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https://issues.apache.org/jira/browse/SPARK-28557?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16925673#comment-16925673
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Gengliang Wang commented on SPARK-28557:
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Is this duplicated with https://issues.apache.org/jira/browse/SPARK-28409?
> Support empty select list
> -------------------------
>
> Key: SPARK-28557
> URL: https://issues.apache.org/jira/browse/SPARK-28557
> Project: Spark
> Issue Type: Sub-task
> Components: SQL
> Affects Versions: 3.0.0
> Reporter: Yuming Wang
> Priority: Major
>
> Examples:
> {code:sql}
> select union select;
> select intersect select;
> select except select;
> {code}
> https://github.com/postgres/postgres/blob/REL_12_BETA2/src/test/regress/sql/union.sql#L193-L199
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