[GitHub] [spark] WeichenXu123 commented on a diff in pull request #39985: [SPARK-42412][WIP] Initial prototype implementation of PySpark ML via Spark connect

["WeichenXu123 (via GitHub)" <gi...@apache.org>]

WeichenXu123 commented on code in PR #39985:
URL: https://github.com/apache/spark/pull/39985#discussion_r1104451588


##########
connector/connect/common/src/main/protobuf/spark/connect/ml.proto:
##########
@@ -0,0 +1,165 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements.  See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to You under the Apache License, Version 2.0
+ * (the "License"); you may not use this file except in compliance with
+ * the License.  You may obtain a copy of the License at
+ *
+ *    http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+syntax = 'proto3';
+
+package spark.connect;
+
+import "spark/connect/relations.proto";
+
+option java_multiple_files = true;
+option java_package = "org.apache.spark.connect.proto";
+
+
+message RemoteCall {
+  oneof call_type {
+    ConstructObject construct_object = 1;
+    DestructObject destruct_object = 2;
+    CallMethod call_method = 3;
+    CallFunction call_function = 4;
+  }
+
+  message ArgValue {
+    oneof arg_type {
+      int32 int32_value = 1;
+      int64 int64_value = 2;
+      float float_value = 3;
+      double double_value = 4;
+      bool bool_value = 5;
+      string string_value = 6;
+      List list = 7;
+      Map map = 8;
+      Relation relation = 9;
+      RemoteObject remote_object = 10;
+    }
+  }
+
+  message List {
+    repeated ArgValue element = 1;
+  }
+  message Map {
+    map<string, ArgValue> map = 1;
+  }
+  message RemoteObject {
+    string id = 1;
+  }
+
+  message ConstructObject {
+    string className = 1;
+    repeated ArgValue values = 2;
+  }
+
+  message DestructObject {
+    RemoteObject remote_object = 1;
+  }
+
+  message CallMethod {
+    RemoteObject remote_object = 1;
+    string method_name = 2;
+    repeated ArgValue arg_values = 3;
+  }
+
+  message CallFunction {
+    string module_name = 1;
+    repeated ArgValue arg_values = 3;
+  }
+}
+
+
+message MlCommand {

Review Comment:
   Note:
   The PR is WIP,
   and I will remove the whole `MlCommand` message definition in following commits, we only need the `RemoteCall` message for ML cases.
   



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