[jira] [Created] (SPARK-25660) Impossible to use backward slash as the CSV fields delimiter

["Maxim Gekk (JIRA)" <ji...@apache.org>]

Maxim Gekk created SPARK-25660:
----------------------------------

             Summary: Impossible to use backward slash as the CSV fields delimiter 
                 Key: SPARK-25660
                 URL: https://issues.apache.org/jira/browse/SPARK-25660
             Project: Spark
          Issue Type: Improvement
          Components: SQL
    Affects Versions: 2.4.0
            Reporter: Maxim Gekk


If fields in CSV input are delimited by *'\'*, for example:
{code}
123\4\5\1\Q\\P\P\2321213\1\\\P\\F
{code}
reading it by the code:
{code:python}
df = spark.read.format('csv').option("header","false").options(delimiter='\\').load("file:///file.csv")
{code}
causes the exception:
{code}
String index out of range: 1
java.lang.StringIndexOutOfBoundsException: String index out of range: 1
	at java.lang.String.charAt(String.java:658)
	at org.apache.spark.sql.execution.datasources.csv.CSVUtils$.toChar(CSVUtils.scala:101)
	at org.apache.spark.sql.execution.datasources.csv.CSVOptions.<init>(CSVOptions.scala:86)
	at org.apache.spark.sql.execution.datasources.csv.CSVOptions.<init>(CSVOptions.scala:41)
	at org.apache.spark.sql.DataFrameReader.csv(DataFrameReader.scala:488)
{code}



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