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https://issues.apache.org/jira/browse/FLINK-4591?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15472401#comment-15472401
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Jark Wu commented on FLINK-4591:
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It seems that {{GROUP BY *}} is not allowed in SQL. Maybe we can throw a
better exception to explain this when user use star in groupBy. Currently, the
exception is "cannot resolve [*] given input [a, b, c]" which is not clear.
> Select star does not work with grouping
> ---------------------------------------
>
> Key: FLINK-4591
> URL: https://issues.apache.org/jira/browse/FLINK-4591
> Project: Flink
> Issue Type: Improvement
> Components: Table API & SQL
> Reporter: Timo Walther
>
> It would be consistent if this would also work:
> {{table.groupBy('*).select("*)}}
> Currently, the star only works in a plain select without grouping.
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