GitHub user sunjincheng121 opened a pull request:

    https://github.com/apache/flink/pull/3786

    [FLINK-6392][table] Change the alias of Window from optional to essen…

    In this PR refactoring the API definition using TYPE SYSTEM lead to 
constraint for the alias.
    - [x] General
      - The pull request references the related JIRA issue 
("[FLINK-6392][table] Change the alias of Window from optional to essential.")
      - The pull request addresses only one issue
      - Each commit in the PR has a meaningful commit message (including the 
JIRA id)
    
    - [ ] Documentation
      - Documentation has been added for new functionality
      - Old documentation affected by the pull request has been updated
      - JavaDoc for public methods has been added
    
    - [x] Tests & Build
      - Functionality added by the pull request is covered by tests
      - `mvn clean verify` has been executed successfully locally or a Travis 
build has passed


You can merge this pull request into a Git repository by running:

    $ git pull https://github.com/sunjincheng121/flink FLINK-6392-PR

Alternatively you can review and apply these changes as the patch at:

    https://github.com/apache/flink/pull/3786.patch

To close this pull request, make a commit to your master/trunk branch
with (at least) the following in the commit message:

    This closes #3786
    
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commit a9a2c0e8473da287cb5f77ba48ed9d5048e6a3a7
Author: sunjincheng121 <sunjincheng...@gmail.com>
Date:   2017-04-27T01:58:18Z

    [FLINK-6392][table] Change the alias of Window from optional to essential.

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