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https://issues.apache.org/jira/browse/IMPALA-10282?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Fucun Chu resolved IMPALA-10282.
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Fix Version/s: Impala 4.0
Resolution: Fixed
> Implement ds_cpc_sketch() and ds_cpc_estimate() functions
> ----------------------------------------------------------
>
> Key: IMPALA-10282
> URL: https://issues.apache.org/jira/browse/IMPALA-10282
> Project: IMPALA
> Issue Type: New Feature
> Components: Backend, Frontend
> Reporter: Fucun Chu
> Assignee: Fucun Chu
> Priority: Major
> Fix For: Impala 4.0
>
>
> These should be built-in functions that use DataSketches functionality that
> was integrated by IMPALA-10279.
> ds_cpc_sketch() should receive a primitive expression and return a sketch in
> string type (or binary once that work is submitted).
> ds_cpc_estimate() should receive a sketch and return an estimate of unique
> count from a given CpcSketch.
> Usage:
> select ds_cpc_estimate(ds_cpc_sketch(col_name)) from table_name;
> Hive change that introduced the same:
> https://issues.apache.org/jira/browse/HIVE-22940
> Some further examples found here:
> [http://datasketches.apache.org/docs/CPC/CpcCppExample.html]
>
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