SelectWithUnionQuery (children 1)
 ExpressionList (children 1)
  SelectQuery (children 1)
   ExpressionList (children 1)
    Function firstNonDefault (alias result) (children 1)
     ExpressionList (children 4)
      Literal NULL
      Literal UInt64_0
      Literal UInt64_43
      Literal UInt64_256
