Github user viirya commented on the pull request:
https://github.com/apache/spark/pull/7418#issuecomment-122153575
@chenghao-intel This pr already groups a certain number of projection
columns (now it is 50) into a function and call it. It is due to the problem
caused by a very long single function inlined with too many projection columns
(as reported in the JIRA ticket, it is more than 100).
If the projection columns is less than the number, it doesn't doing column
grouping and works as before.
I think this should be a very rare use case. For this problem, we shouldn't
add a configuration because it is not a feature or function. It is a bug fixing
to make this kind of projection work.
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