LuciferYang commented on code in PR #40238:
URL: https://github.com/apache/spark/pull/40238#discussion_r1130353503


##########
connector/connect/common/src/main/protobuf/spark/connect/relations.proto:
##########
@@ -353,11 +353,16 @@ message LocalRelation {
   optional bytes data = 1;
 
   // (Optional) The schema of local data.
-  // It should be either a DDL-formatted type string or a JSON string.
   //
   // The server side will update the column names and data types according to 
this schema.
   // If the 'data' is not provided, then this schema will be required.
-  optional string schema = 2;
+  oneof schema {

Review Comment:
   Thanks @zhengruifeng 



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