Github user wzhfy commented on a diff in the pull request: https://github.com/apache/spark/pull/18309#discussion_r122497071 --- Diff: sql/core/src/test/scala/org/apache/spark/sql/test/SQLTestUtils.scala --- @@ -126,6 +126,35 @@ private[sql] trait SQLTestUtils } /** + * Generates the requested number of temporary paths without creating the + * actual files/directories and passes these to the provided function 'f'. + * Deletes any files/directories left at these paths after 'f' returns. + * + * @param numPaths Number of paths to create + * @param f Function to invoke with the created paths + */ + protected def withTempPaths(numPaths: Int)(f: List[File] => Unit) { + def addPaths(numPaths: Int, paths: List[File]): List[File] = { + + if (numPaths <= 0) { + paths + } else { + val path = Utils.createTempDir() + path.delete() + addPaths(numPaths - 1, path :: paths) + } + } + + val paths = addPaths(numPaths, List.empty) + + try { + f(paths) + } finally { + paths.foreach(path => Utils.deleteRecursively(path)) + } + } --- End diff -- I personally think It's strange to use a recursive function, does the following modified function work for your test? ``` protected def withTempDirs(num: Int)(body: Seq[File] => Unit) { val files = mutable.Buffer[File]() for (i <- 0 until num) { files += Utils.createTempDir().getCanonicalFile } try { body(files) } finally { files.foreach(Utils.deleteRecursively) } } ```
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