sanjibansg commented on a change in pull request #12560:
URL: https://github.com/apache/arrow/pull/12560#discussion_r838407430



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File path: cpp/src/arrow/dataset/scanner_test.cc
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@@ -1503,6 +1518,7 @@ TEST(ScanNode, Schema) {
   fields.push_back(field("__fragment_index", int32()));
   fields.push_back(field("__batch_index", int32()));
   fields.push_back(field("__last_in_fragment", boolean()));
+  fields.push_back(field("__filename", utf8()));

Review comment:
       I have added a test which actually checks the values of the augmented 
fields, does the approach looks good, or can we have a better implementation.




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