Github user myui commented on the issue:
https://github.com/apache/incubator-hivemall/pull/82
@takuti Root cause is NPE. The RuntimeException is caught and re-thrown in
https://github.com/apache/hive/blob/master/ql/src/java/org/apache/hadoop/hive/ql/exec/FunctionRegistry.java#L1039
The exception message is generated in Hive runtime. So, we cannot change
it.
Root cause is that UDFs should not throw RuntimeException.
```
Caused by: java.lang.NullPointerException
at hivemall.tools.text.TokenizeUDF.evaluate(TokenizeUDF.java:42)
... 26 more
```
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