2010YOUY01 commented on PR #6462:
URL: 
https://github.com/apache/arrow-datafusion/pull/6462#issuecomment-1564779391

   I forget to mention in the original PR 
https://github.com/apache/arrow-datafusion/pull/6448 : the rationale behind 
storing the mapping (`ALL_FUNCTIONS`) separately is for future implementation 
of 'Did you mean': `select powr() -> Error: Did you mean power()?`, otherwise 
copy and paste the mapping in `FromStr` into `Display` would be okay.
   
   Also I thought iterating through a small vector several times is not likely 
to be the performance issue for an analytical system, so the original 
implementation is trying to make the code more maintainable and avoid 
over-engineering.
   But this speedup implementation is very effective and clean, thank you!


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