yurmix commented on issue #6519: Lookups should be able to return list of values URL: https://github.com/apache/incubator-druid/issues/6519#issuecomment-440002615 I've done some initial initial investigation. In addition to extending `apply()`, it will also require a change to `MapLookupExtractor` and `MapLookupExtractorFactory` and places where these classes are being used (such as `NamespaceLookupExtractorFactory`): ```java public class MapLookupExtractor extends LookupExtractor { private final Map<String, String> map; // // public Map<String, String> getMap() { return ImmutableMap.copyOf(map); // // ```
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