zhengruifeng opened a new pull request, #38670:
URL: https://github.com/apache/spark/pull/38670

   ### What changes were proposed in this pull request?
   use `assert_eq` in `PandasOnSparkTestCase` to compare dataframes
   
   ### Why are the changes needed?
   show detailed error message
   
   before:
   ```
   Traceback (most recent call last):
     File 
"/home/jenkins/python/pyspark/sql/tests/connect/test_connect_basic.py", line 
244, in test_fill_na
       self.assertTrue(
   AssertionError: False is not true
   ```
   
   after:
   ```
   AssertionError: DataFrame.iloc[:, 0] (column name="id") are different
   
   DataFrame.iloc[:, 0] (column name="id") values are different (100.0 %)
   [index]: [0, 1, 2, 3, 4, 5, 6, 7, 8, 9]
   [left]:  [0, 1, 2, 3, 4, 5, 6, 7, 8, 9]
   [right]: [1, 2, 3, 4, 5, 6, 7, 8, 9, 10]
   
   Left:
      id
   id    int64
   dtype: object
   
   Right:
      id
   id    int64
   dtype: object
   ```
   
   
   ### Does this PR introduce _any_ user-facing change?
   No, test only
   
   
   ### How was this patch tested?
   existing UT


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