rdblue commented on pull request #30554:
URL: https://github.com/apache/spark/pull/30554#issuecomment-736712335


   > I'll turn off the config once all tests pass, so that it's optional. I 
believe this at least is a useful feature for Spark vendors.
   
   I don't think there is any objection to having a config so you can change it 
in your environment. It is just that there should be more discussion at a 
minimum about breaking changes like this. I also don't think that Spark's 
versioning policy allows it.
   
   > BTW just to make it clear: breaking changes are allowed in point releases. 
You can read the migration guide for each point release to see examples.
   
   Can you point to where this is allowed by the [versioning 
policy](http://spark.apache.org/versioning-policy.html)?


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