HyukjinKwon commented on a change in pull request #29088:
URL: https://github.com/apache/spark/pull/29088#discussion_r454812360



##########
File path: 
sql/core/src/test/scala/org/apache/spark/sql/execution/datasources/csv/CSVSuite.scala
##########
@@ -2353,6 +2354,43 @@ abstract class CSVSuite extends QueryTest with 
SharedSparkSession with TestCsvDa
       assert(df.schema.last == StructField("col_mixed_types", StringType, 
true))
     }
   }
+
+  test("Support write BOM to file before writing data if encoded by UTF-8 
charset") {
+    // scalastyle:off nonascii
+    val chinese = "我爱中文"
+    val korean = "나는 한국인을 좋아한다"
+    val japanese = "私は日本人が好き"

Review comment:
       I guess Japanese is the same case @ueshin or @maropu?




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