[jira] [Work started] (IMPALA-9963) Implement ds_kll_n() function

["Gabor Kaszab (Jira)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/IMPALA-9963?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Work on IMPALA-9963 started by Gabor Kaszab.
--------------------------------------------
> Implement ds_kll_n() function
> -----------------------------
>
>                 Key: IMPALA-9963
>                 URL: https://issues.apache.org/jira/browse/IMPALA-9963
>             Project: IMPALA
>          Issue Type: Improvement
>          Components: Backend
>            Reporter: Gabor Kaszab
>            Assignee: Gabor Kaszab
>            Priority: Major
>
> ds_kll_n() receives a serialized Apache DataSketches KLL sketch and returns how many values were fed into the sketch.
> Returns a bigint.
> Example:
> {code:java}
> select ds_kll_n(ds_kll_sketch(cast(int_col as float))) from table_name;
> +------+
> | _c0  |
> +------+
> | 6    |
> +------+
> {code}



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