Github user gatorsmile commented on a diff in the pull request:
https://github.com/apache/spark/pull/20894#discussion_r190143638
--- Diff:
sql/core/src/main/scala/org/apache/spark/sql/execution/datasources/csv/CSVDataSource.scala
---
@@ -118,6 +121,64 @@ object CSVDataSource {
TextInputCSVDataSource
}
}
+
+ /**
+ * Checks that column names in a CSV header and field names in the
schema are the same
+ * by taking into account case sensitivity.
+ */
+ def checkHeaderColumnNames(
+ schema: StructType,
+ columnNames: Array[String],
+ fileName: String,
+ enforceSchema: Boolean,
+ caseSensitive: Boolean): Unit = {
+ if (!enforceSchema && columnNames != null) {
--- End diff --
When `enforceSchema` is false and `columnName` is not null, we still should
check the schema. We should issue a warning log message in this case when the
schema do not match
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