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https://issues.apache.org/jira/browse/SPARK-27671?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16838795#comment-16838795
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Dongjoon Hyun commented on SPARK-27671:
---------------------------------------
The patch can land on `master` and `branch-2.4`. From branch-2.3, we need more
patches. So, it's not feasible to backport.
> Fix error when casting from a nested null in a struct
> -----------------------------------------------------
>
> Key: SPARK-27671
> URL: https://issues.apache.org/jira/browse/SPARK-27671
> Project: Spark
> Issue Type: Bug
> Components: SQL
> Affects Versions: 3.0.0, 2.4.3
> Reporter: Liang-Chi Hsieh
> Priority: Major
>
> When a null in a nested field in struct, casting from the struct throws
> error, currently.
> {code}
> scala> sql("select cast(struct(1, null) as struct<a:int,b:int>)").show
> scala.MatchError: NullType (of class org.apache.spark.sql.types.NullType$)
>
> at org.apache.spark.sql.catalyst.expressions.Cast.castToInt(Cast.scala:447)
>
> at org.apache.spark.sql.catalyst.expressions.Cast.cast(Cast.scala:635)
>
> at
> org.apache.spark.sql.catalyst.expressions.Cast.$anonfun$castStruct$1(Cast.scala:603)
>
> {code}
> {code}
> scala> sql("select * FROM VALUES (('a', (10, null))), (('b', (10, 50))),
> (('c', null)) AS tab(x, y)").show
> org.apache.spark.sql.AnalysisException: failed to evaluate expression
> named_struct('col1', 10, 'col2', NULL): NullType (of class
> org.apache.spark.sql.t
> ypes.NullType$); line 1 pos 14
>
> at
> org.apache.spark.sql.catalyst.analysis.package$AnalysisErrorAt.failAnalysis(package.scala:47)
>
> at
> org.apache.spark.sql.catalyst.analysis.ResolveInlineTables.$anonfun$convert$6(ResolveInlineTables.scala:106)
>
> {code}
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