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Posted to issues@spark.apache.org by "Apache Spark (Jira)" <ji...@apache.org> on 2023/03/22 14:23:00 UTC
[jira] [Commented] (SPARK-42897) Avoid evaluate more than once for the variables from the left side in the FullOuter SMJ condition
[ https://issues.apache.org/jira/browse/SPARK-42897?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17703686#comment-17703686 ]
Apache Spark commented on SPARK-42897:
--------------------------------------
User 'wankunde' has created a pull request for this issue:
https://github.com/apache/spark/pull/40523
> Avoid evaluate more than once for the variables from the left side in the FullOuter SMJ condition
> -------------------------------------------------------------------------------------------------
>
> Key: SPARK-42897
> URL: https://issues.apache.org/jira/browse/SPARK-42897
> Project: Spark
> Issue Type: Improvement
> Components: SQL
> Affects Versions: 3.4.0
> Reporter: Wan Kun
> Priority: Minor
>
> Codegen issue for FullOuter SMJ, for example
> {code}
> val df1 = spark.range(5).select($"id".as("k1"))
> val df2 = spark.range(10).select($"id".as("k2"))
> df1.join(df2.hint("SHUFFLE_MERGE"),
> $"k1" === $"k2" % 3 && $"k1" + 3 =!= $"k2" && $"k1" + 5 =!= $"k2", "full_outer")
> {code}
> the join condition *$"k1" + 3 =!= $"k2" && $"k1" + 5 =!= $"k2"* both will evaluate the variable *k1* and caused the codegen failed.
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