kgyrtkirk commented on code in PR #16738:
URL: https://github.com/apache/druid/pull/16738#discussion_r1683942555


##########
processing/src/main/java/org/apache/druid/query/rowsandcols/ArrayListRowsAndColumns.java:
##########
@@ -212,15 +212,8 @@ public <T> T as(Class<T> clazz)
   @Override
   public void addColumn(String name, Column column)
   {
-    if (rows.size() == numRows()) {
-      extraColumns.put(name, column);
-      columnNames.add(name);
-      return;
-    }
-

Review Comment:
   instead of removing it entirely - possibly a check would be nice to ensure 
that only columns which `ColumnValueSwapper` gets added like  that.
   
   



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