GitHub user youngoli opened a pull request:
https://github.com/apache/beam/pull/3922
[BEAM-2989] Fixed error when using Void type in WithKeys.
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---
`WithKeys` had trouble correctly getting a `VoidCoder` when called with a
null input before. This fix makes it so that it now functions when the input is
`(Void) null`. This is done by passing Void.class as the key's class type
instead of null, if the inputted key was null. Note that a null input that
isn't cast to Void calls the `WithKeys.of` taking a `SerializableFunction`
instead, so I added a precondition with a warning message to that one.
Also added a unit test to confirm that the fix works as intended, a quick
change to `VoidCoder` to ensure that it doesn't get used inappropriately, and
fixed a few warnings in `WithKeysTest`.
You can merge this pull request into a Git repository by running:
$ git pull https://github.com/youngoli/beam bug-2989
Alternatively you can review and apply these changes as the patch at:
https://github.com/apache/beam/pull/3922.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 #3922
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commit 97fa1f0e10f0cdfb4c6dff54e39230da41478d19
Author: Daniel Oliveira <daniel.o.program...@gmail.com>
Date: 2017-09-29T21:10:00Z
[BEAM-2989] Fixed error when using Void type in WithKeys.
Also added error messages to WithKeys.of and VoidCoder.encode.
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