Github user wmellouli commented on the issue:
https://github.com/apache/spark/pull/22332
@HyukjinKwon Thank you for your review. To answer to your question about
using `select`, take a look at my explaination
[here](https://github.com/apache/spark/pull/22332#issuecomment-418526562) to
@jaceklaskowski (he asked about the same question
[here](https://github.com/apache/spark/pull/22332#issuecomment-418485371)).
In addition I took into consideration @mgaido91 suggestion
[here](https://github.com/apache/spark/pull/22332#issuecomment-418445688). So
what do you think about this new version ?
Someone can run tests please ?
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