SelectWithUnionQuery (children 1)
 ExpressionList (children 1)
  SelectQuery (children 1)
   ExpressionList (children 1)
    Function lessOrEquals (children 1)
     ExpressionList (children 2)
      Function timeDiff (children 1)
       ExpressionList (children 2)
        Function UTCTimestamp (children 1)
         ExpressionList
        Function now (children 1)
         ExpressionList (children 1)
          Literal \'UTC\'
      Literal UInt64_2