[jira] [Created] (ARROW-8198) [C++] Diffing should handle null arrays

["Antoine Pitrou (Jira)" <ji...@apache.org>]

Antoine Pitrou created ARROW-8198:
-------------------------------------

             Summary: [C++] Diffing should handle null arrays
                 Key: ARROW-8198
                 URL: https://issues.apache.org/jira/browse/ARROW-8198
             Project: Apache Arrow
          Issue Type: Improvement
          Components: C++
            Reporter: Antoine Pitrou


When {{AssertArraysEqual}} fails between arrays of type null, you get the rather unhelpful message:
{code}
../src/arrow/compare.cc:964:  Check failed: _s.ok() Operation failed: PrintDiff(left, right, opts.diff_sink())
Bad status: NotImplemented: formatting diffs between arrays of type null
In ../src/arrow/array/diff.cc, line 453, code: VisitTypeInline(type, this)
In ../src/arrow/array/diff.cc, line 825, code: (_error_or_value10).status()
In ../src/arrow/compare.cc, line 955, code: (_error_or_value4).status()
{code}



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