Fix Go and Java SDK Regressions (feast-dev#729)

* Fix nil error cause by  adding items to a nil map in go SDK's client.GetOnlineFeatures()

* Fix issue where go sdk client.GetOnlineFeatures() does not return entity values

* Fixed issue where Row is unable to parse Value type due to proto package rename.

* Fix wrong path of test_feature python SDK test.

* Revert stub and channel private fields to final in FeastClient java SDK

Co-authored-by: Zhu Zhanyan <zhu.zhanyan@gojek.com>

sdk/go/client.go

@@ -52,7 +52,7 @@ func (fc *GrpcClient) GetOnlineFeatures(ctx context.Context, req *OnlineFeatures
 	resp, err := fc.cli.GetOnlineFeatures(ctx, featuresRequest)
 
 	// collect unqiue entity refs from entity rows
-	var entityRefs map[string]struct{}
+	entityRefs := make(map[string]struct{})
 	for _, entityRows := range req.Entities {
 		for ref, _ := range entityRows {
 			entityRefs[ref] = struct{}{}
@@ -61,17 +61,17 @@ func (fc *GrpcClient) GetOnlineFeatures(ctx context.Context, req *OnlineFeatures
 
 	// strip projects from to projects
 	for _, fieldValue := range resp.GetFieldValues() {
-		var stripFields map[string]*types.Value
+		stripFields := make(map[string]*types.Value)
 		for refStr, value := range fieldValue.Fields {
 			_, isEntity := entityRefs[refStr]
 			if !isEntity { // is feature ref
 				featureRef, err := parseFeatureRef(refStr, true)
 				if err != nil {
 					return nil, err
 				}
-				stripRefStr := toFeatureRefStr(featureRef)
-				stripFields[stripRefStr] = value
+				refStr = toFeatureRefStr(featureRef)
 			}
+			stripFields[refStr] = value
 		}
 		fieldValue.Fields = stripFields
 	}

sdk/go/types.go

@@ -21,12 +21,12 @@ func (r Row) equalTo(other Row) bool {
 	return true
 }
 
-// StrVal is a int64 type feast value
+// StrVal is a string type feast value
 func StrVal(val string) *types.Value {
 	return &types.Value{Val: &types.Value_StringVal{StringVal: val}}
 }
 
-// Int32Val is a int64 type feast value
+// Int32Val is a int32 type feast value
 func Int32Val(val int32) *types.Value {
 	return &types.Value{Val: &types.Value_Int32Val{Int32Val: val}}
 }

sdk/java/src/main/java/com/gojek/feast/FeastClient.java

@@ -23,6 +23,7 @@
 import feast.proto.serving.ServingAPIProto.GetOnlineFeaturesRequest.EntityRow;
 import feast.proto.serving.ServingAPIProto.GetOnlineFeaturesResponse;
 import feast.proto.serving.ServingServiceGrpc;
+import feast.proto.serving.ServingServiceGrpc.ServingServiceBlockingStub;
 import feast.proto.types.ValueProto.Value;
 import io.grpc.ManagedChannel;
 import io.grpc.ManagedChannelBuilder;
@@ -40,7 +41,7 @@ public class FeastClient implements AutoCloseable {
   private static final int CHANNEL_SHUTDOWN_TIMEOUT_SEC = 5;
 
   private final ManagedChannel channel;
-  private final ServingServiceGrpc.ServingServiceBlockingStub stub;
+  private final ServingServiceBlockingStub stub;
 
   /**
    * Create a client to access Feast
@@ -161,9 +162,9 @@ public List<Row> getOnlineFeatures(
         .collect(Collectors.toList());
   }
 
-  private FeastClient(ManagedChannel channel) {
+  protected FeastClient(ManagedChannel channel) {
     this.channel = channel;
-    stub = ServingServiceGrpc.newBlockingStub(channel);
+    this.stub = ServingServiceGrpc.newBlockingStub(channel);
   }
 
   public void close() throws Exception {

sdk/java/src/main/java/com/gojek/feast/Row.java

@@ -76,7 +76,7 @@ public Row set(String fieldName, Object value) {
         fields.put(
             fieldName, Value.newBuilder().setBytesVal(ByteString.copyFrom((byte[]) value)).build());
         break;
-      case "feast.types.ValueProto.Value":
+      case "feast.proto.types.ValueProto.Value":
         fields.put(fieldName, (Value) value);
         break;
       default:

sdk/python/feast/test_feature.py → sdk/python/tests/test_feature.py

@@ -17,7 +17,7 @@
 
 class TestFeatureRef:
     def test_str_ref(self):
-        original_ref = FeatureRef(project="test", name="test")
+        original_ref = FeatureRef(feature_set="test", name="test")
         ref_str = repr(original_ref)
         parsed_ref = FeatureRef.from_str(ref_str)
         assert original_ref == parsed_ref