mslapek commented on issue #5157:
URL: 
https://github.com/apache/arrow-datafusion/issues/5157#issuecomment-1476661030

   > Another possibility would be to use `Arc<str>` (aka refcounted strings) -- 
not quite as cheap to clone / create but also don't need any external context
   
   Looks like a good tradeoff.
   
   What do you think about 🎯 **precomputed hash** +  `Arc<str>`?
   
   * constant time cloning
   * constant time hashing (#5623 proposes to use `LogicalPlan` hashing in the 
optimizer loop)
   
   Performance almost-like string interning.


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