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

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

Mostafa Mokhtar created HIVE-7982:
-------------------------------------

             Summary: 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: Mostafa Mokhtar
             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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