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 toDateTime (children 1)
           ExpressionList (children 1)
            Literal \'2015-08-18 00:00:00\'
          Function toDate32 (children 1)
           ExpressionList (children 1)
            Literal \'2015-08-19\'
        Function timeDiff (children 1)
         ExpressionList (children 2)
          Function toDateTime (children 1)
           ExpressionList (children 1)
            Literal \'2015-08-18 00:00:00\'
          Function toDate32 (children 1)
           ExpressionList (children 1)
            Literal \'2015-08-19\'
      Literal UInt64_2