Github user liancheng commented on the pull request:
https://github.com/apache/spark/pull/2241#issuecomment-54384096
One concern related to Hive Thrift server and CLI support. Currently we're
using some ugly reflection hacks to hook into Hive because related Hive code
was not designed to be extensible for such scenarios
([here](https://github.com/apache/spark/blob/f2b5b619a9efee91573c0e546792e68e72afce21/sql/hive-thriftserver/src/main/scala/org/apache/spark/sql/hive/thriftserver/HiveThriftServer2.scala#L85-L95),
[here](https://github.com/apache/spark/blob/f2b5b619a9efee91573c0e546792e68e72afce21/sql/hive-thriftserver/src/main/scala/org/apache/spark/sql/hive/thriftserver/SparkSQLCLIService.scala#L63-L73)
and
[here](https://github.com/apache/spark/blob/f2b5b619a9efee91573c0e546792e68e72afce21/sql/hive-thriftserver/src/main/scala/org/apache/spark/sql/hive/thriftserver/SparkSQLSessionManager.scala#L35-L48)).
These hacks are brittle and highly depends on specific Hive implementation.
Currently I don't have any thorough plan for this, but this should definitely
be taken into account.
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