Github user dmateusp commented on the issue:
https://github.com/apache/spark/pull/21706
Realized I need to add `calendarinterval` as a function as well to
reproduce the behavior of `int`, `date`, `string` etc..
example:
```scala
scala> spark.sql("select string(10)").show()
+------------------+
|CAST(10 AS STRING)|
+------------------+
| 10|
+------------------+
```
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