Github user srowen commented on the pull request:
https://github.com/apache/spark/pull/592#issuecomment-41827994
No Apache does not take over copyright in contributions, IIUC. Contributors
own their contributions. In this case, was this code 'contributed' by the owner
(Douban?) to begin with? or just added to the code base? If the latter, it can
still be reused, if the license is compatible (and it looks so) but if the
author didn't specifically agree to license differently, you can't decide that
for them. Leave the license unless it's clear that this was contributed by the
copyright owner under AL2.
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