thisisnic commented on issue #33149:
URL: https://github.com/apache/arrow/issues/33149#issuecomment-1641702568

   I'm not entirely sure this will work - as you acknowledge, there will be 
queries where `nrow` is unknowable until we call `compute()`, and I don't think 
we want to be doing that.  And while we might know the length of an Arrow 
Table, it gets trickier with a Dataset.  
   
   My gut instinct is to err on the side of **not** supporting this as it'll 
require a high level of complexity to support and only support partially if 
it's possible, and I've not encountered any other user requests to support it.  
However, I'm definitely open to hearing otherwise!  @paleolimbot - I'd be keen 
to have your input here.


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