cloud-fan commented on issue #27509: [SPARK-30764][SQL] Improve the readability 
of EXPLAIN FORMATTED style
URL: https://github.com/apache/spark/pull/27509#issuecomment-588992515
 
 
   ```
   File 
"/home/jenkins/workspace/SparkPullRequestBuilder/python/pyspark/sql/dataframe.py",
 line 282, in pyspark.sql.dataframe.DataFrame.explain
   Failed example:
       df.explain(mode="formatted")
   Differences (ndiff with -expected +actual):
         == Physical Plan ==
         * Scan ExistingRDD (1)
       + <BLANKLINE>
       + <BLANKLINE>
         (1) Scan ExistingRDD [codegen id : 1]
       - Output: [age#0, name#1]
       + Output [2]: [age#0, name#1]
       ?       ++++
       + Arguments: [age#0, name#1], MapPartitionsRDD[4] at 
applySchemaToPythonRDD at NativeMethodAccessorImpl.java:0, ExistingRDD, 
UnknownPartitioning(0)
       + <BLANKLINE>
       + <BLANKLINE>
   **********************************************************************
      1 of   3 in pyspark.sql.dataframe.DataFrame.explain
   ***Test Failed*** 1 failures.
   ```
   @Eric5553 can you fix the pyspark test? you should update `dataframe.py` 
`explain` method
   ```
   >>> df.explain(mode="formatted")
           == Physical Plan ==
           * Scan ExistingRDD (1)
           (1) Scan ExistingRDD [codegen id : 1]
           Output: [age#0, name#1]
   
           .. versionchanged:: 3.0.0
              Added optional argument `mode` to specify the expected output 
format of plans.
           """
   ```

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