Sergey Shelukhin created HIVE-6430:
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Summary: HIVE-6429 - MapJoin hash table has large memory overhead
Key: HIVE-6430
URL: https://issues.apache.org/jira/browse/HIVE-6430
Project: Hive
Issue Type: Improvement
Reporter: Sergey Shelukhin
Right now, in some queries, I see that storing e.g. 4 ints (2 for key and 2 for
row) can take several hundred bytes, which is ridiculous. I am reducing the
size of MJKey and MJRowContainer in other jiras, but in general we don't need
to have java hash table there. We can either use primitive-friendly hashtable
like the one from HPPC (Apache-licenced), or some variation, to map primitive
keys to single row storage structure without an object per row (similar to
vectorization).
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