Github user dilipbiswal commented on a diff in the pull request: https://github.com/apache/spark/pull/22544#discussion_r220250631 --- Diff: sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/analysis/TypeCoercion.scala --- @@ -971,9 +971,36 @@ 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) => implicitCast(fromType, toType).map(ArrayType(_, false)).orNull + // Implicit cast between Map types. --- End diff -- @viirya actually i followed the arraytype example. Actually it has decent coverage, i think. If you can think of a case thats missing , i will add. I will also go through once again myself.
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