推荐列表merge fix

community-service/src/main/java/com/tanpu/community/service/RecommendService.java

@@ -169,7 +169,6 @@ public class RecommendService {
     // 按照 6,3,1的比例
     private List<String> mergeRecommend(List<String> hotIds, List<String> newestIds, List<String> recmdIds) {
         List<String> retList = new ArrayList<>();
-        HashSet<String> set = new HashSet<>();
         int round = 0;
         while (true) {
 
@@ -182,7 +181,6 @@ public class RecommendService {
             retList.addAll(BizUtils.subList(newestIds, newestStart, newRatio));
             retList.addAll(BizUtils.subList(hotIds, hotStart, hotRatio));
             retList.addAll(BizUtils.subList(recmdIds, recmdStart, pythonRatio));
-            set.addAll(retList);
 
             round++;
         }