Github user ueshin commented on a diff in the pull request:
https://github.com/apache/spark/pull/22544#discussion_r220445443
--- Diff:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/analysis/TypeCoercion.scala
---
@@ -971,9 +971,38 @@ object TypeCoercion {
case (ArrayType(fromType, true), ArrayType(toType: DataType,
false)) => null
case (ArrayType(fromType, false), ArrayType(toType: DataType,
false))
- if !Cast.forceNullable(fromType, toType) =>
+ if !Cast.forceNullable(fromType, toType) =>
--- End diff --
nit: revert this change.
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