Addresses comments

Author: liancheng

sql/core/src/main/scala/org/apache/spark/sql/sources/DataSourceStrategy.scala

@@ -90,7 +90,7 @@ private[sql] object DataSourceStrategy extends Strategy with Logging {
     case PhysicalOperation(projectList, filters, l @ LogicalRelation(t: FSBasedRelation)) =>
       val inputPaths = t.paths.map(new Path(_)).flatMap { path =>
         val fs = path.getFileSystem(t.sqlContext.sparkContext.hadoopConfiguration)
-        val qualifiedPath = fs.makeQualified(path)
+        val qualifiedPath = path.makeQualified(fs.getUri, fs.getWorkingDirectory)
         SparkHadoopUtil.get.listLeafStatuses(fs, qualifiedPath).map(_.getPath).filterNot { path =>
           val name = path.getName
           name.startsWith("_") || name.startsWith(".")

sql/core/src/main/scala/org/apache/spark/sql/sources/commands.scala

@@ -71,7 +71,7 @@ private[sql] case class InsertIntoFSBasedRelation(
     val hadoopConf = sqlContext.sparkContext.hadoopConfiguration
     val outputPath = new Path(relation.paths.head)
     val fs = outputPath.getFileSystem(hadoopConf)
-    val qualifiedOutputPath = fs.makeQualified(outputPath)
+    val qualifiedOutputPath = outputPath.makeQualified(fs.getUri, fs.getWorkingDirectory)
 
     val doInsertion = (mode, fs.exists(qualifiedOutputPath)) match {
       case (SaveMode.ErrorIfExists, true) =>

sql/core/src/main/scala/org/apache/spark/sql/sources/interfaces.scala

@@ -301,7 +301,7 @@ abstract class OutputWriter {
  *
  * @constructor This constructor is for internal uses only. The [[PartitionSpec]] argument is for
  *              implementing metastore table conversion.
- * @param paths Base paths of this relation.  For partitioned relations, it should be either root
+ * @param paths Base paths of this relation.  For partitioned relations, it should be the root
  *        directories of all partition directories.
  * @param maybePartitionSpec An [[FSBasedRelation]] can be created with an optional
  *        [[PartitionSpec]], so that partition discovery can be skipped.
@@ -371,8 +371,8 @@ abstract class FSBasedRelation private[sql](
   }
 
   /**
-   * Schema of this relation.  It consists of [[dataSchema]] and all partition columns not appeared
-   * in [[dataSchema]].
+   * Schema of this relation.  It consists of columns appearing in [[dataSchema]] and all partition
+   * columns not appearing in [[dataSchema]].
    */
   override lazy val schema: StructType = {
     val dataSchemaColumnNames = dataSchema.map(_.name.toLowerCase).toSet