maartenbreddels commented on a change in pull request #8628:
URL: https://github.com/apache/arrow/pull/8628#discussion_r520776198



##########
File path: python/pyarrow/tests/test_compute.py
##########
@@ -860,6 +860,17 @@ def test_fill_null():
     expected = pa.array([None, None, None, None])
     assert result.equals(expected)
 
+    arr = pa.array(['a', 'bb', None])
+    result = arr.fill_null('ccc')
+    expected = pa.array(['a', 'bb', 'ccc'])
+    assert result.equals(expected)
+
+    arr = pa.array([b'a', b'bb', None], type=pa.large_binary())
+    result = arr.fill_null('ccc')
+    expected = pa.array([b'a', b'bb', b'ccc'])

Review comment:
       Thanks, I stared at that piece of code for quite a bit!




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