wuchong commented on PR #2431:
URL: https://github.com/apache/fluss/pull/2431#issuecomment-3804203249

   I think it’s a good idea to use a dedicated prefix for user-extensible 
properties to avoid potential key conflicts in the future.
   
   Instead of `customer.*`, consider clearer and more conventional prefixes 
like `tags.*`, `ext.*`, or `properties.*`, or even begins with `_` prefix such 
as `_owner=xxx`. These better convey that the keys represent custom, 
user-defined metadata. The term `customer` is ambiguous and doesn’t clearly 
signal extensibility. Moreover, from Fluss’s perspective, any property outside 
the `table.*` namespace is effectively a custom property.
   
   Examples:
   ```
   tags.owner = 'xxx'
   ext.owner = 'xxx'
   properties.owner = 'xxx'
   _owner = 'xxx'
   ```
   


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