Github user gengliangwang commented on a diff in the pull request: https://github.com/apache/spark/pull/21439#discussion_r192465130 --- Diff: sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/expressions/jsonExpressions.scala --- @@ -548,7 +553,9 @@ case class JsonToStructs( forceNullableSchema = SQLConf.get.getConf(SQLConf.FROM_JSON_FORCE_NULLABLE_SCHEMA)) override def checkInputDataTypes(): TypeCheckResult = nullableSchema match { - case _: StructType | ArrayType(_: StructType, _) | _: MapType => + case ArrayType(_: StructType, _) if unpackArray => --- End diff -- Even if `unpackArray` is `false`, the next branch in line 558 still do `super.checkInputDataTypes()` for any `ArrayType`
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