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  1. IMPALA
  2. IMPALA-10131

Document ds_kll_* functions

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    Details

    • Type: New Feature
    • Status: Open
    • Priority: Major
    • Resolution: Unresolved
    • Affects Version/s: Impala 4.0
    • Fix Version/s: None
    • Component/s: Docs
    • Labels:

      Description

      There were some new functions added recently to add support for Apache DataSketches KLL calculations. These functions purpose is to give an approximate boundaries for
      a given dataset. It is an implementation of a very compact quantiles sketch with lazy compaction scheme and nearly optimal accuracy per bit.

      The newly introduced functions are:
      ds_kll_sketch()
      ds_kll_quantile()
      ds_kll_quantiles_as_string()
      ds_kll_n()
      ds_kll_union()
      ds_kll_rank()
      ds_kll_pmf_as_string()
      ds_kll_cdf_as_string()
      ds_kll_stringify()

      Related Jiras:
      https://issues.apache.org/jira/browse/IMPALA-9959
      https://issues.apache.org/jira/browse/IMPALA-9962
      https://issues.apache.org/jira/browse/IMPALA-9963
      https://issues.apache.org/jira/browse/IMPALA-10017
      https://issues.apache.org/jira/browse/IMPALA-10018
      https://issues.apache.org/jira/browse/IMPALA-10019
      https://issues.apache.org/jira/browse/IMPALA-10020
      https://issues.apache.org/jira/browse/IMPALA-10108

      We should document these and mark them as experimental features so that users can try out and hopefully give feedback.

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            • Assignee:
              Unassigned
              Reporter:
              tadam Adam Tamas
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              Dates

              • Created:
                Updated: