Github user takuti commented on the issue:
https://github.com/apache/incubator-hivemall/pull/87
@myui good catch & nice work~
If I remember correctly, I previously noticed the difference between `Text`
and `String` as label of `FeatureValue`, and thus I replaced
`NIOUtils.getString(src)` with `new Text(NIOUtils.getString(src))`. Since the
unit test has been passed at the moment, I misguidedly considered the problem
has been fixed.
I will try to look into the problem more.
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