Github user dilipbiswal commented on a diff in the pull request: https://github.com/apache/spark/pull/22544#discussion_r220766294 --- Diff: sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/analysis/TypeCoercion.scala --- @@ -974,6 +974,25 @@ object TypeCoercion { if !Cast.forceNullable(fromType, toType) => implicitCast(fromType, toType).map(ArrayType(_, false)).orNull + // Implicit cast between Map types. + // Follows the same semantics of implicit casting between two array types. + // Refer to documentation above. Make sure that both key and values + // can not by null after the implicit cast operation by calling forceNullable --- End diff -- @viirya Thank you.
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