Github user vasia commented on the pull request:
https://github.com/apache/flink/pull/1880#issuecomment-209921610
Hey @twalthr, thanks for the PR!
One comment is that we need to update the docs about the null literal and
how to configure the null check. Second, I don't really understand the behavior
when the null check is not set. We return some default values, but how were
these decided?
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