Github user AndreSchumacher commented on a diff in the pull request:
https://github.com/apache/spark/pull/195#discussion_r10867923
--- Diff:
sql/core/src/main/scala/org/apache/spark/sql/parquet/ParquetTableOperations.scala
---
@@ -210,3 +220,47 @@ case class InsertIntoParquetTable(
}
}
+// TODO: this will be able to append to directories it created itself, not
necessarily
+// to imported ones
+class AppendingParquetOutputFormat(offset: Int) extends
parquet.hadoop.ParquetOutputFormat[Row] {
+ // override to accept existing directories as valid output directory
+ override def checkOutputSpecs(job: JobContext): Unit = {}
+
+ // override to choose output filename so not overwrite existing ones
+ override def getDefaultWorkFile(context: TaskAttemptContext, extension:
String): Path = {
+ val taskId: TaskID = context.getTaskAttemptID.getTaskID
+ val partition: Int = taskId.getId
+ val filename = s"part-r-${partition + offset}.parquet"
+ val committer: FileOutputCommitter =
+ getOutputCommitter(context).asInstanceOf[FileOutputCommitter]
+ new Path(committer.getWorkPath, filename)
+ }
+}
+
+object FileSystemHelper {
--- End diff --
OK, yes, good point.
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