Github user aljoscha commented on the pull request:
https://github.com/apache/flink/pull/1802#issuecomment-205302445
I did the changes, I introduced `canMerge()` and added a default
`onMerge()` that throws a `RuntimeExeption` in `Trigger`. This way we don't
break the API for already existing user triggers.
If there are no objections I will also merge the removal of the non-keyed
window operator that this PR is based on.
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