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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