 1)
          Identifier x
 Identifier Null