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Posted to issues@spark.apache.org by "Apache Spark (Jira)" <ji...@apache.org> on 2022/05/13 05:01:00 UTC
[jira] [Assigned] (SPARK-39172) Remove outer join if all output come from streamed side and buffered side keys exist unique key
[ https://issues.apache.org/jira/browse/SPARK-39172?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Apache Spark reassigned SPARK-39172:
------------------------------------
Assignee: (was: Apache Spark)
> Remove outer join if all output come from streamed side and buffered side keys exist unique key
> -----------------------------------------------------------------------------------------------
>
> Key: SPARK-39172
> URL: https://issues.apache.org/jira/browse/SPARK-39172
> Project: Spark
> Issue Type: Improvement
> Components: SQL
> Affects Versions: 3.4.0
> Reporter: XiDuo You
> Priority: Major
>
> Improve the optimzation case using the distinct keys framework.
> For example:
> {code:java}
> SELECT t1.* FROM t1 LEFT JOIN (SELECT distinct c1 as c1 FROM t)t2 ON t1.c1 = t2.c1
> ==>
> SELECT t1.* FROM t1 {code}
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