hyoungjunkim created TAJO-691:
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Summary: HashJoin or HashAggregation is too slow if there is many
unique keys
Key: TAJO-691
URL: https://issues.apache.org/jira/browse/TAJO-691
Project: Tajo
Issue Type: Improvement
Reporter: hyoungjunkim
HashJoin or HashAggregation is too slow if there is many unique keys.
Java's native Map is inefficient to handle many items. In case more than 1
million items in HashMap, Adding 10000 items takes more than 7 ~ 10 seconds.
This should be improved.
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