Github user liancheng commented on the pull request:
https://github.com/apache/spark/pull/9740#issuecomment-157121925
Another approach for this problem is to have "global" options. For example,
`SET -g key=value` sets `key` to `value` for all sessions. This adds a new
concept and requires more work, but seems to be cleaner and in general more
useful. What need to be done are:
1. Add a new syntax `SET -g`
1. Each `HiveContext` should remember its parent `HiveContext` so that we
can retrieve the "root" one.
1. When a global option is set, it's always set in the root `HiveContext`.
Another benefit of this approach is that we don't need to restart the
Thrift server to switch between single-/multi-session modes.
@marmbrus @davies @yhuai Any suggestions?
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