[GitHub] flink pull request #5273: [FLINK-8400] [table] Use the lexicographic smalles...

[hequn8128 <gi...@git.apache.org>]

GitHub user hequn8128 opened a pull request:

    https://github.com/apache/flink/pull/5273

    [FLINK-8400] [table] Use the lexicographic smallest attribute as the common group id when extract unique key

    
    ## What is the purpose of the change
    
    `UniqueKeyExtractor` will return a tuple, the first element is the name of a key field, the second is a group name that is shared by all equivalent key fields. The group names are used to identify same keys, for example: select('pk as pk1, 'pk as pk2), both pk1 and pk2 belong to the same group, i.e., pk1. Here we use the lexicographic smallest attribute as the common group id.
    
    Currently, when extract unique keys from `DataStreamCalc`, the generated group id is not the lexicographic smallest attribute. This pr will fix this bug.
    
    
    ## Brief change log
    
      - Use lexicographic smallest attribute as group id when extract unique key for `DataStreamCalc`
      - Add test to check whether group id is the lexicographic smallest attribute.
    
    
    ## Verifying this change
    
    This change added tests and can be verified as follows:
    
      - Add test to check whether group id is the lexicographic smallest attribute
    
    
    ## Does this pull request potentially affect one of the following parts:
    
      - Dependencies (does it add or upgrade a dependency): (no)
      - The public API, i.e., is any changed class annotated with `@Public(Evolving)`: (no)
      - The serializers: (no )
      - The runtime per-record code paths (performance sensitive): (no)
      - Anything that affects deployment or recovery: JobManager (and its components), Checkpointing, Yarn/Mesos, ZooKeeper: (no)
      - The S3 file system connector: (no)
    
    ## Documentation
    
      - Does this pull request introduce a new feature? (no)


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

    $ git pull https://github.com/hequn8128/flink 6904_groupid

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

    https://github.com/apache/flink/pull/5273.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 #5273
    
----
commit 53716b34ab7a9eab1362b07783a8a64fcc732757
Author: 军长 <he...@...>
Date:   2018-01-10T07:48:19Z

    [FLINK-6094] [table] use the lexicographic smallest attribute as the common group id

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[GitHub] flink pull request #5273: [FLINK-8400] [table] Use the lexicographic smalles...

[asfgit <gi...@git.apache.org>]

Github user asfgit closed the pull request at:

    https://github.com/apache/flink/pull/5273


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