Cheng Su created SPARK-36794:
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Summary: Ignore duplicated join keys when building relation for
LEFT/ANTI hash join
Key: SPARK-36794
URL: https://issues.apache.org/jira/browse/SPARK-36794
Project: Spark
Issue Type: Sub-task
Components: SQL
Affects Versions: 3.3.0
Reporter: Cheng Su
For LEFT SEMI and LEFT ANTI hash equi-join without extra join condition, we
only need to keep one row per unique join key(s) inside hash table
(`HashedRelation`) when building the hash table. This can help reduce the size
of hash table of join.
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