Github user gengliangwang commented on a diff in the pull request:
https://github.com/apache/spark/pull/20894#discussion_r188520182
--- Diff:
sql/core/src/main/scala/org/apache/spark/sql/execution/datasources/csv/CSVDataSource.scala
---
@@ -34,6 +34,7 @@ import org.apache.spark.rdd.{BinaryFileRDD, RDD}
import org.apache.spark.sql.{Dataset, Encoders, SparkSession}
import org.apache.spark.sql.catalyst.InternalRow
import org.apache.spark.sql.execution.datasources._
+import
org.apache.spark.sql.execution.datasources.csv.CSVDataSource.checkHeaderColumnNames
--- End diff --
this is unused
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