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Posted to dev@hive.apache.org by "Gopal V (JIRA)" <ji...@apache.org> on 2016/08/06 01:10:20 UTC

[jira] [Created] (HIVE-14451) Vectorization: Add byRef mode for borrowed Strings in VectorDeserializeRow

Gopal V created HIVE-14451:
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             Summary: Vectorization: Add byRef mode for borrowed Strings in VectorDeserializeRow
                 Key: HIVE-14451
                 URL: https://issues.apache.org/jira/browse/HIVE-14451
             Project: Hive
          Issue Type: Improvement
          Components: Vectorization
            Reporter: Gopal V


In a majority of cases, when using the OptimizedHashMap, the references to the byte[] are immutable. 

The hashmap result always allocates on boundary conditions, but never mutates a previous buffer.

Copying Strings out of the hashtable is entirely wasteful and it would be easy to know when the currentBytes is a borrowed slice from the original input.



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