GitHub user twalthr opened a pull request:

    [FLINK-6909] [types] Fix error message in CsvReader for wrong type class

    ## What is the purpose of the change
    Fixes a minor issue that was reported by a user. See FLINK-6909. 
    ## Brief change log
    Check type before casting.
    ## Verifying this change
    This change is a trivial rework / code cleanup without any test coverage.
    ## 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 FLINK-6909_3

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 #6037
commit eb99dc3402e1f4885c1a8a356af55c1669346d0d
Author: Timo Walther <twalthr@...>
Date:   2018-05-17T15:35:55Z

    [FLINK-6909] [types] Fix error message in CsvReader for wrong type class



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