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https://issues.apache.org/jira/browse/IMPALA-9963?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17172648#comment-17172648
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ASF subversion and git services commented on IMPALA-9963:
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Commit 87aeb2ad78e2106f1d8df84d4d84975c7cde5b5a in impala's branch
refs/heads/master from Gabor Kaszab
[ https://gitbox.apache.org/repos/asf?p=impala.git;h=87aeb2a ]
IMPALA-9963: Implement ds_kll_n() function
This function receives a serialized Apache DataSketches KLL sketch
and returns how many input values were fed into this sketch.
Change-Id: I166e87a468e68e888ac15fca7429ac2552dbb781
Reviewed-on: http://gerrit.cloudera.org:8080/16259
Reviewed-by: Impala Public Jenkins <[email protected]>
Tested-by: Impala Public Jenkins <[email protected]>
> 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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