LuciferYang commented on code in PR #47415:
URL: https://github.com/apache/spark/pull/47415#discussion_r1684040316


##########
connect/server/src/main/scala/org/apache/spark/sql/connect/planner/SparkConnectPlanner.scala:
##########
@@ -2189,6 +2155,19 @@ class SparkConnectPlanner(
     case other => throw InvalidPlanInput(s"$field should be created by map, 
but got $other")
   }
 
+  // Check whether this proto expression is a literal string representing a 
JSON-formatted schema
+  private def isJsonSchema(exp: proto.Expression): Boolean = {
+    exp.getExprTypeCase match {
+      case proto.Expression.ExprTypeCase.LITERAL =>
+        exp.getLiteral.getLiteralTypeCase match {
+          case proto.Expression.Literal.LiteralTypeCase.STRING =>
+            Try { DataType.fromJson(exp.getLiteral.getString) }.isSuccess

Review Comment:
   Are the results of 
   ```scala
   DataType.fromJson(exp.getLiteral.getString)
   ```
   and
   
   ```scala
   DataType.fromJson(extractString(children(1), "schema"))
   ```
   
   the same? Is it possible to save one one invocation of `DataType.fromJson`?



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