getChan commented on PR #4647:
URL: 
https://github.com/apache/datafusion-comet/pull/4647#issuecomment-5460717998

   Yes. MapType is covered by the existing complex-type legacy guard, so it 
routes through CodegenDispatchFallback instead of the native map-to-string cast 
when the config is enabled. I also added an empty-map case to 
cast_complex_types_to_string_legacy.sql.


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