Sergey Shelukhin created HIVE-7617:
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Summary: optimize bytes mapjoin hash table read path wrt
serialization, at least for common cases
Key: HIVE-7617
URL: https://issues.apache.org/jira/browse/HIVE-7617
Project: Hive
Issue Type: Improvement
Reporter: Sergey Shelukhin
BytesBytes has table stores keys in the byte array for compact representation,
however that means that the straightforward implementation of lookups
serializes lookup keys to byte arrays, which is relatively expensive.
We can either shortcut hashcode and compare for common types on read path
(integral types which would cover most of the real-world keys), or specialize
hashtable and from BytesBytes... create LongBytes, StringBytes, or whatever.
First one seems simpler now.
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