Cheng Su created SPARK-35241:
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Summary: Investigate to prefer vectorized hash map in hash
aggregate selectively
Key: SPARK-35241
URL: https://issues.apache.org/jira/browse/SPARK-35241
Project: Spark
Issue Type: Improvement
Components: SQL
Affects Versions: 3.2.0
Reporter: Cheng Su
In hash aggregate, we always use row-based hash map as first level hash map in
production, and use vectorized hash map in testing / benchmarking. However we
do find in micro-benchmark that vectorized hash map is better than row-based
hash map e.g. with single key -
[https://github.com/apache/spark/pull/32357#discussion_r620914345] . So we
should re-evaluate the decision to always use row-based hash map or not. And
maybe come up with a more adaptive decision policy to choose which map to use
depending on keys / values.
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