Jackie-Jiang commented on issue #8945:
URL: https://github.com/apache/pinot/issues/8945#issuecomment-1162145614

   Thanks for raising this! Agree that several checks are too restrictive, and 
make changes very hard or even impossible.
   The following changes should be safe:
   - Change default value (only applied during ingestion)
   - Change granularity of DateTimeField (granularity is just for description 
purpose currently)
   - Change maxLength of a column (only applied during ingestion)
   
   Some changes might cause problem, and we can discuss further:
   - Change field type (I feel switching between dimension and metric should be 
okay, but need some testing)
   - Change data type (can cause schema mismatch)
   - Remove column (just removing column might be okay, but if the same column 
is added back with different data type, it can cause problem)


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