clintropolis commented on PR #17623:
URL: https://github.com/apache/druid/pull/17623#issuecomment-2621031103

   >I don't think DataSource is api - its not marked with the 
[annotations](https://github.com/apache/druid/blob/e36e187a632ef1b3784a1c0f8b8048d2101070db/processing/src/main/java/org/apache/druid/query/DataSource.java#L53)
   
   >I haven't seen any implementations of it outside the core modules (except 
one in msq)
   in fact the current way things work; if someone would add a new datasource 
would have a pretty rough time running that on msq ; or having it work 
correctly in joins.
   
   >The issues I've seen can't be fixed without altering the Datasource api; 
unless I cheat with proxies/etc.
   
   Yea, i did this out of an abundance of caution on changing stuff on core 
APIs, you're right that `DataSource` isn't directly marked, but `Query` is, and 
queries have a `DataSource` so any custom query engines would likely need to be 
rebuilt to account for the signature change.
   
   That said, I think this change makes sense to make, so will approve after I 
finish reviewing, we just need to be sure to call it out in the dev oriented 
release notes.


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