tustvold opened a new issue, #4129:
URL: https://github.com/apache/arrow-rs/issues/4129

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   Following #3746 the CSV schema inference infers datetime strings as 
Timestamps, not Date64, as this was incorrect #3744.
   
   However, the CSV reader still uses datetime_regex for Date64 columns, which 
is incorrect.
   
   Following #3794 the timestamp parsing logic has got a whole lot more 
sophisticated, and it is unclear how to support arbitrary format strings with 
it.
   
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   Given this functionality has been broken since #3746 and nobody has noticed, 
and no tests failed, I think we should just remove it
   
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