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https://issues.apache.org/jira/browse/HIVE-23282?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Attila Magyar reassigned HIVE-23282:
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Assignee: Rajesh Balamohan (was: Attila Magyar)
> Reduce number of DB calls in ObjectStore::getPartitionsByExprInternal
> ---------------------------------------------------------------------
>
> Key: HIVE-23282
> URL: https://issues.apache.org/jira/browse/HIVE-23282
> Project: Hive
> Issue Type: Improvement
> Components: Metastore
> Reporter: Rajesh Balamohan
> Assignee: Rajesh Balamohan
> Priority: Major
> Attachments: HIVE-23282.1.patch, HIVE-23282.2.patch,
> image-2020-04-23-14-07-06-077.png
>
>
> ObjectStore::getPartitionsByExprInternal internally uses Table information
> for getting partitionKeys, table, catalog name.
>
> For this, it ends up populating entire table data from DB (including skew
> column, parameters, sort, bucket cols etc). This makes it a lot more
> expensive call. It would be good to check if MTable itself can be used
> instead of Table.
> [https://github.com/apache/hive/blob/master/standalone-metastore/metastore-server/src/main/java/org/apache/hadoop/hive/metastore/ObjectStore.java#L3327]
> [https://github.com/apache/hive/blob/master/standalone-metastore/metastore-server/src/main/java/org/apache/hadoop/hive/metastore/ObjectStore.java#L3669]
>
> !image-2020-04-23-14-07-06-077.png|width=665,height=592!
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