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From sunjincheng121 <...@git.apache.org>
Subject [GitHub] flink pull request #4200: [FLINK-7014] Expose isDeterministic interface to S...
Date Wed, 28 Jun 2017 02:29:27 GMT
Github user sunjincheng121 commented on a diff in the pull request:

    --- Diff: flink-libraries/flink-table/src/main/scala/org/apache/flink/table/functions/UserDefinedFunction.scala
    @@ -40,6 +40,12 @@ abstract class UserDefinedFunction extends Serializable {
       def close(): Unit = {}
    +  /**
    +    * @return true iff a call to this function is guaranteed to always return
    +    *         the same result given the same parameters; true is assumed by default
    +    */
    +  def isDeterministic: Boolean = true
    --- End diff --
    I suggest explain when user need to overwrite the method, what the impact if not overwrite
the method. 

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