Github user cloud-fan commented on a diff in the pull request: https://github.com/apache/spark/pull/21257#discussion_r186605552 --- Diff: sql/core/src/main/scala/org/apache/spark/sql/execution/datasources/InsertIntoHadoopFsRelationCommand.scala --- @@ -207,9 +207,25 @@ case class InsertIntoHadoopFsRelationCommand( } // first clear the path determined by the static partition keys (e.g. /table/foo=1) val staticPrefixPath = qualifiedOutputPath.suffix(staticPartitionPrefix) - if (fs.exists(staticPrefixPath) && !committer.deleteWithJob(fs, staticPrefixPath, true)) { - throw new IOException(s"Unable to clear output " + - s"directory $staticPrefixPath prior to writing to it") + + // check if delete the dir or just sub files + if (fs.exists(staticPrefixPath)) { + // check if is he table root, and record the file to delete + if (staticPartitionPrefix.isEmpty) { + val files = fs.listFiles(staticPrefixPath, false) + while (files.hasNext) { + val file = files.next() + if (!committer.deleteWithJob(fs, file.getPath, true)) { --- End diff -- > deleteMatchingPartitions happend only if overwrite is specified. I mean, we should only do it if overwriting the same table.
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