Github user myui commented on the issue:
https://github.com/apache/incubator-hivemall/pull/47
@maropu I found that `each_top_k` behavior on Spark is little bit
difference one from Hive for the ranking scheme in
https://github.com/apache/incubator-hivemall/blob/master/core/src/main/java/hivemall/tools/EachTopKUDTF.java#L198
Hive provides a
[dense_rank](https://blog.jooq.org/2013/10/09/sql-trick-row_number-is-to-select-what-dense_rank-is-to-select-distinct/)
but Spark does not.
https://github.com/apache/incubator-hivemall/blob/72d6a629f972abc2f38c63d20fe5c978618f8bf8/spark/spark-2.0/src/main/scala/org/apache/spark/sql/catalyst/expressions/EachTopK.scala#L101
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