address comments

WeichenXu123 · WeichenXu123 · commit 944294893f5a · 2019-07-30T20:48:28.000+08:00
diff --git a/sql/core/src/main/scala/org/apache/spark/sql/execution/datasources/v2/FileScan.scala b/sql/core/src/main/scala/org/apache/spark/sql/execution/datasources/v2/FileScan.scala
@@ -51,7 +51,8 @@ abstract class FileScan(
    * otherwise return `None`.
    */
   def getFileUnSplittableReason(path: Path): Option[String] = {
-    if (!isSplitable(path)) Some("Undefined") else None
+    assert(!isSplitable(path))
+    Some("undefined")
   }
 
   override def description(): String = {

Original file line number	Diff line number	Diff line change
`@@ -51,7 +51,8 @@ abstract class FileScan(`
`51`	`51`	* otherwise return `None`.
`52`	`52`	`*/`
`53`	`53`	`def getFileUnSplittableReason(path: Path): Option[String] = {`
`54`		`- if (!isSplitable(path)) Some("Undefined") else None`
	`54`	`+ assert(!isSplitable(path))`
	`55`	`+ Some("undefined")`
`55`	`56`	`}`
`56`	`57`
`57`	`58`	`override def description(): String = {`