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From "Henry Robinson (JIRA)" <j...@apache.org>
Subject [jira] [Created] (SPARK-23062) EXCEPT documentation should make it clear that it's EXCEPT DISTINCT
Date Sat, 13 Jan 2018 00:05:00 GMT
Henry Robinson created SPARK-23062:
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             Summary: 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
            Priority: Trivial


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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