tchivs commented on PR #4202:
URL: https://github.com/apache/flink-cdc/pull/4202#issuecomment-3696734360

   > I think it's OK to polish documentations in this PR, leaving metadata 
definitions as it is.
   
   Thanks @yuxiqian for the feedback! I've polished the documentation to 
clarify the relationship between metadata columns and Transform expressions.
   
   **Changes made:**
   - Added a note section explaining that `database_name`, `schema_name`, and 
`table_name` are also available via Transform expressions 
(`__namespace_name__`, `__schema_name__`, `__table_name__`)
   - Clarified that `op_ts` is only available via `metadata.list`
   - Explained the trade-offs: using `metadata.list` allows passing values 
directly to downstream sinks without transform rules (simpler for basic use 
cases)
   - Updated the table descriptions to mention the Transform expression 
alternatives
   
   The metadata definitions remain unchanged as you suggested. 


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