Github user viirya commented on a diff in the pull request:
https://github.com/apache/spark/pull/16057#discussion_r90157966
--- Diff:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/analysis/TypeCoercion.scala
---
@@ -714,6 +714,17 @@ object TypeCoercion {
// try to find the first one we can implicitly cast.
case (_, TypeCollection(types)) => types.flatMap(implicitCast(e,
_)).headOption.orNull
+ case (ArrayType(_, nullable), ArrayType(internalType: DataType,
expectedNullable))
+ if (expectedNullable || nullable == expectedNullable) =>
--- End diff --
We should also consider the case forcing the casting result is null. Please
see
https://github.com/apache/spark/blob/7eb2ca8e338e04034a662920261e028f56b07395/sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/expressions/Cast.scala#L94
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