[GitHub] [incubator-pinot] xiaohui-sun commented on a change in pull request #4313: [TE] Use multimap in metric urn as dimension

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xiaohui-sun commented on a change in pull request #4313: [TE] Use multimap in metric urn as dimension
URL: https://github.com/apache/incubator-pinot/pull/4313#discussion_r293619539
 
 

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 File path: thirdeye/thirdeye-pinot/src/main/java/org/apache/pinot/thirdeye/detection/DetectionUtils.java
 ##########
 @@ -55,8 +56,8 @@
   // TODO anomaly should support multimap
   public static DimensionMap toFilterMap(Multimap<String, String> filters) {
     DimensionMap map = new DimensionMap();
-    for (Map.Entry<String, String> entry : filters.entries()) {
-      map.put(entry.getKey(), entry.getValue());
+    for (Map.Entry<String, Collection<String>> entry: filters.asMap().entrySet()){
+      map.put(entry.getKey(), String.join(", ", entry.getValue()));
 
 Review comment:
   Any reason use ", " instead of ","?

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