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Posted to issues-all@impala.apache.org by "Fucun Chu (Jira)" <ji...@apache.org> on 2021/03/02 12:38:00 UTC
[jira] [Updated] (IMPALA-10558) Implement ds_theta_exclude()
function.
[ https://issues.apache.org/jira/browse/IMPALA-10558?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Fucun Chu updated IMPALA-10558:
-------------------------------
Description:
This function receives two strings that are serialized Apache DataSketches Theta sketches. Computes the a-not-b set operation given two sketches of same or different column.
Example:
{code:sql}
select ds_theta_estimate(ds_theta_exclude(sketch1, sketch2)) from sketch_tbl;
+-------------------------------------------------------+
| ds_theta_estimate(ds_theta_exclude(sketch1, sketch2)) |
+-------------------------------------------------------+
| 5 |
+-------------------------------------------------------+
{code}
was:
This function receives two strings that are serialized Apache DataSketches Theta sketches. Computes the a-not-b set operation given two sketches of same or different column.
Example:
```
select ds_theta_estimate(ds_theta_exclude(sketch1, sketch2)) from sketch_tbl;
+-------------------------------------------------------+
| ds_theta_estimate(ds_theta_exclude(sketch1, sketch2)) |
+-------------------------------------------------------+
| 5 |
+-------------------------------------------------------+
```
> Implement ds_theta_exclude() function.
> --------------------------------------
>
> Key: IMPALA-10558
> URL: https://issues.apache.org/jira/browse/IMPALA-10558
> Project: IMPALA
> Issue Type: New Feature
> Components: Backend, Frontend
> Reporter: Fucun Chu
> Assignee: Fucun Chu
> Priority: Major
> Fix For: Impala 4.0
>
>
> This function receives two strings that are serialized Apache DataSketches Theta sketches. Computes the a-not-b set operation given two sketches of same or different column.
> Example:
> {code:sql}
> select ds_theta_estimate(ds_theta_exclude(sketch1, sketch2)) from sketch_tbl;
> +-------------------------------------------------------+
> | ds_theta_estimate(ds_theta_exclude(sketch1, sketch2)) |
> +-------------------------------------------------------+
> | 5 |
> +-------------------------------------------------------+
> {code}
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