Github user asfgit closed the pull request at:
https://github.com/apache/beam/pull/2017
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GitHub user yk5 opened a pull request:
https://github.com/apache/beam/pull/2017
[BEAM-1410] python-sdk: add stacked WindowedValues in DirectRunner.Bundle.
It saves memory for the typical cases that timestamp/window info is shared.
This is on by default, but could be turned o