imply-cheddar commented on code in PR #13085:
URL: https://github.com/apache/druid/pull/13085#discussion_r997622663


##########
sql/src/main/java/org/apache/druid/sql/calcite/external/ExternalDataSource.java:
##########
@@ -141,7 +141,7 @@ public DataSource withUpdatedDataSource(DataSource 
newSource)
   @Override
   public byte[] getCacheKey()
   {
-    return null;
+    return new byte[0];

Review Comment:
   Basically, yes.  I had forgotten about that method.  In some future, we 
should refactor to completely eliminate the method...  But let's not take that 
on yet.



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