[GitHub] [spark] viirya commented on a change in pull request #29862: [SPARK-32956][SQL] Ensure that the generated and existing headers are not duplicated in CSV DataSource

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viirya commented on a change in pull request #29862:
URL: https://github.com/apache/spark/pull/29862#discussion_r494649445



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File path: sql/core/src/main/scala/org/apache/spark/sql/execution/datasources/csv/CSVUtils.scala
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@@ -76,7 +76,7 @@ object CSVUtils {
         headerNames.diff(headerNames.distinct).distinct
       }
 
-      row.zipWithIndex.map { case (value, index) =>
+      val header = row.zipWithIndex.map { case (value, index) =>

Review comment:
       I think we can modify the logic here to make sure we generate non-duplicate header in just one run?




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