HyukjinKwon commented on a change in pull request #28896:
URL: https://github.com/apache/spark/pull/28896#discussion_r443900894



##########
File path: 
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/csv/CSVInferSchema.scala
##########
@@ -103,7 +103,16 @@ class CSVInferSchema(val options: CSVOptions) extends 
Serializable {
       typeSoFar
     } else {
       typeSoFar match {
-        case NullType => tryParseInteger(field)
+        case NullType =>
+          tryParseInteger(field) match {

Review comment:
       But the problem is that that's going to degrade the performance, and 
single partition case is arguably rare. Let's make sure we don't have the 
performance penalty in general cases.




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