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  1. Hive
  2. HIVE-8397

Approximated cardinality with HyperLogLog UDAF

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Details

    • Improvement
    • Status: Patch Available
    • Trivial
    • Resolution: Unresolved
    • None
    • None
    • UDF
    • None

    Description

      Useful sometimes for quick estimation of bulk data. 

      select hll(key), hll(value) from src;

      Also can be used with hive.fetch.task.aggr=true;

      Attachments

        1. HIVE-8397.1.patch.txt
          15 kB
          Navis Ryu
        2. HIVE-8397.2.patch.txt
          15 kB
          Navis Ryu

        Issue Links

          is related to

          New Feature - A new feature of the product, which has yet to be developed. HIVE-7402 add `approx_distinct` & composable nDV UDAFs

          • Major - Major loss of function.
          • Resolved

          Activity

            People

              navis Navis Ryu
              navis Navis Ryu
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              Dates

                Created:
                Updated: