Stamatis Zampetakis created HIVE-24221:
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Summary: Use vectorizable expression to combine multiple columns
in semijoin bloom filters
Key: HIVE-24221
URL: https://issues.apache.org/jira/browse/HIVE-24221
Project: Hive
Issue Type: Improvement
Components: Query Planning
Environment:
Reporter: Stamatis Zampetakis
Assignee: Stamatis Zampetakis
Currently, multi-column semijoin reducers use an n-ary call to
GenericUDFMurmurHash to combine multiple values into one, which is used as an
entry to the bloom filter. However, there are no vectorized operators that
treat n-ary inputs. The same goes for the vectorized implementation of
GenericUDFMurmurHash introduced in HIVE-23976.
The goal of this issue is to choose an alternative way to combine multiple
values into one to pass in the bloom filter comprising only vectorized
operators.
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