Github user chenghao-intel commented on the pull request:
https://github.com/apache/spark/pull/9429#issuecomment-153276233
That's cool, I like the idea to re-implement it by introducing a UDTF
function, which looks much simpler.
But it breaks the unit test in my local, as run the unit test like below:
```
build/sbt -Phive -Dspark.hive.whitelist='groupby.*_grouping.*' 'test-only
org.apache.spark.sql.hive.execution.HiveCompatibilitySuite'
```
Some unresolved attribute exceptions, I didn't dig it yet, but can you
solve that?
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