Add support for index joins in Hive
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Key: HIVE-2845
URL: https://issues.apache.org/jira/browse/HIVE-2845
Project: Hive
Issue Type: New Feature
Reporter: Namit Jain
Hive supports indexes, which are used for filters currently.
It would be very useful to add support for index-based joins in Hive.
If 2 tables A and B are being joined, and an index exists on the join key of A,
B can be scanned (by the mappers), and for each row in B, a lookup for the
corresponding row in A can be performed.
This can be very useful for some usecases.
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