Github user cloud-fan commented on a diff in the pull request:
https://github.com/apache/spark/pull/10498#discussion_r48953481
--- Diff:
sql/core/src/main/scala/org/apache/spark/sql/execution/datasources/WriterContainer.scala
---
@@ -335,6 +339,121 @@ private[sql] class DynamicPartitionWriterContainer(
val partitionName = Literal(c.name + "=") :: str :: Nil
if (i == 0) partitionName else Literal(Path.SEPARATOR) ::
partitionName
}
+ }
+
+ private def getBucketIdFromKey(key: InternalRow): Option[Int] = {
+ if (bucketSpec.isDefined) {
+ Some(key.getInt(partitionColumns.length))
+ } else {
+ None
+ }
+ }
+
+ private def sameBucket(key1: UnsafeRow, key2: UnsafeRow): Boolean = {
+ val bucketIdIndex = partitionColumns.length
+ if (key1.getInt(bucketIdIndex) != key2.getInt(bucketIdIndex)) {
+ false
+ } else {
+ var i = partitionColumns.length - 1
+ while (i >= 0) {
+ val dt = partitionColumns(i).dataType
+ if (key1.get(i, dt) != key2.get(i, dt)) return false
+ i -= 1
+ }
+ true
+ }
+ }
+
+ private def sortBasedWrite(
+ sorter: UnsafeKVExternalSorter,
+ iterator: Iterator[InternalRow],
+ getSortingKey: UnsafeProjection,
+ getOutputRow: UnsafeProjection,
+ getPartitionString: UnsafeProjection,
+ outputWriters: java.util.HashMap[InternalRow, OutputWriter]): Unit =
{
+ while (iterator.hasNext) {
+ val currentRow = iterator.next()
+ sorter.insertKV(getSortingKey(currentRow), getOutputRow(currentRow))
+ }
+
+ logInfo(s"Sorting complete. Writing out partition files one at a
time.")
+
+ val needNewWriter: (UnsafeRow, UnsafeRow) => Boolean = if
(sortColumns.isEmpty) {
+ (key1, key2) => key1 != key2
+ } else {
+ (key1, key2) => key1 == null || !sameBucket(key1, key2)
+ }
+
+ val sortedIterator = sorter.sortedIterator()
+ var currentKey: UnsafeRow = null
+ var currentWriter: OutputWriter = null
+ try {
+ while (sortedIterator.next()) {
+ if (needNewWriter(currentKey, sortedIterator.getKey)) {
+ if (currentWriter != null) {
+ currentWriter.close()
+ }
+ currentKey = sortedIterator.getKey.copy()
+ logDebug(s"Writing partition: $currentKey")
+
+ // Either use an existing file from before, or open a new one.
+ currentWriter = outputWriters.remove(currentKey)
+ if (currentWriter == null) {
+ currentWriter = newOutputWriter(currentKey, getPartitionString)
+ }
+ }
+
+ currentWriter.writeInternal(sortedIterator.getValue)
+ }
+ } finally {
+ if (currentWriter != null) { currentWriter.close() }
+ }
+ }
+
+ /**
+ * Open and returns a new OutputWriter given a partition key and
optional bucket id.
+ * If bucket id is specified, we will append it to the end of the file
name, but before the
+ * file extension, e.g.
part-r-00009-ea518ad4-455a-4431-b471-d24e03814677-00002.gz.parquet
--- End diff --
Shall we put the bucket id at the very last? i.e. after the file extension,
so that it's much easier to get the bucket id given a file name. e.g.
`part-r-00009-ea518ad4-455a-4431-b471-d24e03814677.gz.parquet.00002`
cc @nongli
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