[jira] [Created] (HIVE-7617) optimize bytes mapjoin hash table read path wrt serialization, at least for common cases

["Sergey Shelukhin (JIRA)" <ji...@apache.org>]

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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