feat:添加字段

recommend-feature-client/src/main/java/com/tzld/piaoquan/recommend/feature/domain/ad/base/AdRankItem.java

@@ -54,6 +54,8 @@ public class AdRankItem implements Comparable<AdRankItem> {
 
     private Map<String, String> featureMap = new HashMap<>();
 
+    private Map<String, Map<String, String>> metaFeatureMap = new HashMap<>();
+
     public AdRankItem() {
         // TODO
     }