Github user marmbrus commented on the pull request:
https://github.com/apache/spark/pull/10205#issuecomment-206039890
In particular the implicit wrapping of `OptionalConfigEntry[T]` to be a
`ConfigEntry[Option[T]]` coupled with the unwrapping done via overloading of
`getConf` took me a while to unpack. Maybe I'm just hitting a bug, but if I do
the following to get an optional config:
```scala
val checkpointConfig: Option[String] =
df.sqlContext.conf.getConf(SQLConf.CHECKPOINT_LOCATION)
```
- intelij for some reason isn't understanding it and is underlining it in
red.
- its throwing `java.util.NoSuchElementException:
spark.sql.streaming.checkpointLocation`.
To get it to work correctly I have to write:
```scala
val checkpointConfig: Option[String] =
df.sqlContext.conf.getConf(
SQLConf.CHECKPOINT_LOCATION.asInstanceOf[ConfigEntry[Option[String]]],
None)
```
Am I doing something wrong?
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