jonvex opened a new pull request, #12144:
URL: https://github.com/apache/hudi/pull/12144

   ### Change Logs
   
   reader context had default implementation of get engine delete 
representation as null. The unmerged reader does not have handling for that. 
When compared with the other unmerged reader implementations they never process 
delete blocks, so the unmerged buffer is now updated to skip delete blocks
   
   ### Impact
   
   Spark npe is avoided and should be a slight perf boost. Also 1 less reader 
context method which is good.
   
   ### Risk level (write none, low medium or high below)
   
   none
   
   ### Documentation Update
   
   N/A
   
   ### Contributor's checklist
   
   - [ ] Read through [contributor's 
guide](https://hudi.apache.org/contribute/how-to-contribute)
   - [ ] Change Logs and Impact were stated clearly
   - [ ] Adequate tests were added if applicable
   - [ ] CI passed
   


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