Jefffrey commented on issue #4555:
URL: https://github.com/apache/arrow-rs/issues/4555#issuecomment-5119523762

   some pointers
   
   need to modify `can_cast_types()` to allow this cast of stirng -> duration:
   
   
https://github.com/apache/arrow-rs/blob/005a2fd43f1b243ed43f4cfa356ebe8f0757939b/arrow-cast/src/cast/mod.rs#L112-L125
   
   then implement the cast arms in the main cast function:
   
   
https://github.com/apache/arrow-rs/blob/005a2fd43f1b243ed43f4cfa356ebe8f0757939b/arrow-cast/src/cast/mod.rs#L760-L782
   
   see how we have functions for casting string to interval as reference:
   
   
https://github.com/apache/arrow-rs/blob/005a2fd43f1b243ed43f4cfa356ebe8f0757939b/arrow-cast/src/cast/string.rs#L207-L237
   
   and add tests down here:
   
   
https://github.com/apache/arrow-rs/blob/005a2fd43f1b243ed43f4cfa356ebe8f0757939b/arrow-cast/src/cast/mod.rs#L2851-L2858


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