Zouxxyy opened a new pull request, #8328:
URL: https://github.com/apache/paimon/pull/8328

   ### Purpose
   
   Validate that CSV/JSON/Text format table options (such as 
`csv.quote-character`, `csv.field-delimiter`, etc.) are not empty at table 
creation time.
   
   Previously, setting `csv.quote-character` to an empty string would succeed 
at table creation but fail with `StringIndexOutOfBoundsException` during INSERT 
or SELECT. Now the error is caught early with a clear message.
   
   ### Tests
   
   - Added `FormatTableTestBase#csv with empty quote-character should fail`


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