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https://issues.apache.org/jira/browse/SPARK-25739?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16653604#comment-16653604
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Brian Jones commented on SPARK-25739:
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[~hyukjin.kwon] Alright. But then why is it working on 2.3 then?
> Double quote coming in as empty value even when emptyValue set as null
> ----------------------------------------------------------------------
>
> Key: SPARK-25739
> URL: https://issues.apache.org/jira/browse/SPARK-25739
> Project: Spark
> Issue Type: Bug
> Components: Spark Core
> Affects Versions: 2.3.1
> Environment: Databricks - 4.2 (includes Apache Spark 2.3.1, Scala
> 2.11)
> Reporter: Brian Jones
> Priority: Major
>
> Example code -
> {code:java}
> val df = List((1,""),(2,"hello"),(3,"hi"),(4,null)).toDF("key","value")
> df
> .repartition(1)
> .write
> .mode("overwrite")
> .option("nullValue", null)
> .option("emptyValue", null)
> .option("delimiter",",")
> .option("quoteMode", "NONE")
> .option("escape","\\")
> .format("csv")
> .save("/tmp/nullcsv/")
> var out = dbutils.fs.ls("/tmp/nullcsv/")
> var file = out(out.size - 1)
> val x = dbutils.fs.head("/tmp/nullcsv/" + file.name)
> println(x)
> {code}
> Output -
> {code:java}
> 1,""
> 3,hi
> 2,hello
> 4,
> {code}
> Expected output -
> {code:java}
> 1,
> 3,hi
> 2,hello
> 4,
> {code}
>
> [https://github.com/apache/spark/commit/b7efca7ece484ee85091b1b50bbc84ad779f9bfe]
> This commit is relevant to my issue.
> "Since Spark 2.4, empty strings are saved as quoted empty strings `""`. In
> version 2.3 and earlier, empty strings are equal to `null` values and do not
> reflect to any characters in saved CSV files."
> I am on Spark version 2.3.1, so empty strings should be coming as null. Even
> then, I am passing the correct "emptyValue" option. However, my empty values
> are stilling coming as `""` in the written file.
>
> I have tested the provided code in Databricks runtime environment 5.0 and
> 4.1, and it is giving the expected output. However in Databricks runtime
> 4.2 and 4.3 (which are running spark 2.3.1) we get the incorrect output.
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