Dandandan opened a new pull request #8781:
URL: https://github.com/apache/arrow/pull/8781


   Still WIP, but makes CSV reading (quite a bit) faster by reusing a bit more 
allocations, doing things a bit more manually.
   
   The nytaxi benchmark speeds up from ~4500ms to ~3500ms.
   
   I think a further optimization would be to stop using the `StringRecords` 
altogether (e.g. by using the underlying 
https://docs.rs/csv-core/0.1.10/csv_core/ library instead) but this could be a 
next step.
   
   FYI @alamb @nevi-me @jorgecarleitao 


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