Github user chenghao-intel commented on the pull request:
https://github.com/apache/spark/pull/7788#issuecomment-126593823
That's quite confusing when adding the `terminatePartial`, but the reason
that I added for performance concern with Hive integration.
`terminatedPartial` will be called once after we finish the map side
iterating for each group, however, if we removed the `terminatePartial`
function from the UDAF interface, we have to call the hive `terminatedPartial`
within the `update` implementation, that will be very expensive.
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