Github user viirya commented on the pull request:
https://github.com/apache/spark/pull/5572#issuecomment-94179447
@tbertelsen Good point. I agree with the idea 1. I will update it later.
I was thinking to add a parameter as you did to `RDD.iterator`. I use the
configuration because I try to avoid modifying the current api. So it is
easiest to do this by adding a configuration. But as you pointed, when the
option is enabled, the cache for all non-cartesian operations will be affected.
I just checked the report of failed unit test. Looks like that current
version using conf has a problem. And it can not be avoided without modifying
the api. So I think adding parameter to `iterator` is better than using
configuration.
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