wuchong commented on pull request #14368:
URL: https://github.com/apache/flink/pull/14368#issuecomment-743063287


   Hi @atris , this task doesn't mean to make `LookupTableSource` extends 
`SupportsProjectionPushDown`. But to make `LookupTableSource` can have the 
ability of  `SupportsProjectionPushDown`. Currently, only `ScanTableSource` 
supports `SupportsProjectionPushDown`. We need to update the planner and 
optimizer to support this. 
   
   I will close this PR for now. 
   
   Besides, @hailong has taken this issue. I'm not sure whether he has been 
starting working on this. Would be better to coordinate the work in the JIRA 
issue. 


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