Github user marmbrus commented on the pull request:
https://github.com/apache/spark/pull/3352#issuecomment-63872574
I'd really much rather we try and fix these bugs instead of turning it off
by default. A lot of users are getting sub-optimal performance and these both
seem like corner cases (either way we will clearly state that this default was
changed in the release notes so if people see regressions they know what to
turn off). Can you open JIRAs for these two?
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