Reynold Xin created SPARK-15585:
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             Summary: Don't use null in data source options to indicate default 
value
                 Key: SPARK-15585
                 URL: https://issues.apache.org/jira/browse/SPARK-15585
             Project: Spark
          Issue Type: Improvement
          Components: SQL
            Reporter: Reynold Xin
            Priority: Critical


See email: 
http://apache-spark-developers-list.1001551.n3.nabble.com/changed-behavior-for-csv-datasource-and-quoting-in-spark-2-0-0-SNAPSHOT-td17704.html

We'd need to change DataFrameReader/DataFrameWriter in Python's 
csv/json/parquet/... functions to put the actual default option values as 
function parameters, rather than setting them to None.




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