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https://issues.apache.org/jira/browse/SPARK-24966?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16564772#comment-16564772
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Apache Spark commented on SPARK-24966:
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User 'dilipbiswal' has created a pull request for this issue:
https://github.com/apache/spark/pull/21941
> Fix the precedence rule for set operations.
> -------------------------------------------
>
> Key: SPARK-24966
> URL: https://issues.apache.org/jira/browse/SPARK-24966
> Project: Spark
> Issue Type: Bug
> Components: SQL
> Affects Versions: 2.3.1
> Reporter: Dilip Biswal
> Priority: Major
>
> Currently the set operations INTERSECT, UNION and EXCEPT are assigned the
> same precedence. We need to change to make sure INTERSECT is given higher
> precedence than UNION and EXCEPT. UNION and EXCEPT should be evaluated in the
> order they appear in the query from left to right.
> Given this will result in a change in behavior, we need to keep it under a
> config.
> Here is a reference :
> https://docs.microsoft.com/en-us/sql/t-sql/language-elements/set-operators-except-and-intersect-transact-sql?view=sql-server-2017
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