Thejas M Nair created HIVE-14047:
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Summary: add primary key on WRITE_SET
Key: HIVE-14047
URL: https://issues.apache.org/jira/browse/HIVE-14047
Project: Hive
Issue Type: Bug
Components: Transactions
Affects Versions: 1.3.0, 2.1.0
Reporter: Thejas M Nair
WRITE_SET table created in HIVE-13395 should some columns in the primary key. I
expect most databases to organize the data in a b-tree with primary key as the
index (or have an option to do so). That should help in reducing the search
space for your prominent queries. As long as columns in the where clause match
the prefix of the index, it should greatly reduce the search space.
You can add a autoincrement column to keep it unique if necessary. MySQL
(innodb) anyway ends up organizing data on an autoincrement column, which is
useless for the queries (see post ).
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