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https://issues.apache.org/jira/browse/SPARK-28654?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Wenchen Fan resolved SPARK-28654.
---------------------------------
Resolution: Fixed
Fix Version/s: 3.0.0
Issue resolved by pull request 25386
[https://github.com/apache/spark/pull/25386]
> Move "Extract Python UDFs" to the last in optimizer
> ---------------------------------------------------
>
> Key: SPARK-28654
> URL: https://issues.apache.org/jira/browse/SPARK-28654
> Project: Spark
> Issue Type: Improvement
> Components: SQL
> Affects Versions: 3.0.0
> Reporter: Hyukjin Kwon
> Assignee: Hyukjin Kwon
> Priority: Major
> Fix For: 3.0.0
>
>
> Plans after "Extract Python UDFs" are very flaky and error-prone to other
> plans. For instance,
> if we add some rules, for instance, [{PushDownPredicates}},
> The optimization is rolled back as below:
> {code}
> === Applying Rule org.apache.spark.sql.catalyst.optimizer.PushDownPredicates
> ===
> !Filter (dummyUDF(a#7, c#18) = dummyUDF(d#19, c#18)) Join Cross,
> (dummyUDF(a#7, c#18) = dummyUDF(d#19, c#18))
> !+- Join Cross :- Project [_1#2 AS
> a#7, _2#3 AS b#8]
> ! :- Project [_1#2 AS a#7, _2#3 AS b#8] : +- LocalRelation
> [_1#2, _2#3]
> ! : +- LocalRelation [_1#2, _2#3] +- Project [_1#13 AS
> c#18, _2#14 AS d#19]
> ! +- Project [_1#13 AS c#18, _2#14 AS d#19] +- LocalRelation
> [_1#13, _2#14]
> ! +- LocalRelation [_1#13, _2#14]
> {code}
> Seems we should do Python UDFs cases at the last even after post hoc rules.
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