[jira] [Work logged] (HIVE-24911) Metastore: Create index on SDS.CD_ID for Postgres

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

     [ https://issues.apache.org/jira/browse/HIVE-24911?focusedWorklogId=599672&page=com.atlassian.jira.plugin.system.issuetabpanels:worklog-tabpanel#worklog-599672 ]

ASF GitHub Bot logged work on HIVE-24911:
-----------------------------------------

                Author: ASF GitHub Bot
            Created on: 20/May/21 08:17
            Start Date: 20/May/21 08:17
    Worklog Time Spent: 10m 
      Work Description: zeroflag commented on pull request #2090:
URL: https://github.com/apache/hive/pull/2090#issuecomment-844848865


   LGTM


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

    Worklog Id:     (was: 599672)
    Time Spent: 20m  (was: 10m)

> Metastore: Create index on SDS.CD_ID for Postgres
> -------------------------------------------------
>
>                 Key: HIVE-24911
>                 URL: https://issues.apache.org/jira/browse/HIVE-24911
>             Project: Hive
>          Issue Type: Improvement
>            Reporter: László Bodor
>            Assignee: László Bodor
>            Priority: Major
>              Labels: pull-request-available
>         Attachments: command-output.txt
>
>          Time Spent: 20m
>  Remaining Estimate: 0h
>
> While investigating HIVE-24870, we found that during a long incremental replication, an SDS.CD_ID can improve the performance.
> It was tested by postgres like below:
> {code}
> CREATE INDEX IF NOT EXISTS "SDS_N50" ON "SDS" USING btree ("CD_ID");
> EXPLAIN (ANALYZE,BUFFERS,TIMING) select count(*) from "SDS" where "CD_ID"=THE_MOST_FREQUENTLY_USED_CD_ID_HERE;
> DROP INDEX IF EXISTS "SDS_N50";
> EXPLAIN (ANALYZE,BUFFERS,TIMING) select count(*) from "SDS" where "CD_ID"=THE_MOST_FREQUENTLY_USED_CD_ID_HERE;
> {code}
> Further results can be found in:  [^command-output.txt] 
> After some investigation, I found that this index is also part of the schemas for a very long time:
> orcale: HIVE-2928
> mysql: HIVE-2246
> mssql: HIVE-6862 (or earlier)
> ...except Postgres.



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