GitHub user kennknowles opened a pull request:
https://github.com/apache/incubator-beam/pull/452
Fix PAssert with empty collections
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This branch attempts to fix this in a fairly canonical way, by actually
inserting an empty iterable when the `PCollection` is empty and thus cannot be
gathered via GBK.
You can merge this pull request into a Git repository by running:
$ git pull https://github.com/kennknowles/incubator-beam PAssert-empty
Alternatively you can review and apply these changes as the patch at:
https://github.com/apache/incubator-beam/pull/452.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 #452
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commit 089d8ae24a65da5a83012076ea50bb191c5b2740
Author: Kenneth Knowles <k...@google.com>
Date: 2016-06-13T21:28:57Z
Fix PAssert with empty collections
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