srowen commented on a change in pull request #29516:
URL: https://github.com/apache/spark/pull/29516#discussion_r476141555



##########
File path: 
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/csv/CSVOptions.scala
##########
@@ -220,7 +220,9 @@ class CSVOptions(
     format.setQuote(quote)
     format.setQuoteEscape(escape)
     charToEscapeQuoteEscaping.foreach(format.setCharToEscapeQuoteEscaping)
-    format.setComment(comment)
+    if (isCommentSet) {

Review comment:
       Right, yeah, so we have to use the new method in univocity 2.9.0 to turn 
off its comment handling if its unset in Spark (= `\u0000`)




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