davecromberge commented on issue #12448:
URL: https://github.com/apache/pinot/issues/12448#issuecomment-1961400180

   @snleee we do not plan to support CDC directly through this interface.  This 
issue is more about using Flink to build segments and upload them directly to 
the controller with the intention of giving the user more control over the 
ingestion process.  
   Whilst a delta lake might support the operations you mention, we only 
currently support INSERT/append through our connector.  In some sense, we are 
tackling this problem in increments - eventually we will have to consider the 
delta lake semantics and synchronise the state between Pinot and the Delta lake 
by one of the two methods you describe.  However, this is out of scope for the 
issue here which is narrowed to Flink and Pinot.  It is entirely possible that 
this could fall away if there was enough segment / input file lineage to make 
the sync a reality - which could even be done via a spark job which optimises 
the delta lake and applies mutation.  For our use case having the building 
blocks in place allows us to replay the INSERT operations from the delta lake 
from a given checkpoint / version into Pinot should we need to rebuild a table 
from scratch.


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