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https://issues.apache.org/jira/browse/SPARK-38955?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17524676#comment-17524676
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Hyukjin Kwon commented on SPARK-38955:
--------------------------------------
lineSep doesn't work with from_csv. We should probably ban this option within
this expression.
> from_csv can corrupt surrounding lines if a lineSep is in the data
> ------------------------------------------------------------------
>
> Key: SPARK-38955
> URL: https://issues.apache.org/jira/browse/SPARK-38955
> Project: Spark
> Issue Type: Bug
> Components: SQL
> Affects Versions: 3.2.0
> Reporter: Robert Joseph Evans
> Priority: Major
>
> I don't know how critical this is. I was doing some general testing to
> understand {{from_csv}} and found that if I happen to have a {{lineSep}} in
> the input data and I noticed that the next row appears to be corrupted.
> {{multiLine}} does not appear to fix it. Because this is data corruption I am
> inclined to mark this as CRITICAL or BLOCKER, but it is an odd corner case so
> I m not going to set it myself.
> {code}
> Seq[String]("1,\n2,3,4,5","6,7,8,9,10", "11,12,13,14,15",
> null).toDF.select(col("value"), from_csv(col("value"),
> StructType(Seq(StructField("a", LongType), StructField("b", StringType))),
> Map[String,String]())).show()
> +--------------+---------------+
> | value|from_csv(value)|
> +--------------+---------------+
> | 1,\n2,3,4,5| {1, null}|
> | 6,7,8,9,10| {null, 8}|
> |11,12,13,14,15| {11, 12}|
> | null| null|
> +--------------+---------------+
> {code}
> {code}
> Seq[String]("1,:2,3,4,5","6,7,8,9,10", "11,12,13,14,15",
> null).toDF.select(col("value"), from_csv(col("value"),
> StructType(Seq(StructField("a", LongType), StructField("b", StringType))),
> Map[String,String]("lineSep" -> ":"))).show()
> +--------------+---------------+
> | value|from_csv(value)|
> +--------------+---------------+
> | 1,:2,3,4,5| {1, null}|
> | 6,7,8,9,10| {null, 8}|
> |11,12,13,14,15| {11, 12}|
> | null| null|
> +--------------+---------------+
> {code}
> {code}
> Seq[String]("1,\n2,3,4,5","6,7,8,9,10", "11,12,13,14,15",
> null).toDF.select(col("value"), from_csv(col("value"),
> StructType(Seq(StructField("a", LongType), StructField("b", StringType))),
> Map[String,String]("lineSep" -> ":"))).show()
> +--------------+---------------+
> | value|from_csv(value)|
> +--------------+---------------+
> | 1,\n2,3,4,5| {1, \n2}|
> | 6,7,8,9,10| {6, 7}|
> |11,12,13,14,15| {11, 12}|
> | null| null|
> +--------------+---------------+
> {code}
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