Github user cloud-fan commented on a diff in the pull request:
https://github.com/apache/spark/pull/13704#discussion_r68885567
--- Diff:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/expressions/Cast.scala
---
@@ -837,8 +837,36 @@ case class Cast(child: Expression, dataType: DataType)
extends UnaryExpression w
val j = ctx.freshName("j")
val values = ctx.freshName("values")
+ val isPrimitiveFrom = ctx.isPrimitiveType(fromType)
--- End diff --
we need to make sure the input array's element nullability is false, but
primitive type array doesn't guarantee it. e.g. we can have
`ArrayType(ByteType, true)`
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