Eugene Koifman created SPARK-37753:
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Summary: DynamicJoinSelection.shouldDemoteBroadcastHashJoin should
apply to left outer with join many empty partitions on the left
Key: SPARK-37753
URL: https://issues.apache.org/jira/browse/SPARK-37753
Project: Spark
Issue Type: Improvement
Components: SQL
Affects Versions: 2.4.8
Reporter: Eugene Koifman
if {{DynamicJoinSelection}} sees a LOJ where there are many empty partitions on
the left, we want to run it as a shuffle join so that tasks with empty LHS
short circuit quickly.
So we should inhibit Broadcast join.
This is a follow up to SPARK-37193
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