Github user cloud-fan commented on a diff in the pull request: https://github.com/apache/spark/pull/16938#discussion_r103531754 --- Diff: sql/core/src/main/scala/org/apache/spark/sql/execution/datasources/DataSource.scala --- @@ -412,15 +412,28 @@ case class DataSource( // 2. Output path must be a legal HDFS style file system path; // 3. It's OK that the output path doesn't exist yet; val allPaths = paths ++ caseInsensitiveOptions.get("path") - val outputPath = if (allPaths.length == 1) { + val (outputPath, pathExists) = if (allPaths.length == 1) { val path = new Path(allPaths.head) val fs = path.getFileSystem(sparkSession.sessionState.newHadoopConf()) - path.makeQualified(fs.getUri, fs.getWorkingDirectory) + val qualifiedOutputPath = path.makeQualified(fs.getUri, fs.getWorkingDirectory) + (qualifiedOutputPath, fs.exists(qualifiedOutputPath)) } else { throw new IllegalArgumentException("Expected exactly one path to be specified, but " + s"got: ${allPaths.mkString(", ")}") } + if (pathExists) { --- End diff -- why we move this check from `InsertIntoHadoopFsRelationCommand` to here?
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