loserwang1024 commented on issue #3423:
URL: https://github.com/apache/fluss/issues/3423#issuecomment-4610458318

   > 2. Server-side alignment: In `createProjectionInfo()`, we split 
`selectedFieldPositions` into existing fields and missing fields. Then in 
`projectSingleBatch()`, we reconstruct the Arrow batch by copying existing 
vectors and generating all-NULL Arrow vectors for the missing columns at their 
correct target positions.
   
   @wuchong , I have been talked this with you , WDYT?  (You have adviced that 
server only return  existing fields (and with filed id), then append  null in 
client side.)
   


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