Github user hvanhovell commented on the issue:
https://github.com/apache/spark/pull/14452
@viirya I am still trying to figure out the added value of this PR. Here is
my main question/concern: Spark pipelines operators in a single stage. Results
are only materialized at the end of a stage (Exchanging/Collect/Writing data).
So what is the point of reusing a plan if it not materialized?
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