Github user Stibbons commented on the issue:
https://github.com/apache/spark/pull/14918
For information, I continue to look at these kind of simple optimisations
that does not cost too much. Python is a pretty slow language, very productive
in term of code writing, but inefficient in term of execution. So if we can
avoid looping once or twice in a list and replace lists by generator, I think
that is very valuable for the Spark project
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