Github user cloud-fan commented on the pull request:
https://github.com/apache/spark/pull/8234#issuecomment-131684535
Hi @chenghao-intel , thanks for working on this!
However, appending an index to the alising name is not enough to fix this
bug, we also need to make sure the alising name is unique among existing
aggregation expression names.
Actually I have already sent a PR to fix it at
https://github.com/apache/spark/pull/8231, it would be good if you can review
that, thanks!
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