viirya commented on a change in pull request #34246:
URL: https://github.com/apache/spark/pull/34246#discussion_r727612708
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File path:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/analysis/ResolveUnion.scala
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@@ -32,13 +32,28 @@ import org.apache.spark.sql.util.SchemaUtils
* Resolves different children of Union to a common set of columns.
*/
object ResolveUnion extends Rule[LogicalPlan] {
+ /**
+ * Transform the array of structs to the target struct type.
Review comment:
Can it be array of array of ... of struct?
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