Github user HyukjinKwon commented on a diff in the pull request: https://github.com/apache/spark/pull/18875#discussion_r132875025 --- Diff: sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/expressions/jsonExpressions.scala --- @@ -676,7 +687,8 @@ case class StructsToJson( TypeCheckResult.TypeCheckFailure(e.getMessage) } case _ => TypeCheckResult.TypeCheckFailure( - s"Input type ${child.dataType.simpleString} must be a struct or array of structs.") + s"Input type ${child.dataType.simpleString} must be a struct, array of structs or " + + s"map with a structs value.") --- End diff -- little nit: `s` looks not required.
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