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From "ASF GitHub Bot (Jira)" <j...@apache.org>
Subject [jira] [Work logged] (HIVE-23893) Extract deterministic conditions for pdd when the predicate contains non-deterministic function
Date Fri, 31 Jul 2020 01:44:00 GMT

     [ https://issues.apache.org/jira/browse/HIVE-23893?focusedWorklogId=464833&page=com.atlassian.jira.plugin.system.issuetabpanels:worklog-tabpanel#worklog-464833
]

ASF GitHub Bot logged work on HIVE-23893:
-----------------------------------------

                Author: ASF GitHub Bot
            Created on: 31/Jul/20 01:43
            Start Date: 31/Jul/20 01:43
    Worklog Time Spent: 10m 
      Work Description: dengzhhu653 edited a comment on pull request #1322:
URL: https://github.com/apache/hive/pull/1322#issuecomment-666864106


   ... you can give a view on "Understanding Hive Branches" on the above link, and add some
tests.


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Issue Time Tracking
-------------------

    Worklog Id:     (was: 464833)
    Time Spent: 1h 50m  (was: 1h 40m)

> Extract deterministic conditions for pdd when the predicate contains non-deterministic
function
> -----------------------------------------------------------------------------------------------
>
>                 Key: HIVE-23893
>                 URL: https://issues.apache.org/jira/browse/HIVE-23893
>             Project: Hive
>          Issue Type: Improvement
>          Components: Logical Optimizer
>            Reporter: Zhihua Deng
>            Assignee: zhishui
>            Priority: Major
>              Labels: pull-request-available
>          Time Spent: 1h 50m
>  Remaining Estimate: 0h
>
> Taken the following query for example, assume unix_timestamp is non-deterministic before
version 1.3.0:
>   
>  {{SELECT}}
>  {{        from_unixtime(unix_timestamp(a.first_dt), 'yyyyMMdd') AS ft,}}
>  {{        b.game_id AS game_id,}}
>  {{        b.game_name AS game_name,}}
>  {{        count(DISTINCT a.sha1_imei) uv}}
>  {{FROM}}
>  {{        gamesdk_userprofile a}}
>  {{        JOIN game_info_all b ON a.appid = b.dev_app_id}}
>  {{WHERE}}
>  {{        a.date = 20200704}}
>  {{        AND from_unixtime(unix_timestamp(a.first_dt), 'yyyyMMdd') = 20200704}}
>  {{        AND b.date = 20200704}}
>  {{GROUP BY}}
>  {{        from_unixtime(unix_timestamp(a.first_dt), 'yyyyMMdd'),}}
>  {{        b.game_id,}}
>  {{        b.game_name}}
>  {{ORDER BY}}
>  {{        uv DESC}}
>  {{LIMIT 200;}}
>   
>  The predicates(a.date = 20200704, b.date = 20200704) are unable to push down to join
op, make the optimizer unable to prune partitions, which may result  to a full scan on tables gamesdk_userprofile
and game_info_all.



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