Github user viirya commented on the issue:
https://github.com/apache/spark/pull/14452
@rxin has pointed out:
> Adding an explicit cache call btw -- can actually slow things down due to
bad memory management.
In my experiment, I found:
According to my test in local cluster, without the cache call, I can't see
actual speed-up. Only with cache call, I can see improvement.
However the effective caching for rows needs additional `copy` call which
adds costs and reduces the improvement.
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