[jira] [Updated] (HIVE-7982) Regression in explain with CBO enabled due to issuing query per K,V for the stats

["Mostafa Mokhtar (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/HIVE-7982?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Mostafa Mokhtar updated HIVE-7982:
----------------------------------
    Assignee: Ashutosh Chauhan  (was: Mostafa Mokhtar)

> Regression in explain with CBO enabled due to issuing query per K,V for the stats
> ---------------------------------------------------------------------------------
>
>                 Key: HIVE-7982
>                 URL: https://issues.apache.org/jira/browse/HIVE-7982
>             Project: Hive
>          Issue Type: Bug
>          Components: CBO
>    Affects Versions: 0.14.0
>            Reporter: Mostafa Mokhtar
>            Assignee: Ashutosh Chauhan
>             Fix For: 0.14.0
>
>
> With CBO we need the correct set of indexes to provide an efficient Read/Write access.
> These indexes improve performance of Explain plan and Analyzed table by 60% and 300%.
> {code}
> MySQL 
>  CREATE INDEX PART_COL_STATS_N50 ON PART_COL_STATS (DB_NAME,TABLE_NAME,COLUMN_NAME) USING BTREE;
> MsSQL
> CREATE INDEX PART_COL_STATS_N50 ON PART_COL_STATS (DB_NAME,TABLE_NAME,COLUMN_NAME);
> Oracle 
> CREATE INDEX PART_COL_STATS_N50 ON PART_COL_STATS (DB_NAME,TABLE_NAME,COLUMN_NAME);
> Postgres
> CREATE INDEX "PART_COL_STATS_N50" ON "PART_COL_STATS" USING btree ("DB_NAME","TABLE_NAME","COLUMN_NAME");
> {code}



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