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https://issues.apache.org/jira/browse/SPARK-19420?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15848058#comment-15848058
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Apache Spark commented on SPARK-19420:
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User 'gatorsmile' has created a pull request for this issue:
https://github.com/apache/spark/pull/16762
> Confusing error message when using outer join on two large tables
> -----------------------------------------------------------------
>
> Key: SPARK-19420
> URL: https://issues.apache.org/jira/browse/SPARK-19420
> Project: Spark
> Issue Type: Bug
> Components: SQL
> Affects Versions: 2.1.0
> Reporter: Xiao Li
> Assignee: Xiao Li
>
> When users use the outer joins where both sides of the tables are too large
> to be broadcasted, Spark will still select `BroadcastNestedLoopJoin`. CROSS
> JOIN syntax is unable to cover the scenario of outer join, but we still issue
> the following error message:
> {noformat}
> Use the CROSS JOIN syntax to allow cartesian products between these relations
> {noformat}
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