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From "Apache Spark (JIRA)" <j...@apache.org>
Subject [jira] [Assigned] (SPARK-24381) Improve Unit Test Coverage of NOT IN subqueries
Date Thu, 24 May 2018 15:41:00 GMT

     [ https://issues.apache.org/jira/browse/SPARK-24381?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Apache Spark reassigned SPARK-24381:
------------------------------------

    Assignee:     (was: Apache Spark)

> 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
>            Priority: Major
>
> 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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