[GitHub] [carbondata] jackylk commented on a change in pull request #3431: [CARBONDATA-3566] Support add segment for partition table

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jackylk commented on a change in pull request #3431: [CARBONDATA-3566] Support add segment for partition table
URL: https://github.com/apache/carbondata/pull/3431#discussion_r345164229
 
 

 ##########
 File path: integration/spark2/src/main/scala/org/apache/spark/sql/execution/strategy/MixedFormatHandler.scala
 ##########
 @@ -56,23 +59,75 @@ object MixedFormatHandler {
     supportedFormats.exists(_.equalsIgnoreCase(format))
   }
 
-  def getSchema(sparkSession: SparkSession,
+  /**
+   * collect schema, list of last level directory and list of all data files under given path
+   *
+   * @param sparkSession spark session
+   * @param options option for ADD SEGMENT
+   * @param inputPath under which path to collect
+   * @return schema of the data file, map of last level directory (partition folder) to its
+   *         children file list (data files)
+   */
+  def collectInfo(
+      sparkSession: SparkSession,
       options: Map[String, String],
-      segPath: String): StructType = {
-    val format = options.getOrElse("format", "carbondata")
-    if ((format.equals("carbondata") || format.equals("carbon"))) {
-      new SparkCarbonFileFormat().inferSchema(sparkSession, options, Seq.empty).get
+      inputPath: String): (StructType, mutable.Map[String, Seq[FileStatus]]) = {
+    val path = new Path(inputPath)
+    val fs = path.getFileSystem(SparkSQLUtil.sessionState(sparkSession).newHadoopConf())
+    val rootPath = fs.getFileStatus(path)
+    val leafDirFileMap = collectAllLeafFileStatus(sparkSession, rootPath, fs)
+    val format = options.getOrElse("format", "carbondata").toLowerCase
+    val fileFormat = if ((format.equals("carbondata") || format.equals("carbon"))) {
+      new SparkCarbonFileFormat()
     } else {
-      val filePath = FileFactory.addSchemeIfNotExists(segPath.replace("\\", "/"))
-      val path = new Path(filePath)
-      val fs = path.getFileSystem(SparkSQLUtil.sessionState(sparkSession).newHadoopConf())
-      val status = fs.listStatus(path, new PathFilter {
-        override def accept(path: Path): Boolean = {
-          !path.getName.equals("_SUCCESS") && !path.getName.endsWith(".crc")
-        }
-      })
-      getFileFormat(new FileFormatName(format)).inferSchema(sparkSession, options, status).get
+      getFileFormat(new FileFormatName(format))
+    }
+    if (leafDirFileMap.isEmpty) {
+      throw new RuntimeException("no partition data is found")
+    }
+    val schema = fileFormat.inferSchema(sparkSession, options, leafDirFileMap.head._2).get
+    (schema, leafDirFileMap)
+  }
+
+  /**
+   * collect leaf directories and leaf files recursively in given path
+   *
+   * @param sparkSession spark session
+   * @param path path to collect
+   * @param fs hadoop file system
+   * @return mapping of leaf directory to its children files
+   */
+  private def collectAllLeafFileStatus(
+      sparkSession: SparkSession,
+      path: FileStatus,
+      fs: FileSystem): mutable.Map[String, Seq[FileStatus]] = {
+    val directories: ArrayBuffer[FileStatus] = ArrayBuffer()
+    val leafFiles: ArrayBuffer[FileStatus] = ArrayBuffer()
+    val lastLevelFileMap = mutable.Map[String, Seq[FileStatus]]()
+
+    // get all files under input path
+    val fileStatus = fs.listStatus(path.getPath, new PathFilter {
+      override def accept(path: Path): Boolean = {
+        !path.getName.equals("_SUCCESS") && !path.getName.endsWith(".crc")
+      }
+    })
+    // collect directories and files
+    fileStatus.foreach { file =>
+      if (file.isDirectory) directories.append(file)
+      else leafFiles.append(file)
+    }
+    if (leafFiles.nonEmpty) {
+      // leaf file is found, so parent folder (input parameter) is the last level dir
+      val updatedPath = FileFactory.getUpdatedFilePath(path.getPath.toString)
+      lastLevelFileMap.put(updatedPath, leafFiles)
+      return lastLevelFileMap
 
 Review comment:
   fixed

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