[jira] [Updated] (HIVE-25580) Increase the performance of getTableColumnStatistics and getPartitionColumnStatistics

["ASF GitHub Bot (Jira)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/HIVE-25580?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

ASF GitHub Bot updated HIVE-25580:
----------------------------------
    Labels: pull-request-available  (was: )

> Increase the performance of getTableColumnStatistics and getPartitionColumnStatistics
> -------------------------------------------------------------------------------------
>
>                 Key: HIVE-25580
>                 URL: https://issues.apache.org/jira/browse/HIVE-25580
>             Project: Hive
>          Issue Type: Improvement
>          Components: Standalone Metastore
>            Reporter: Peter Vary
>            Assignee: Peter Vary
>            Priority: Major
>              Labels: pull-request-available
>          Time Spent: 10m
>  Remaining Estimate: 0h
>
> When the PART_COL_STATS table contains high number of rows the getTableColumnStatistics and getPartitionColumnStatistics response time increases.
> The root cause is the full table scan for the jdbc query below:
> {code:java}
> 2021-09-27 13:22:44,218 DEBUG DataNucleus.Datastore.Native: [pool-6-thread-199]: SELECT DISTINCT "A0"."ENGINE" FROM "PART_COL_STATS" "A0"
> 2021-09-27 13:22:50,569 DEBUG DataNucleus.Datastore.Retrieve: [pool-6-thread-199]: Execution Time = 6351 ms {code}
> The time spent in [here|https://github.com/apache/hive/blob/ed1882ef569f8d00317597c269cfae35ace5a5fa/standalone-metastore/metastore-server/src/main/java/org/apache/hadoop/hive/metastore/ObjectStore.java#L9965]:
> {code:java}
>       query = pm.newQuery(MPartitionColumnStatistics.class);
>       query.setResult("DISTINCT engine");
>       Collection names = (Collection) query.execute();
> {code}
> We might get a better performance if we limit the query range based on the cat/db/table.



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