viirya commented on code in PR #47633:
URL: https://github.com/apache/spark/pull/47633#discussion_r1706433593
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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:
What happens if we want to read csv header as column names? Will it
automatically rename duplicate columns (seems this is usually how it is
handled, like pandas)?
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