Github user HyukjinKwon commented on a diff in the pull request:
https://github.com/apache/spark/pull/22226#discussion_r214844675
--- Diff:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/expressions/jsonExpressions.scala
---
@@ -685,33 +679,29 @@ case class StructsToJson(
(row: Any) =>
--- End diff --
`child.dataType` -> `intputSchema`
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