David Tolnay created SPARK-7611:
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Summary: Support HashJoin if the join condition uses eqNullSafe/<=>
Key: SPARK-7611
URL: https://issues.apache.org/jira/browse/SPARK-7611
Project: Spark
Issue Type: Improvement
Components: SQL
Affects Versions: 1.3.1
Reporter: David Tolnay
Currently ExtractEquiJoinKeys only looks for EqualTo, not EqualNullSafe. So if
your join condition uses eqNullSafe/<=> instead of equalTo/===, you end up with
the CartesianProduct strategy instead of HashJoin.
This requires many changes under org.apache.spark.sql.execution.joins, where
code assumes rows can only join "if (!key.anyNull)".
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