GitHub user gengliangwang opened a pull request:
https://github.com/apache/spark/pull/22553
[SPARK-25541][SQL] CaseInsensitiveMap should be serializable after '-' or
'filterKeys'
## What changes were proposed in this pull request?
`CaseInsensitiveMap` is declared as Serializable. However, it is no
serializable after `-` operator or `filterKeys` method.
This PR fix the issue by overriding the operator `-` and method
`filterKeys`. So the we can avoid potential `NotSerializableException` on using
`CaseInsensitiveMap`.
## How was this patch tested?
New test suite.
You can merge this pull request into a Git repository by running:
$ git pull https://github.com/gengliangwang/spark fixCaseInsensitiveMap
Alternatively you can review and apply these changes as the patch at:
https://github.com/apache/spark/pull/22553.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 #22553
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commit 54ace1541a8db2e49daeda6b5573193527a95f24
Author: Gengliang Wang <gengliang.wang@...>
Date: 2018-09-26T06:36:53Z
fix and add test suite
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