itholic commented on code in PR #43444:
URL: https://github.com/apache/spark/pull/43444#discussion_r1373988727


##########
python/pyspark/testing/utils.py:
##########
@@ -592,20 +617,22 @@ def assert_rows_equal(rows1: List[Row], rows2: List[Row]):
             rows_str2 += str(r2) + "\n"
             if not compare_rows(r1, r2):
                 diff_rows_cnt += 1
-                diff_rows = True
+                has_diff_rows = True
+                if includeDiffRows:
+                    diff_rows.append((r1, r2))
 
         generated_diff = _context_diff(
             actual=rows_str1.splitlines(), expected=rows_str2.splitlines(), 
n=len(zipped)
         )
 
-        if diff_rows:
+        if has_diff_rows:
             error_msg = "Results do not match: "
             percent_diff = (diff_rows_cnt / len(zipped)) * 100
             error_msg += "( %.5f %% )" % percent_diff
             error_msg += "\n" + "\n".join(generated_diff)
+            data = diff_rows if includeDiffRows else None
             raise PySparkAssertionError(
-                error_class="DIFFERENT_ROWS",
-                message_parameters={"error_msg": error_msg},
+                error_class="DIFFERENT_ROWS", message_parameters={"error_msg": 
error_msg}, data=data

Review Comment:
   Sure! Will add it



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