Github user clockfly commented on the issue:
https://github.com/apache/spark/pull/14562
I think my biggest concern is about the performance and abstraction.
1. Seems there are too many function call to update each row. Is this cost
too high?
2. The new methods added in ImperativeAggregate may create confusion, like
There are both
```
def update
def doUpdate
def merge
def doMerge
def initialize
def doInitialize
```
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