fallintoplace opened a new pull request, #1148:
URL: https://github.com/apache/arrow-go/pull/1148

   ## What
   
   The custom CSV writer converter is documented to return one string per array 
value, but the writer trusted the result. Short results silently produced empty 
cells and long results could panic while filling the record matrix. This 
returns arrow.ErrInvalid for either mismatch.
   
   ## Test
   
   - go test ./arrow/csv -run TestCustomTypeConverterValidatesRowCount -count=1


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