Github user clockfly commented on the issue:
https://github.com/apache/spark/pull/14723
@liancheng @cloud-fan
@yhuai @hvanhovell @gatorsmile
This PR is superceded by #14753, please review the new PR instead.
The motivation behind the change is that the aggregation function is also
used by WindowExec, which may do continous `update` and `eval`. We have to
override `eval` of ImperativeAggregate so that `eval` can accepts an
aggregation buffer which contains generic Java object.
For example:
```
agg.update(buffer, row1)
agg.eval(buffer)
agg.update(buffer, row2)
agg.eal(buffer)
```
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