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https://issues.apache.org/jira/browse/SPARK-15585?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15318113#comment-15318113
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Takeshi Yamamuro commented on SPARK-15585:
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yea, it's okay to me just to add docs about different behaviours between
`sqlContext.read.csv` and ``com.databricks.spark.csv` like;
https://github.com/apache/spark/compare/master...maropu:SPARK-15585-2
> 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. We can then in
> CSVOptions.getChar (and JSONOptions, etc) to actually return null if the
> value is null, rather than setting it to default value.
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