Miles Yucht created SPARK-24381:
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Summary: Improve Unit Test Coverage of NOT IN subqueries
Key: SPARK-24381
URL: https://issues.apache.org/jira/browse/SPARK-24381
Project: Spark
Issue Type: Improvement
Components: SQL
Affects Versions: 2.3.2
Reporter: Miles Yucht
Today, the unit test coverage for NOT IN queries in SubquerySuite is somewhat
lacking. There are a couple test cases that exist, but it isn't necessarily
clear that those tests cover all of the subcomponents of null-aware anti joins,
i.e. where the subquery returns a null value, if specific columns of either
relation are null, etc. Also, it is somewhat difficult for a newcomer to
understand the intended behavior of a null-aware anti join without great
effort. We should make sure we have proper coverage as well as improve the
documentation of this particular subquery, especially with respect to null
behavior.
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