SelectWithUnionQuery (children 1)
 ExpressionList (children 1)
  SelectQuery (children 1)
   ExpressionList (children 1)
    Function lessOrEquals (children 1)
     ExpressionList (children 2)
      Function minus (children 1)
       ExpressionList (children 2)
        Function dateDiff (children 1)
         ExpressionList (children 3)
          Literal \'second\'
          Function toDate32 (children 1)
           ExpressionList (children 1)
            Literal \'2015-08-18\'
          Function toDateTime (children 1)
           ExpressionList (children 1)
            Literal \'2015-08-19 00:00:00\'
        Function timeDiff (children 1)
         ExpressionList (children 2)
          Function toDate32 (children 1)
           ExpressionList (children 1)
            Literal \'2015-08-18\'
          Function toDateTime (children 1)
           ExpressionList (children 1)
            Literal \'2015-08-19 00:00:00\'
      Literal UInt64_2
