shuwenwei opened a new pull request, #18206:
URL: https://github.com/apache/iotdb/pull/18206

   ## Description
   
   Route external TsFile scan nodes through the device-table scan visitor so 
grouping parallelization recognizes their tag partitioning.
   
   This preserves  for full-tag partitions and enables table function 
processors to be distributed to external scan tasks instead of being placed 
above a merge sort.
   
   ## Test
   
   - Added a unit test verifying that  keeps a  above an  when all tag columns 
are used as partition keys.
   
   ## Test Plan
   
   - Not run (not requested).


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