Reynold Xin created SPARK-9258:
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Summary: Remove BroadcastLeftSemiJoinHash
Key: SPARK-9258
URL: https://issues.apache.org/jira/browse/SPARK-9258
Project: Spark
Issue Type: Improvement
Components: SQL
Reporter: Reynold Xin
We have too many join operators than our resources to optimize them. In this
case, BroadcastLeftSemiJoinHash isn't very necessary. We can still use an
equi-join operator to do the join, and just not include any values from the
other join.
We waste a little bit space due to building a hash map rather than a hash set,
but at the end of the day unless we are going to spend a lot of time optimizing
hash set, our Tungsten hash map will be a lot more efficient than the hash set
anyway ...
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