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Posted to issues@hive.apache.org by "ASF GitHub Bot (Jira)" <ji...@apache.org> on 2019/11/02 18:32:00 UTC
[jira] [Work logged] (HIVE-22448) CBO: Expand the multiple count
distinct with a group-by key
[ https://issues.apache.org/jira/browse/HIVE-22448?focusedWorklogId=337738&page=com.atlassian.jira.plugin.system.issuetabpanels:worklog-tabpanel#worklog-337738 ]
ASF GitHub Bot logged work on HIVE-22448:
-----------------------------------------
Author: ASF GitHub Bot
Created on: 02/Nov/19 18:31
Start Date: 02/Nov/19 18:31
Worklog Time Spent: 10m
Work Description: jcamachor commented on pull request #838: HIVE-22448
URL: https://github.com/apache/hive/pull/838
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Issue Time Tracking
-------------------
Worklog Id: (was: 337738)
Remaining Estimate: 0h
Time Spent: 10m
> CBO: Expand the multiple count distinct with a group-by key
> -----------------------------------------------------------
>
> Key: HIVE-22448
> URL: https://issues.apache.org/jira/browse/HIVE-22448
> Project: Hive
> Issue Type: Bug
> Components: CBO
> Reporter: Gopal Vijayaraghavan
> Assignee: Jesus Camacho Rodriguez
> Priority: Major
> Labels: pull-request-available
> Attachments: HIVE-22448.01.patch, HIVE-22448.patch
>
> Time Spent: 10m
> Remaining Estimate: 0h
>
> {code}
> create temporary table mytable1 (x integer, y integer, z integer, a integer);
> explain cbo
> select z, x, count(distinct y), count(distinct a)
> from mytable1
> group by z, x;
> explain cbo
> select count(distinct y), count(distinct a)
> from mytable1
> {code}
> The first is not vectorized, the second one is because of the grouping-set based rewrite for count distinct.
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