Github user JoshRosen commented on the pull request:
https://github.com/apache/spark/pull/7689#issuecomment-125435692
Looks like `UnsafeRow.get` doesn't support IntervalType:
```
org.apache.spark.SparkException: Job aborted due to stage failure: Task 0
in stage 1153.0 failed 1 times, most recent failure: Lost task 0.0 in stage
1153.0 (TID 4994, localhost): java.lang.UnsupportedOperationException:
Unsupported data type interval
[info] at
org.apache.spark.sql.catalyst.expressions.UnsafeRow.get(UnsafeRow.java:271)
[info] at
org.apache.spark.sql.catalyst.CatalystTypeConverters$IdentityConverter.toScalaImpl(CatalystTypeConverters.scala:144)
[info] at
org.apache.spark.sql.catalyst.CatalystTypeConverters$CatalystTypeConverter.toScala(CatalystTypeConverters.scala:118)
[info] at
org.apache.spark.sql.catalyst.CatalystTypeConverters$StructConverter.toScala(CatalystTypeConverters.scala:268)
[info] at
org.apache.spark.sql.catalyst.CatalystTypeConverters$StructConverter.toScala(CatalystTypeConverters.scala:235)
```
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