wangyum commented on a change in pull request #29088:
URL: https://github.com/apache/spark/pull/29088#discussion_r454249166



##########
File path: 
sql/core/src/main/scala/org/apache/spark/sql/execution/datasources/csv/CsvOutputWriter.scala
##########
@@ -39,6 +39,10 @@ class CsvOutputWriter(
 
   private val gen = new UnivocityGenerator(dataSchema, writer, params)
 
+  if (params.bom) {
+    writer.write(0xFEFF)

Review comment:
       No. `0xEFBBBF` will change the value:
   
![image](https://user-images.githubusercontent.com/5399861/87413662-2b2d2c80-c5fd-11ea-81b9-d363247f02e6.png)
   




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