Github user zsxwing commented on the pull request:
https://github.com/apache/spark/pull/3505#issuecomment-66411639
> the problem is that sparkconf is immutable once created - so in order to
toggle this on and off, a user would have to restart Spark.
I added this configuration because it's convenient to old codes. I would
encourage people to call `skewedJoin` directly for new codes if they need
skewed join because they are usually familiar with their data.
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