Github user HyukjinKwon commented on the issue:
https://github.com/apache/spark/pull/16747
^ I want to be very sure if we are not going to expose this or not. Could
any SQL committer guy or PMC confirm this?
> `CalendarIntervalType` only for compatibility with similar type in `Hive`.
This means a lot of things for example,
- we might have to hide this
```scala
scala> import org.apache.spark.sql.types.CalendarIntervalType
import org.apache.spark.sql.types.CalendarIntervalType
```
- maybe disallow explicitly giving this type as a schema as it is not
exposed.
- maybe we should not support reading/writing out this type as raised in
https://github.com/apache/spark/pull/15751#issuecomment-258518577
and etc.
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