Michael Smith created IMPALA-13660:
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Summary: Cache broadcast hash joins
Key: IMPALA-13660
URL: https://issues.apache.org/jira/browse/IMPALA-13660
Project: IMPALA
Issue Type: Improvement
Reporter: Michael Smith
Enable intermediate result caching for broadcast hash joins. The cache key must
incorporate probe and build sides; since the build side will be part of the
cache key, we can rely on the broadcast results being stable.
This differs from a partition join, where we don't have the same guarantees;
partition joins would also incorporate an exchange on the probe side, so our
normal rules would preclude caching it right now.
The build side comes from another fragment, so we need to tolerate an exchange
on the build side, similar to what was done in IMPALA-13185.
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