Dawid Wysakowicz created FLINK-19175:
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Summary: Tests in JoinITCase do not test BroadcastHashJoin
Key: FLINK-19175
URL: https://issues.apache.org/jira/browse/FLINK-19175
Project: Flink
Issue Type: Bug
Components: Table SQL / Planner, Tests
Reporter: Dawid Wysakowicz
The tests in JoinITCase claim to test the {{BroadcastHashJoin}}, but they
actually do not. None of the tables used in the tests have proper statistics
therefore, none of the tables meet the threshold for the broadcast join. At the
same time the {{ShuffleHashJoin}} is not disabled, therefore they silently
fallback to {{ShuffleHashJoin}}.
In summary none (or at least not all of the tests) are executed for
BroadcastHashJoin, but are executed twice for ShuffleHashJoin.
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