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Posted to issues-all@impala.apache.org by "ASF subversion and git services (Jira)" <ji...@apache.org> on 2020/09/02 11:41:00 UTC
[jira] [Commented] (IMPALA-10108) Implement ds_kll_stringify
function
[ https://issues.apache.org/jira/browse/IMPALA-10108?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17189179#comment-17189179 ]
ASF subversion and git services commented on IMPALA-10108:
----------------------------------------------------------
Commit 4cb3c3556e77ee24003383155ca5e1b70be4db6e in impala's branch refs/heads/master from Adam Tamas
[ https://gitbox.apache.org/repos/asf?p=impala.git;h=4cb3c35 ]
IMPALA-10108: Implement ds_kll_stringify function
This function receives a string that is a serialized Apache DataSketches
KLL sketch and returns its stringified format.
A stringified format should look like and contains the following data:
select ds_kll_stringify(ds_kll_sketch(float_col))
from functional_parquet.alltypestiny;
+--------------------------------------------+
| ds_kll_stringify(ds_kll_sketch(float_col)) |
+--------------------------------------------+
| ### KLL sketch summary: |
| K : 200 |
| min K : 200 |
| M : 8 |
| N : 8 |
| Epsilon : 1.33% |
| Epsilon PMF : 1.65% |
| Empty : false |
| Estimation mode: false |
| Levels : 1 |
| Sorted : false |
| Capacity items : 200 |
| Retained items : 8 |
| Storage bytes : 64 |
| Min value : 0 |
| Max value : 1.1 |
| ### End sketch summary |
| |
+--------------------------------------------+
Change-Id: I97f654a4838bf91e3e0bed6a00d78b2c7aa96f75
Reviewed-on: http://gerrit.cloudera.org:8080/16370
Reviewed-by: Impala Public Jenkins <im...@cloudera.com>
Tested-by: Impala Public Jenkins <im...@cloudera.com>
> Implement ds_kll_stringify function
> -----------------------------------
>
> Key: IMPALA-10108
> URL: https://issues.apache.org/jira/browse/IMPALA-10108
> Project: IMPALA
> Issue Type: New Feature
> Components: Backend
> Reporter: Gabor Kaszab
> Assignee: Adam Tamas
> Priority: Major
>
> ds_kll_stringify() receives a string that is a serialized Apache DataSketches sketch and returns its stringified format by invoking the related function on the sketch's interface.
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