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https://issues.apache.org/jira/browse/SPARK-32464?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17166071#comment-17166071
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Wang, Gang commented on SPARK-32464:
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A PR [https://github.com/apache/spark/pull/29266]
> Support skew handling on join that has one side with no query stage
> -------------------------------------------------------------------
>
> Key: SPARK-32464
> URL: https://issues.apache.org/jira/browse/SPARK-32464
> Project: Spark
> Issue Type: Improvement
> Components: SQL
> Affects Versions: 3.0.0
> Reporter: Wang, Gang
> Priority: Major
>
> In our production environment, there are many bucket tables, which are used
> to join with other tables. And there are some skewed joins now and then.
> While, in current implementation, the skew join handling can only applied
> when both sides of a SMJ are QueryStages. So skew join handling is not able
> to deal with such cases.
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