use sum type in protobuf query

proto/vulcanize/registry/v1beta1/query.proto

@@ -67,17 +67,25 @@ message QueryParamsResponse {
 
 // QueryListRecordsRequest is request type for registry records list
 message QueryListRecordsRequest {
-  message ReferenceInput {
+  message LinkInput {
     string id = 1;
   }
+  message ArrayInput {
+    repeated ValueInput values = 1;
+  }
+  message MapInput {
+    map<string, ValueInput> values = 1;
+  }
   message ValueInput {
-    string type                   = 1;
-    string string                 = 2;
-    int64 int                     = 3;
-    double float                  = 4;
-    bool                boolean   = 5;
-    ReferenceInput      reference = 6;
-    repeated ValueInput values    = 7;
+    oneof value {
+      string string    = 1;
+      int64 int        = 2;
+      double float     = 3;
+      bool boolean     = 4;
+      string link      = 5;
+      ArrayInput array = 6;
+      MapInput map     = 7;
+    }
   }
   message KeyValueInput {
     string     key   = 1;

x/registry/keeper/keeper.go

@@ -179,22 +179,26 @@ func (k Keeper) RecordsFromAttributes(ctx sdk.Context, attributes []*types.Query
 }
 
 func GetAttributeValue(input *types.QueryListRecordsRequest_ValueInput) interface{} {
-	if input.Type == "int" {
-		return input.GetInt()
+	switch value := input.GetValue().(type) {
+	case *types.QueryListRecordsRequest_ValueInput_String_:
+		return value.String_
+	case *types.QueryListRecordsRequest_ValueInput_Int:
+		return value.Int
+	case *types.QueryListRecordsRequest_ValueInput_Float:
+		return value.Float
+	case *types.QueryListRecordsRequest_ValueInput_Boolean:
+		return value.Boolean
+	case *types.QueryListRecordsRequest_ValueInput_Link:
+		return value.Link
+	case *types.QueryListRecordsRequest_ValueInput_Array:
+		return value.Array
+	case *types.QueryListRecordsRequest_ValueInput_Map:
+		return value.Map
+	case nil:
+		return nil
+	default:
+		return fmt.Errorf("Value has unepxpected type %T", value)
 	}
-	if input.Type == "float" {
-		return input.GetFloat()
-	}
-	if input.Type == "string" {
-		return input.GetString_()
-	}
-	if input.Type == "boolean" {
-		return input.GetBoolean()
-	}
-	if input.Type == "reference" {
-		return input.GetReference().GetId()
-	}
-	return nil
 }
 
 func getIntersection(a []string, b []string) []string {