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