alamb opened a new pull request, #7590:
URL: https://github.com/apache/arrow-rs/pull/7590

   # Which issue does this PR close?
   
   - part of https://github.com/apache/arrow-rs/issues/7456
   
   # Rationale for this change
   
   @Dandandan noted on 
https://github.com/apache/arrow-rs/pull/7513/files#r2119136807:
   
   > Looking at the code - this doesn't actually really use the TrustedLen 
optimization.
   I think it could use the same optimization as MutableBuffer::from_trusted_len
   
   # What changes are included in this PR?
   
   Use the trusted len iter  optimization for extendig PrimitiveBuffers
   
   # Are there any user-facing changes?
   
   The only place I can see this used now is `take` with fixed size arrays. 
Thus this may make that somewhat faster (I will run some benchmarks)
   
   I think the real value will be in  the APIs sketched out in 
https://github.com/apache/arrow-rs/pull/7513 to append to StringViewBuilder 
faster
   
   


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