Github user gatorsmile commented on the pull request:
https://github.com/apache/spark/pull/13247#issuecomment-220815712
@cloud-fan Based on my understanding, runtime conf (`class RuntimeConfig`)
is designed as the public/external interface for users to access the internal
conf. If users want to make a change on Config at runtime, they must use
`RuntimeConfig`. In the future, we can further enhance it to block external
users to change the internal conf? Also easier to manage Hadoop configuration
in `RuntimeConfig`?
`SQLConf` will be just an internal implementation of configuration. We do
not expect external users to directly access it.
You know, this is just my understanding. : )
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