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https://issues.apache.org/jira/browse/SPARK-32614?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Chandan updated SPARK-32614:
----------------------------
Component/s: Spark Core
> Support for treating the line as valid record if it starts with \u0000 or
> null character, or starts with any character mentioned as comment
> -------------------------------------------------------------------------------------------------------------------------------------------
>
> Key: SPARK-32614
> URL: https://issues.apache.org/jira/browse/SPARK-32614
> Project: Spark
> Issue Type: Improvement
> Components: Spark Core, SQL
> Affects Versions: 3.0.0
> Reporter: Chandan
> Assignee: Jeff Evans
> Priority: Major
>
> Currently, the delimiter option Spark 2.0 to read and split CSV files/data
> only support a single character delimiter. If we try to provide multiple
> delimiters, we observer the following error message.
> eg: Dataset<Row> df = spark.read().option("inferSchema", "true")
> .option("header",
> "false")
> .option("delimiter",
> ", ")
> .csv("C:\test.txt");
> Exception in thread "main" java.lang.IllegalArgumentException: Delimiter
> cannot be more than one character: ,
> at
> org.apache.spark.sql.execution.datasources.csv.CSVUtils$.toChar(CSVUtils.scala:111)
> at
> org.apache.spark.sql.execution.datasources.csv.CSVOptions.<init>(CSVOptions.scala:83)
> at
> org.apache.spark.sql.execution.datasources.csv.CSVOptions.<init>(CSVOptions.scala:39)
> at
> org.apache.spark.sql.execution.datasources.csv.CSVFileFormat.inferSchema(CSVFileFormat.scala:55)
> at
> org.apache.spark.sql.execution.datasources.DataSource$$anonfun$8.apply(DataSource.scala:202)
> at
> org.apache.spark.sql.execution.datasources.DataSource$$anonfun$8.apply(DataSource.scala:202)
> at scala.Option.orElse(Option.scala:289)
> at
> org.apache.spark.sql.execution.datasources.DataSource.getOrInferFileFormatSchema(DataSource.scala:201)
> at
> org.apache.spark.sql.execution.datasources.DataSource.resolveRelation(DataSource.scala:392)
> at
> org.apache.spark.sql.DataFrameReader.loadV1Source(DataFrameReader.scala:239)
> at org.apache.spark.sql.DataFrameReader.load(DataFrameReader.scala:227)
> at org.apache.spark.sql.DataFrameReader.csv(DataFrameReader.scala:596)
> at org.apache.spark.sql.DataFrameReader.csv(DataFrameReader.scala:473)
>
> Generally, the data to be processed contains multiple character delimiters
> and presently we need to do a manual data clean up on the source/input file,
> which doesn't work well in large applications which consumes numerous files.
> There seems to be work-around like reading data as text and using the split
> option, but this in my opinion defeats the purpose, advantage and efficiency
> of a direct read from CSV file.
>
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