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https://issues.apache.org/jira/browse/SPARK-32521?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Apache Spark reassigned SPARK-32521:
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Assignee: Apache Spark
> WithFields Expression should not be foldable
> --------------------------------------------
>
> Key: SPARK-32521
> URL: https://issues.apache.org/jira/browse/SPARK-32521
> Project: Spark
> Issue Type: Bug
> Components: SQL
> Affects Versions: 3.1.0
> Reporter: fqaiser94
> Assignee: Apache Spark
> Priority: Major
>
> The following query currently fails on master brach:
> {code:scala}
> sql("SELECT named_struct('a', 1, 'b', 2) a")
> .select($"a".withField("c", lit(3)).as("a"))
> .show(false)
> // java.lang.UnsupportedOperationException: Cannot evaluate expression:
> with_fields(named_struct(a, 1, b, 2), c, 3)
> {code}
> This happens because the Catalyst optimizer tries to statically evaluate the
> {{WithFields Expression}} (via the {{ConstantFolding}} rule), however it
> cannot do so because {{WithFields Expression}} is {{Unevaluable}}.
> The likely solution here is to change {{WithFields Expression}} so that it is
> not {{foldable}} under any circumstance. This should solve the issue because
> then Catalyst will no longer attempt to statically evaluate {{WithFields
> Expression}} anymore.
>
>
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