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https://issues.apache.org/jira/browse/SPARK-23062?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Xiao Li resolved SPARK-23062.
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Resolution: Fixed
Assignee: Henry Robinson
Fix Version/s: 2.3.0
> EXCEPT documentation should make it clear that it's EXCEPT DISTINCT
> -------------------------------------------------------------------
>
> Key: SPARK-23062
> URL: https://issues.apache.org/jira/browse/SPARK-23062
> Project: Spark
> Issue Type: Improvement
> Components: Documentation, SQL
> Affects Versions: 2.0.0
> Reporter: Henry Robinson
> Assignee: Henry Robinson
> Priority: Trivial
> Fix For: 2.3.0
>
>
> Between 1.6 and 2.0, the default behaviour for {{EXCEPT}} changed from
> {{EXCEPT ALL}} to {{EXCEPT DISTINCT}}. This is reasonable: postgres defaults
> to the same, and if you try and explicitly use {{EXCEPT ALL}} in 2.0 you get
> a good error message. However, the change was confusing to some users, so
> it's worth being explicit in the documentation.
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