yihua commented on issue #18819:
URL: https://github.com/apache/hudi/issues/18819#issuecomment-4793939454

   > Should the same rejection also apply to partition-path fields (and 
preCombine/ordering fields), or strictly the record key for now?
   
   Yes.  BLOB column should not be partition-path, record key, or ordering 
field.  This guard should stay at the core write client layer, not just for 
Spark SQL.
   
   > Is rejecting all BLOB record keys the desired behavior, or should 
EXTERNAL/reference BLOBs be treated differently from INLINE?
   
   Agree with @rahil-c .  Inline and out-of-line BLOB type is per record, not 
per table.  We should fail fast regardless of BLOB types.


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