Github user chenghao-intel commented on the pull request:

    https://github.com/apache/spark/pull/2825#issuecomment-59456929
  
    I think people want to customize something other than default, a better way 
is to create an new `Context` class which derives from `SQLContext`, just like 
the `HiveContext` does. In the other hand, since the `Catalyst` focus on the 
logical plan optimization, why not just keep adding / updating the rules 
(object)?



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