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Posted to issues@spark.apache.org by "Apache Spark (JIRA)" <ji...@apache.org> on 2018/04/17 06:34:00 UTC
[jira] [Commented] (SPARK-23564) the optimized logical plan about
Left anti join should be further optimization
[ https://issues.apache.org/jira/browse/SPARK-23564?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16440476#comment-16440476 ]
Apache Spark commented on SPARK-23564:
--------------------------------------
User 'cloud-fan' has created a pull request for this issue:
https://github.com/apache/spark/pull/21083
> the optimized logical plan about Left anti join should be further optimization
> -------------------------------------------------------------------------------
>
> Key: SPARK-23564
> URL: https://issues.apache.org/jira/browse/SPARK-23564
> Project: Spark
> Issue Type: Improvement
> Components: SQL
> Affects Versions: 2.3.0
> Reporter: KaiXinXIaoLei
> Priority: Major
>
> The Optimized Logical Plan of the query '*select * from tt1 left anti join tt2 on tt2.i = tt1.i*' is
>
> {code:java}
> == Optimized Logical Plan ==
> Join LeftAnti, (i#2 = i#0)
> :- HiveTableRelation `default`.`tt1`, org.apache.hadoop.hive.serde2.lazy.LazySimpleSerDe, [i#0, s#1]
> +- Project [i#2]
> +- HiveTableRelation `default`.`tt2`, org.apache.hadoop.hive.serde2.lazy.LazySimpleSerDe, [i#2, s#3]
> {code}
>
>
> this plan can be further optimization by 'Filter isnotnull' of right table, as follow:
> {code:java}
> == Optimized Logical Plan ==
> Join LeftAnti, (i#2 = i#0)
> :- HiveTableRelation `default`.`tt1`, org.apache.hadoop.hive.serde2.lazy.LazySimpleSerDe, [i#0, s#1]
> +- Project [i#2]
> +- Filter isnotnull(i#3)
> +- HiveTableRelation `default`.`tt2`, org.apache.hadoop.hive.serde2.lazy.LazySimpleSerDe, [i#2, s#3]
> {code}
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