Github user jinxing64 commented on a diff in the pull request:
https://github.com/apache/spark/pull/18541#discussion_r126342950
--- Diff:
core/src/main/java/org/apache/spark/util/collection/unsafe/sort/UnsafeExternalSorter.java
---
@@ -589,29 +589,51 @@ public long getKeyPrefix() {
}
/**
- * Returns a iterator, which will return the rows in the order as
inserted.
+ * Returns an iterator starts from startIndex, which will return the
rows in the order as
+ * inserted.
*
* It is the caller's responsibility to call `cleanupResources()`
* after consuming this iterator.
*
* TODO: support forced spilling
*/
- public UnsafeSorterIterator getIterator() throws IOException {
+ public UnsafeSorterIterator getIterator(int startIndex) throws
IOException {
if (spillWriters.isEmpty()) {
assert(inMemSorter != null);
- return inMemSorter.getSortedIterator();
+ UnsafeSorterIterator iter = inMemSorter.getSortedIterator();
+ moveOver(iter, startIndex);
+ return iter;
} else {
LinkedList<UnsafeSorterIterator> queue = new LinkedList<>();
+ int i = 0;
for (UnsafeSorterSpillWriter spillWriter : spillWriters) {
- queue.add(spillWriter.getReader(serializerManager));
+ if (i + spillWriter.recordsSpilled() <= startIndex) {
+ i += spillWriter.recordsSpilled();
--- End diff --
Sure
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