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From "Brian Jones (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (SPARK-25739) Double quote coming in as empty value even when emptyValue set as null
Date Mon, 15 Oct 2018 21:31:00 GMT

     [ https://issues.apache.org/jira/browse/SPARK-25739?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Brian Jones updated SPARK-25739:
--------------------------------
    Environment:  Databricks - 4.2 (includes Apache Spark 2.3.1, Scala 2.11)   (was:  

Databricks - 4.2 (includes Apache Spark 2.3.1, Scala 2.11) )

> 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: 2.3.2
>         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 2.3.2, 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.



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