Jefffrey commented on PR #10094:
URL: https://github.com/apache/arrow-rs/pull/10094#issuecomment-4675672374

   i suppose the closest we could get is slicing away any unused parts of the 
run_ends/values, for example:
   
   ```
   // represents: [a,a,b,b,b,a,a,a,c,c]
   Runarray = {run_ends: [2,5,8,10], values:["a","b","a","c"], offset = 0, 
length = 10}
   let sliced = Runarray.slice(3,5)
   // represents: [b,b,a,a,a]
   // now physically
   sliced = {run_ends: [5,8], values:["b","a"], offset = 3, length = 5}
   ```
   
   - the sliced run_ends and values are just slices of the originals, to keep 
this as zero-copy
   
   though i don't know if there are any edge cases this might miss 🤔 


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