Github user HyukjinKwon commented on a diff in the pull request: https://github.com/apache/spark/pull/21472#discussion_r192342580 --- 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 -- > Schema in DDL supports only `StructType` as root types. It is not possible to specify `MapType` like in the test: Shall we add the support with type itself with `CatalystSqlParser.parseDataType` too? Also, are you able to use `catalogString`?
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