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From myui <...@git.apache.org>
Subject [GitHub] incubator-hivemall issue #47: [WIP][HIVEMALL-73] Reduce memory usages of eac...
Date Fri, 17 Feb 2017 10:57:36 GMT
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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