Github user davies commented on the pull request:
https://github.com/apache/spark/pull/9349#issuecomment-153448480
@wzhfy The first part change is good (remove dialectClassName). But other
one may introduce regression, when you have `spark.sql.dialect sql` in
conf/spark-default.conf, you will still got hiveql in HiveContext. I think we
should fix the issue while procesing `set spark.sql.dialect`, which should call
`conf.dialect`, not `conf.getConf`.
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