GitHub user gczsjdy opened a pull request:

    [CORE] Better scala version check

    ## What changes were proposed in this pull request?
    In some cases when outer project use pre-built Spark as dependency, 
`getScalaVersion` will fail due to `launcher` directory doesn't exist. This PR 
also checks in `jars` directory.
    ## How was this patch tested?
    Existing tests.

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

    $ git pull scala_version_check

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 #20809
commit 49c6198e9bfd2de986ca2bb9d7fc153f1b4c6be0
Author: GuoChenzhao <chenzhao.guo@...>
Date:   2018-03-13T08:13:04Z

    Better scala version check



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