jayzhan211 commented on issue #8302:
URL: 
https://github.com/apache/arrow-datafusion/issues/8302#issuecomment-1822857428

   > > That comment is incorrect and doesn't match the implementation. I 
believe it means that it supports conversions that are potentially fallible, 
e.g. Int32 to Int8, but it never silently looses data
   > 
   > Any scenario that we should hint it as potentially fallible but actually 
do nothing for them? It seems to me return false is more straightforward if we 
do nothing.
   
   Maybe Int64(1) cast to Int32(1) is one that is able to safely cast without 
data loss.


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