abhishekrb19 commented on code in PR #14560:
URL: https://github.com/apache/druid/pull/14560#discussion_r1261502281


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processing/src/main/java/org/apache/druid/query/metadata/SegmentMetadataQueryQueryToolChest.java:
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@@ -254,10 +256,10 @@ public <T extends LogicalSegment> List<T> 
filterSegments(SegmentMetadataQuery qu
 
   @VisibleForTesting
   public static SegmentAnalysis mergeAnalyses(
-      @Nullable String dataSource,
+      Set<String> dataSources,

Review Comment:
   yeah, this is for `UnionDataSource` - previously, the caller was passing 
only the first one 
[here](https://github.com/apache/druid/pull/14560/files#diff-acc53e0e891879963c30d5c8b349347f6b7d96c0560992a3c8fe1f9f3d2ddd3bL142).
 Now we pass in all the datasources and determine the datasource in this 
function



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