virajjasani opened a new pull request, #2221:
URL: https://github.com/apache/phoenix/pull/2221

   Jira: PHOENIX-7664
   
   CDC Scanners like other Global index scanners attempt to remove 
EmptyColumnOnlyFilter and FirstKeyOnlyFilter from the scan, however it is not 
enough when EmptyColumnOnlyFilter or FirstKeyOnlyFilter is used with other 
filters e.g. PageFilter with LIMIT.
   
   For CDC queries, the user initiated upsert and delete statements do not face 
any issues as the scan on the uncovered index is only expected to retrieve 
empty column cell. However, it does not work when we need to retrieve more 
cells than just empty column e.g. "_CDC_IMG_" column cell should be returned by 
the delegate scanner for TTL expired CDC events.
   
   The purpose of this PR is to remove the filters even when they are used in 
combination with others.


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