Remove historical feature in serving store

protos/feast/serving/Serving.proto

@@ -26,73 +26,37 @@ option java_outer_classname = "ServingAPIProto";
 option go_package = "github.com/gojek/feast/protos/generated/go/feast/serving";
 
 service ServingAPI {
-    // Query features from Feast
-    rpc QueryFeatures (QueryFeatures.Request) returns (QueryFeatures.Response) {};
+    // Query features from Feast serving storage
+    rpc QueryFeatures (QueryFeaturesRequest) returns (QueryFeaturesResponse) {};
 }
 
-message QueryFeatures {
-    message Request {
-        // e.g. "driver", "customer", "city".
-        string entityName = 1;
-        // List of entity ID.
-        repeated string entityId = 2;
-        // List of request details, contains: featureId, type of query, and limit.
-        repeated RequestDetail requestDetails = 3;
-        // Filter specifying only to retrieve features having timestamp within this range.
-        TimestampRange timestampRange = 4;
-    }
-
-    message Response {
-        // e.g. "driver", "customer", "city".
-        string entityName = 1;
-        // map of entity ID and its entity's properties.
-        map<string, Entity> entities = 2;
-    }
-}
-
-message RequestDetail {
-    // feature ID to be included in the query.
+message QueryFeaturesRequest {
+    // e.g. "driver", "customer", "city".
+    string entityName = 1;
+    // List of entity ID.
+    repeated string entityId = 2;
+    // List of feature ID.
     // feature ID is in the form of [entity_name].[granularity].[feature_name]
     // e.g: "driver.day.total_accepted_booking"
     // all requested feature ID shall have same entity name.
-    string featureId = 1;
-    // request type either LAST or LIST.
-    // LAST : return only the latest value based on timestamp.
-    // LIST : return list of historical data sorted by timestamp.
-    RequestType type = 2;
-    // only applicable to LIST.
-    // length of the returned list <= limit.
-    // default = 0
-    int32 limit = 3;
-}
-
-enum RequestType {
-    // LAST : return only the latest value based on timestamp. (default)
-    LAST = 0;
-    // LIST : return list of historical data sorted by timestamp.
-    LIST = 1;
+    repeated string featureId = 3;
 }
 
-// range of timestamp for querying
-// valid timestamp range is having start <= end
-message TimestampRange {
-    // start time of the range query.
-    google.protobuf.Timestamp start = 1;
-    // end time of the range query.
-    google.protobuf.Timestamp end = 2;
+message QueryFeaturesResponse {
+    // Entity name of the response
+    string entityName = 1;
+    // map of entity ID and its entity's properties.
+    map<string, Entity> entities = 2;
 }
 
 message Entity {
     // map of feature ID and its feature value.
-    map<string, FeatureValueList> features = 1;
+    map<string, FeatureValue> features = 1;
 }
 
-message FeatureValueList {
-    // list of feature value
-    // if "type" in "requestDetail" is "LAST", then the length will always be 1.
-    // if "type" in "requestDetail" is "LIST", then the length is <= "limit".
-    feast.types.ValueList valueList = 1;
-    // list of timestamp of the value.
-    // the i-th timestamps correspond to the i-th value.
-    feast.types.TimestampList timestampList = 2;
+message FeatureValue {
+    // value of feature
+    feast.types.Value value = 1;
+    // timestamp of the feature
+    google.protobuf.Timestamp timestamp = 2;
 }