Github user HyukjinKwon commented on a diff in the pull request:

    https://github.com/apache/spark/pull/21571#discussion_r196626934
  
    --- Diff: python/pyspark/sql/tests.py ---
    @@ -2126,6 +2126,42 @@ class WriterWithNonCallableClose(WithProcess):
             tester.assert_invalid_writer(WriterWithNonCallableClose(),
                                          "'close' in provided object is not 
callable")
     
    +    def test_streaming_foreachBatch(self):
    +        q = None
    +        collected = dict()
    +
    +        def collectBatch(batch_df, batch_id):
    --- End diff --
    
    collectBatch -> collect_batch per PEP 8.


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