niebayes commented on issue #15117:
URL: https://github.com/apache/datafusion/issues/15117#issuecomment-2710052300

   > btw the equivalent rewrite for the old signature should be
   > 
   > signature: Signature::one_of(
   >                 vec![
   >                     TypeSignature::Coercible(vec![Coercion::new_exact(
   >                         TypeSignatureClass::Timestamp,
   >                     )]),
   >                     TypeSignature::Coercible(vec![Coercion::new_exact(
   >                         TypeSignatureClass::Time,
   >                     )])
   >                 ],
   >                 Volatility::Immutable,
   >             ),
   > which doesn't coerce Timestamp to Time or vice versa
   
   Well, this is exactly what I want.


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