Github user myui commented on the issue:
https://github.com/apache/incubator-hivemall/pull/117
Need to fix the following error:
```
testAllSamples(hivemall.recommend.SlimUDTFTest) Time elapsed: 0.285 sec
<<< ERROR!
java.lang.NullPointerException: null
at
hivemall.utils.collections.maps.IntOpenHashTable.put(IntOpenHashTable.java:126)
at hivemall.recommend.SlimUDTF.getKNNi(SlimUDTF.java:689)
at hivemall.recommend.SlimUDTF.process(SlimUDTF.java:281)
at hivemall.recommend.SlimUDTFTest.testAllSamples(SlimUDTFTest.java:93)
```
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