Github user guoyuepeng commented on a diff in the pull request:
https://github.com/apache/incubator-griffin/pull/442#discussion_r227272894
--- Diff:
service/src/main/java/org/apache/griffin/core/measure/entity/Rule.java ---
@@ -81,6 +81,9 @@ Licensed to the Apache Software Foundation (ASF) under one
@Column(name = "\"out\"")
private String out;
+ @JsonInclude(JsonInclude.Include.NON_NULL)
--- End diff --
@bhlx3lyx7 should we make this optional from service side?---
