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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