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From: sunjincheng121 <git@git.apache.org>
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Subject: [GitHub] flink pull request #4055: [FLINK-6817] [table] Fix NPE when preceding is not...
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Message-Id: <20170602162209.33926DFB92@git1-us-west.apache.org>
Date: Fri,  2 Jun 2017 16:22:09 +0000 (UTC)
archived-at: Fri, 02 Jun 2017 16:22:14 -0000

Github user sunjincheng121 commented on a diff in the pull request:

    https://github.com/apache/flink/pull/4055#discussion_r119896926
  
    --- Diff: flink-libraries/flink-table/src/main/scala/org/apache/flink/table/api/windows.scala ---
    @@ -91,6 +91,10 @@ class OverWindowWithOrderBy(
         */
       def as(alias: Expression): OverWindow = {
     
    +    if (null == preceding) {
    --- End diff --
    
    For the strict system type, I recommend adding the `OverWindowWithPreceding` class to guide the user to do the correct operation.


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