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https://issues.apache.org/jira/browse/IMPALA-9963?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Gabor Kaszab closed IMPALA-9963.
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Fix Version/s: Impala 4.0
Resolution: Fixed
> 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
> Fix For: Impala 4.0
>
>
> 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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