Github user andrewor14 commented on a diff in the pull request:
https://github.com/apache/spark/pull/13041#discussion_r62920728
--- 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$index" else value
+ }
} else {
firstRow.zipWithIndex.map { case (value, index) => s"C$index" }
--- End diff --
I talked to @marmbrus offline.
[Elsewhere](https://github.com/apache/spark/blob/master/sql/core/src/main/scala/org/apache/spark/sql/catalyst/SQLBuilder.scala#L523)
we use `_c0` instead of `C0`, so we should make that consistent. You're gonna
have to change the name both here and in L65.
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