Github user HyukjinKwon commented on a diff in the pull request:
https://github.com/apache/spark/pull/13041#discussion_r62792044
--- Diff:
sql/core/src/main/scala/org/apache/spark/sql/execution/datasources/csv/DefaultSource.scala
---
@@ -61,7 +61,9 @@ class DefaultSource extends FileFormat with
DataSourceRegister {
val firstRow = new LineCsvReader(csvOptions).parseLine(firstLine)
val header = if (csvOptions.headerFlag) {
- firstRow
+ firstRow.zipWithIndex.map { case (value, index) =>
+ if (value == "" || value == null) s"C$index" else value
--- End diff --
I see Spark allows a empty string as a field. So, I wonder if we should
rename this with the index and prefix, `C`. Also, I think `""` will throw an
NPE whereas empty string without quotes will produce a correct field because
the default of `nullValue` is `""`.
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