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Posted to issues@hive.apache.org by "ASF GitHub Bot (Jira)" <ji...@apache.org> on 2020/07/24 09:43:00 UTC
[jira] [Work logged] (HIVE-23893) Extract deterministic conditions
for pdd when the predicate contains non-deterministic function
[ https://issues.apache.org/jira/browse/HIVE-23893?focusedWorklogId=462885&page=com.atlassian.jira.plugin.system.issuetabpanels:worklog-tabpanel#worklog-462885 ]
ASF GitHub Bot logged work on HIVE-23893:
-----------------------------------------
Author: ASF GitHub Bot
Created on: 24/Jul/20 09:42
Start Date: 24/Jul/20 09:42
Worklog Time Spent: 10m
Work Description: dengzhhu653 opened a new pull request #1308:
URL: https://github.com/apache/hive/pull/1308
…te contains non-deterministic function
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Issue Time Tracking
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Worklog Id: (was: 462885)
Remaining Estimate: 0h
Time Spent: 10m
> 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
> Priority: Major
> Time Spent: 10m
> 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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