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Posted to issues-all@impala.apache.org by "Adam Tamas (Jira)" <ji...@apache.org> on 2020/09/04 07:36:00 UTC

[jira] [Resolved] (IMPALA-10133) Implement ds_hll_stringify()

     [ https://issues.apache.org/jira/browse/IMPALA-10133?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Adam Tamas resolved IMPALA-10133.
---------------------------------
    Fix Version/s: Impala 4.0
       Resolution: Done

> Implement ds_hll_stringify()
> ----------------------------
>
>                 Key: IMPALA-10133
>                 URL: https://issues.apache.org/jira/browse/IMPALA-10133
>             Project: IMPALA
>          Issue Type: Sub-task
>            Reporter: Adam Tamas
>            Assignee: Adam Tamas
>            Priority: Major
>             Fix For: Impala 4.0
>
>
> This function receives a string that is a serialized Apache DataSketches
> HLL sketch and returns its stringified format.
> A stringified format should look like and contains the following data:
> {code:java}
> (select ds_hll_stringify(ds_hll_sketch(i)) from t;)
> +----------------------------------------------------+
> |                        _c0                         |
> +----------------------------------------------------+
> | ### HLL SKETCH SUMMARY: 
>   Log Config K   : 12
>   Hll Target     : HLL_4
>   Current Mode   : LIST
>   Memory         : true
>   LB             : 1.0
>   Estimate       : 1.0
>   UB             : 1.000049929250618
>   OutOfOrder Flag: false
>   Coupon Count   : 1
>  |
> +----------------------------------------------------+
> {code}



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