nealrichardson opened a new pull request #12533:
URL: https://github.com/apache/arrow/pull/12533


   This allows us to use the query engine without `ARROW_DATASET=ON`, and it's 
nice to just keep around the object that was provided instead of transforming 
it, which makes printing query objects a little more intuitive. There may be 
other optimizations or cleanups we could do as well.
   
   Other changes: added head/tail methods for RecordBatchReader and fixed an 
edge case (`head(x, 0)` works but was previously rejected as invalid input).


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