[GitHub] [spark] HeartSaVioR commented on a change in pull request #26195: [SPARK-29537][SQL] throw exception when user defined a wrong base path

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HeartSaVioR commented on a change in pull request #26195: [SPARK-29537][SQL] throw exception when user defined a wrong base path
URL: https://github.com/apache/spark/pull/26195#discussion_r352462320
 
 

 ##########
 File path: sql/core/src/main/scala/org/apache/spark/sql/execution/datasources/PartitioningAwareFileIndex.scala
 ##########
 @@ -221,6 +221,15 @@ abstract class PartitioningAwareFileIndex(
         if (!fs.isDirectory(userDefinedBasePath)) {
           throw new IllegalArgumentException(s"Option '$BASE_PATH_PARAM' must be a directory")
         }
+        def qualifiedPath(path: Path): Path = path.makeQualified(fs.getUri, fs.getWorkingDirectory)
+
+        val qualifiedBasePath = qualifiedPath(userDefinedBasePath)
+        rootPaths
+          .find(p => !qualifiedPath(p).toString.startsWith(qualifiedBasePath.toString))
+          .foreach { rp =>
+            throw new IllegalArgumentException(
+              s"Wrong basePath $userDefinedBasePath for the root path: $rp")
+          }
         Set(fs.makeQualified(userDefinedBasePath))
 
 Review comment:
   Can be simply `Set(qualifiedBasePath)` as we now calculated it before; if we want to change `qualifiedPath()` to return String, `Set(new Path(qualifiedBasePath))`.

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