jihoonson commented on a change in pull request #6094: Introduce SystemSchema 
tables (#5989)
URL: https://github.com/apache/incubator-druid/pull/6094#discussion_r223202782
 
 

 ##########
 File path: 
sql/src/main/java/org/apache/druid/sql/calcite/schema/DruidSchema.java
 ##########
 @@ -539,7 +553,18 @@ private static RowSignature analysisToRowSignature(final 
SegmentAnalysis analysi
 
       rowSignatureBuilder.add(entry.getKey(), valueType);
     }
-
     return rowSignatureBuilder.build();
   }
+
+  // note this is a mutable map accessed only by SystemSchema
 
 Review comment:
   Why does this need to be mutable? I don't see any places mutating this map.

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