edmondop commented on code in PR #805:
URL: https://github.com/apache/datafusion-comet/pull/805#discussion_r1724944483


##########
spark/src/main/scala/org/apache/comet/serde/QueryPlanSerde.scala:
##########
@@ -1210,6 +1210,58 @@ object QueryPlanSerde extends Logging with 
ShimQueryPlanSerde with CometExprShim
             None
           }
 
+        case StructsToJson(options, child, timezoneId) =>
+          if (options.nonEmpty) {
+            withInfo(expr, "StructsToJson with options is not supported")
+            None
+          } else {
+
+            def isSupportedType(dt: DataType): Boolean = {
+              dt match {
+                case StructType(fields) =>
+                  fields.forall(f => isSupportedType(f.dataType))
+                case DataTypes.BooleanType | DataTypes.ByteType | 
DataTypes.ShortType |
+                    DataTypes.IntegerType | DataTypes.LongType | 
DataTypes.FloatType |
+                    DataTypes.DoubleType | DataTypes.StringType =>
+                  true
+                case DataTypes.DateType | DataTypes.TimestampType =>
+                  // TODO implement these types with tests for formatting 
options and timezone
+                  false
+                case _ => false
+              }
+            }
+
+            val isSupported = child.dataType match {
+              case s: StructType =>
+                s.fields.forall(f => isSupportedType(f.dataType))
+              case _ =>

Review Comment:
   I think @eejbyfeldt point is correct.  Map and Arrays can effectively be 
jsonified, but they are not `StructType` and we need to extend the pattern 
matching to support those
   
   



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