LakshSingla commented on code in PR #15869:
URL: https://github.com/apache/druid/pull/15869#discussion_r1482844384


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sql/src/main/java/org/apache/druid/sql/http/ResultFormat.java:
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@@ -133,7 +134,10 @@ public interface Writer extends Closeable
 
     void writeHeader(RelDataType rowType, boolean includeTypes, boolean 
includeSqlTypes) throws IOException;
 
-    void writeHeaderFromRowSignature(RowSignature rowSignature, boolean 
includeTypes) throws IOException;
+    default void writeHeaderFromRowSignature(RowSignature rowSignature, 
boolean includeTypes) throws IOException

Review Comment:
   Also, a better default implementation would be deferring the call to 
`writeHeader`, after constructing a `RelDataType` from `rowType`. The types 
should be omitted since that would be ambiguous (a single `ColumnType` can to 
multiple `RelDataType`).
   However, as per the previous comment, I am in favor of removing the default 
implementation altogether and leaving it as is.



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