vipere opened a new pull request, #744:
URL: https://github.com/apache/arrow-adbc/pull/744

   `fetchall` currently fails on queries that return no results.
   
   The issue is `_reader.read_next_batch()` returns a batch with no rows which 
is not expected by the python code.
   I've added a condition similar to the one in the [go 
driver](https://github.com/apache/arrow-adbc/blob/main/go/adbc/sqldriver/driver.go#L590).


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