Chu Tong created HIVE-7961:
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Summary: metastore schema improvement for adding partition to Hive
table
Key: HIVE-7961
URL: https://issues.apache.org/jira/browse/HIVE-7961
Project: Hive
Issue Type: Bug
Components: Metastore
Reporter: Chu Tong
Priority: Minor
One of the performance bottlenecks for adding a partition in Hive table and the
query takes most of the time in this process is:
SELECT A0.PART_NAME FROM PARTITIONS A0 LEFT OUTER JOIN TBLS B0 ON A0.TBL_ID =
B0.TBL_ID LEFT OUTER JOIN DBS C0 ON B0.DB_ID = C0.DB_ID WHERE B0.TBL_NAME = @P0
AND C0."NAME" = @P1 AND A0.PART_NAME = @P2
This query joins partition table with table table and database table in Hive
metastore and it becomes slow when these tables are big.
A viable way to optimize this is the de-normalize the partition table.
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