SelectWithUnionQuery (children 1)
 ExpressionList (children 1)
  SelectQuery (children 1)
   ExpressionList (children 1)
    Function arrayMap (children 1)
     ExpressionList (children 2)
      Function lambda (children 1)
       ExpressionList (children 2)
        Function tuple (children 1)
         ExpressionList (children 1)
          Identifier x
        Function concat (children 1)
         ExpressionList (children 3)
          Identifier x
          Function concat (children 1)
           ExpressionList (children 3)
            Function arrayJoin (children 1)
             ExpressionList (children 1)
              Literal Array_[UInt64_1]
            Identifier x
            Literal NULL
          Literal \'\'
      Literal Array_[UInt64_1]