Github user viirya commented on the issue:
https://github.com/apache/spark/pull/16633
@scwf You still don't get the point. Although few partitions need to
recompute in local limit, most of other partitions are saved from computation.
In most cases, it is worth. You can refer to my previous comment that shows a
simple calculation.
It doesn't matter the local limit is simple or complex. In simple words,
one is to recompute 1 partition, another is to compute all 100 partitions,
which one is better?
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