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