Hyunsik Choi created TAJO-1058:
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Summary: Implement off-heap hash table for hash aggregation
Key: TAJO-1058
URL: https://issues.apache.org/jira/browse/TAJO-1058
Project: Tajo
Issue Type: Improvement
Components: physical operator
Reporter: Hyunsik Choi
Fix For: block_iteration
See the title.
Currently, we use HashMap for hash aggregation. It causes GC overheads when the
number of distinct hash keys is over tens of millions. We need to implement an
alternative to the current implementation. This implementation should consider
block iteration addressed in TAJO-1041.
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