Jefffrey commented on issue #10577:
URL: https://github.com/apache/arrow-rs/issues/10577#issuecomment-5215707290

   sounds reasonable, if youre just after the count
   
   > Related but separate: `with_truncated_rows` is asymmetric — it recovers 
rows
   with too few fields, but a row with too many is always an error, with no
   equivalent opt-in to drop the surplus. Handling both directions currently 
means
   pre-scanning for the widest record and padding the schema out to it, then
   projecting the extra columns away. Happy to open that separately if it is 
worth
   its own issue.
   
   this could be worth raising as a separate issue


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