GitHub user jelmerk opened a pull request:

    [FLINK-8828] [stream, dataset, scala] Introduce collect method

    ## What is the purpose of the change
    A collect function is a method that takes a Partial Function as its 
parameter and applies it to all the elements in the collection to create a new 
collection which satisfies the Partial Function. It makes certain things nicer 
to express 
    ## Brief change log
    - added collect method on scala dataset and datastream api
    ## Verifying this change
    It seems to be hard to find a place where this could be tested in 
isolation, suggestions welcome
    ## 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)`: yes
      - The serializers: don't know
      - The runtime per-record code paths (performance sensitive): yes
      - Anything that affects deployment or recovery: JobManager (and its 
components), Checkpointing, Yarn/Mesos, ZooKeeper:don't know
      - The S3 file system connector: no
    ## Documentation
      - Does this pull request introduce a new feature? yes
      - If yes, how is the feature documented? JavaDocs

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

    $ git pull collect_support

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

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

    This closes #5616
commit 61b4bcb7c941950d62d0db0aa2041f1796fdbaaf
Author: Jelmer Kuperus <jkuperus@...>
Date:   2018-03-02T09:17:54Z

    [FLINK-8828] [stream, dataset, scala] Introduce collect method



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