mapjoin should be disabled if the size is too large
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Key: HIVE-970
URL: https://issues.apache.org/jira/browse/HIVE-970
Project: Hadoop Hive
Issue Type: New Feature
Components: Query Processor
Reporter: Namit Jain
Based on a detailed discussion with Ning, we were thinking of the following.
Add a configurable parameter, which sets the limit on the usage of mapjoin.
Assume that only the following can increase the size of the table:
UDTF, Transforms, Union, Join
(Although UDF and UDAF can also increase the total size by increasing the size
of the row, that is not likely to happen in the common case).
So, the map join hint will only be honored if none of the above are present at
the source and the size of the table is less than the limit.
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