nrnavaneet opened a new pull request, #53138:
URL: https://github.com/apache/airflow/pull/53138

   ### What
   Fixes a KeyError that occurs when BigQuery job results return an empty 
schema or no 'fields' key.
   
   ### Why
   Some queries like external table creation return an empty schema ({}), 
causing `schema["fields"]` to raise a KeyError.
   
   ### How
   - Updated `_format_schema_for_description` to safely handle None or missing 
'fields' key.
   - Added unit tests to cover:
     - Normal schema
     - Empty schema
     - Schema with missing 'fields'
   
   Closes: #53127


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