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Posted to issues@hive.apache.org by "ASF GitHub Bot (Jira)" <ji...@apache.org> on 2022/05/25 00:24:00 UTC
[jira] [Work logged] (HIVE-25867) Partition filter condition should pushed down to metastore query if it is equivalence Predicate
[ https://issues.apache.org/jira/browse/HIVE-25867?focusedWorklogId=774303&page=com.atlassian.jira.plugin.system.issuetabpanels:worklog-tabpanel#worklog-774303 ]
ASF GitHub Bot logged work on HIVE-25867:
-----------------------------------------
Author: ASF GitHub Bot
Created on: 25/May/22 00:23
Start Date: 25/May/22 00:23
Worklog Time Spent: 10m
Work Description: github-actions[bot] commented on PR #2947:
URL: https://github.com/apache/hive/pull/2947#issuecomment-1136557128
This pull request has been automatically marked as stale because it has not had recent activity. It will be closed if no further activity occurs.
Feel free to reach out on the dev@hive.apache.org list if the patch is in need of reviews.
Issue Time Tracking
-------------------
Worklog Id: (was: 774303)
Time Spent: 2h 20m (was: 2h 10m)
> Partition filter condition should pushed down to metastore query if it is equivalence Predicate
> -----------------------------------------------------------------------------------------------
>
> Key: HIVE-25867
> URL: https://issues.apache.org/jira/browse/HIVE-25867
> Project: Hive
> Issue Type: Improvement
> Components: Standalone Metastore
> Reporter: shezm
> Assignee: shezm
> Priority: Major
> Labels: pull-request-available
> Fix For: 4.0.0
>
> Time Spent: 2h 20m
> Remaining Estimate: 0h
>
> The colnum type of the partition is different from the column type of the hql query, the metastore will not push down the query to the RDBMS, but will instead get all PARTITIONS.PART_NAME of the hive table then filter it according to the hql Expression.
> https://github.com/apache/hive/blob/5b112aa6dcc4e374c0a7c2b24042f24ae6815da1/standalone-metastore/metastore-server/src/main/java/org/apache/hadoop/hive/metastore/MetaStoreDirectSql.java#L1316
> If the hive table has too many partitions and there are multiple hql queries at the same time,RDBMS will increasing CPU IO_WAIT and affect performance.
> If the partition filter condition in hql is an equivalent predicate, the metastore should be pushed down to RDBMS, which can optimize the query performance of hive large tables.
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