cloud-fan commented on code in PR #47633:
URL: https://github.com/apache/spark/pull/47633#discussion_r1706649389
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sql/core/src/test/scala/org/apache/spark/sql/execution/datasources/csv/CSVSuite.scala:
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@@ -1420,6 +1420,22 @@ abstract class CSVSuite
}
}
+ test("SPARK-49125: write CSV files with duplicated field names") {
+ withTempPath { path =>
+ sql("SELECT 's1' a, 's2' a").write.csv(path.getCanonicalPath)
+ val df = spark.read.csv(path.getCanonicalPath)
+ assert(df.columns === Array("_c0", "_c1"))
Review Comment:
The relevant code is
https://github.com/apache/spark/blob/master/sql/core/src/main/scala/org/apache/spark/sql/execution/datasources/csv/CSVUtils.scala#L71-L95
duplicated column names in the header will always be replaced by `_c0`,
`_c1`, etc.
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