Github user kiszk commented on the issue:
https://github.com/apache/spark/pull/13680
@rxin thank you for your comment. As you said, holistic view is important.
This PR is not only for machine learning.
This PR has another use case for improving projection of an array in any
program by https://github.com/apache/spark/pull/13911. This PR can also reduce
memory footprint of an array representation and
```DataFrame.cache()/Dataset.cache()``` in any program.
What do you think?
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