Brock Noland created HIVE-4838:
----------------------------------
Summary: Refactor MapJoin HashMap code to improve testability,
readability, and other implementations
Key: HIVE-4838
URL: https://issues.apache.org/jira/browse/HIVE-4838
Project: Hive
Issue Type: Bug
Reporter: Brock Noland
Assignee: Brock Noland
MapJoin is an essential component for high performance joins in Hive and the
current code has done great service for many years. However, the code is
showing it's age and currently suffers from the following issues:
* Uses static state via the MapJoinMetaData class to pass serialization
metadata to the Key, Row classes.
* The api of a logical "Table Container" is not defined and therefore it's
unclear what apis HashMapWrapper
needs to publicize. Additionally HashMapWrapper has many used public methods.
* HashMapWrapper contains logic to serialize, test memory bounds, and implement
the table container. Ideally these logical units could be seperated
* HashTableSinkObjectCtx has unused fields and unused methods
* CommonJoinOperator and children use ArrayList on left hand side when only
List is required
* There are unused classes Unused classes MRU, DCLLItemm, MapJoinSingleKey, and
MapJoinDoubleKeys
--
This message is automatically generated by JIRA.
If you think it was sent incorrectly, please contact your JIRA administrators
For more information on JIRA, see: http://www.atlassian.com/software/jira
