Github user marmbrus commented on the pull request:
https://github.com/apache/spark/pull/4994#issuecomment-91945993
This is not correct and was only passing tests because there are not enough
tests for code generation. With the new tests that have been added it now
fails. The `updateProjection` needs both the input of the aggregation buffer
__and__ the joined row as input in order function correctly.
I suggest we close this issue.
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