[GitHub] flink pull request #6003: [FLINK-9289] Parallelism of generated operators sh...

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

GitHub user xccui opened a pull request:

    https://github.com/apache/flink/pull/6003

    [FLINK-9289] Parallelism of generated operators should have max parallelism of input

    ## What is the purpose of the change
    
    This PR aims to fix the default parallelism problem for the generated key-extraction mapper whose input is a union operator without parallelism in the batch environment.
    
    ## Brief change log
    
      - When creating a `Union` operator, automatically set its parallelism to the maximum one of its inputs.
      - Forbid the user to set parallelism for the union operator manually.
      - Add some test cases in `UnionOperatorTest.java` and `UnionTranslationTest.java`.
      - Adjust the results for `testUnionWithoutExtended()` and `testUnionWithExtended()` in `org.apache.flink.table.api.batch.ExplainTest`.
      - Remove the parallelism setting code for union in `PythonPlanBinder.java` and `PageRank.java`.
    
    ## Verifying this change
    
    The change can be verified by the added test cases in `UnionOperatorTest.java` and `UnionTranslationTest.java`.
    
    ## 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)
      - If yes, how is the feature documented? (not applicable)


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

    $ git pull https://github.com/xccui/flink FLINK-9289-parallelism

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

    https://github.com/apache/flink/pull/6003.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 #6003
    
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commit 35be0811ef0a5e6c572d0a60160fa18c3b6afefa
Author: Xingcan Cui <xi...@...>
Date:   2018-05-13T12:20:36Z

    [FLINK-9289] Parallelism of generated operators should have max parallism of input

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