Github user myui commented on the issue:
https://github.com/apache/incubator-hivemall/pull/98
Need to fix output OI.
```
Caused by: java.lang.ClassCastException: java.lang.String cannot be cast to
org.apache.hadoop.io.Text
at
org.apache.hadoop.hive.serde2.objectinspector.primitive.WritableStringObjectInspector.copyObject(WritableStringObjectInspector.java:36)
at
org.apache.hadoop.hive.serde2.objectinspector.ObjectInspectorUtils.copyToStandardObject(ObjectInspectorUtils.java:380)
at
org.apache.hadoop.hive.ql.exec.KeyWrapperFactory$TextKeyWrapper.copyKey(KeyWrapperFactory.java:221)
at
org.apache.hadoop.hive.ql.exec.GroupByOperator.processHashAggr(GroupByOperator.java:786)
at
org.apache.hadoop.hive.ql.exec.GroupByOperator.processKey(GroupByOperator.java:700)
at
org.apache.hadoop.hive.ql.exec.GroupByOperator.process(GroupByOperator.java:768)
```
Also, validation is required for Feature input OI when `-densemodel` option
is specified (only INT or BIGINT is expected).
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