Github user HyukjinKwon commented on a diff in the pull request: https://github.com/apache/spark/pull/21472#discussion_r192379878 --- Diff: sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/expressions/jsonExpressions.scala --- @@ -747,8 +748,13 @@ case class StructsToJson( object JsonExprUtils { - def validateSchemaLiteral(exp: Expression): StructType = exp match { - case Literal(s, StringType) => CatalystSqlParser.parseTableSchema(s.toString) + def validateSchemaLiteral(exp: Expression): DataType = exp match { + case Literal(s, StringType) => + try { + DataType.fromJson(s.toString) --- End diff -- I mean, type string support by `CatalystSqlParser.parseDataType` (like array<...> or struct<...>) into `from_json`. This will support `struct<a:int>` if I am not mistaken.
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