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From sunjincheng121 <...@git.apache.org>
Subject [GitHub] flink pull request #4055: [FLINK-6817] [table] Fix NPE when preceding is not...
Date Fri, 02 Jun 2017 16:22:09 GMT
Github user sunjincheng121 commented on a diff in the pull request:

    --- 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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