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https://issues.apache.org/jira/browse/SPARK-22826?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Apache Spark reassigned SPARK-22826:
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Assignee: (was: Apache Spark)
> [SQL] findWiderTypeForTwo Fails over StructField of Array
> ---------------------------------------------------------
>
> Key: SPARK-22826
> URL: https://issues.apache.org/jira/browse/SPARK-22826
> Project: Spark
> Issue Type: Bug
> Components: SQL
> Affects Versions: 2.3.0
> Reporter: Aleksander Eskilson
>
> The {{findWiderTypeForTwo}} codepath in Catalyst {{TypeCoercion}} fails when
> applied to to {{StructType}} having the following fields:
> {noformat}
> StructType(StructField("a", ArrayType(StringType, containsNull=true))
> :: Nil),
> StructType(StructField("a", ArrayType(StringType, containsNull=false))
> :: Nil)
> {noformat}
> When in {{findTightestCommonType}}, the function attempts to recursively find
> the tightest common type of two arrays. These two arrays are not equal types
> (since one would admit null elements and the other would not), but
> {{findTightestCommonType}} has no match case for {{ArrayType}} (or
> {{MapType}}), so the
> [get|https://github.com/apache/spark/blob/master/sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/analysis/TypeCoercion.scala#L108]
> operation on the dataType of the {{StructField}} throws a
> {{NoSuchElementException}}.
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