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https://issues.apache.org/jira/browse/SPARK-42513?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17691896#comment-17691896
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Apache Spark commented on SPARK-42513:
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User 'wangyum' has created a pull request for this issue:
https://github.com/apache/spark/pull/40114
> Push down topK through join
> ---------------------------
>
> Key: SPARK-42513
> URL: https://issues.apache.org/jira/browse/SPARK-42513
> Project: Spark
> Issue Type: Improvement
> Components: SQL
> Affects Versions: 3.4.0
> Reporter: Yuming Wang
> Priority: Major
> Attachments: after-UI.png, before-UI.png
>
>
> {code:scala}
> spark.range(100000000).selectExpr("id % 10000 as a", "id as
> b").write.saveAsTable("t1")
> spark.range(100000000).selectExpr("id % 10000 as x", "id as
> y").write.saveAsTable("t2")
> sql("select * from t1 left join t2 on a = x order by b limit 5").collect()
> spark.sql("set
> spark.sql.optimizer.excludedRules=org.apache.spark.sql.catalyst.optimizer.LimitPushDown")
> sql("select * from t1 left join t2 on a = x order by b limit 5").collect()
> {code}
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