Github user cloud-fan commented on the issue:
https://github.com/apache/spark/pull/15082
After some more discussion, I'm going to reopen it:
1. `InternalRow.copy` breaks the copy contract and the fix in this PR is
necessary
2. `MutableProjection` may bite us in the future if we don't fix it
3. It turns out `Collect` is the only `ImperativeAggregate` that we need to
fix while updating aggregation buffer, so it's not a lot of work.
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