subhramit commented on code in PR #58226:
URL: https://github.com/apache/spark/pull/58226#discussion_r3967018191


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sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/csv/CSVOptions.scala:
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@@ -124,7 +124,7 @@ class CSVOptions(
 
   val extension = {
     val ext = parameters.getOrElse(EXTENSION, "csv")
-    if (ext.size != 3 && !ext.forall(_.isLetter)) {
+    if (ext.size != 3 || !ext.forall(_.isLetter)) {

Review Comment:
   Are you proposing we should keep allowing `.abcd`, `.ab1`, `.a`, `.a/b` as 
valid csv extensions?



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