clintropolis commented on a change in pull request #11895:
URL: https://github.com/apache/druid/pull/11895#discussion_r745496938



##########
File path: 
processing/src/main/java/org/apache/druid/query/metadata/metadata/ColumnAnalysis.java
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@@ -47,6 +50,7 @@ public static ColumnAnalysis error(String reason)
 
   @JsonCreator
   public ColumnAnalysis(
+      @JsonProperty("typeSignature") ColumnType typeSignature,

Review comment:
       if we supported updating the broker before data servers then we might 
wan't to consider that, but we don't (so that new query types, filters, 
aggregators, etc cannot be issued before data servers can understand them)




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