Github user Ben-Zvi commented on a diff in the pull request:
https://github.com/apache/drill/pull/761#discussion_r103067184
--- Diff:
exec/java-exec/src/main/java/org/apache/drill/exec/physical/impl/xsort/managed/ExternalSortBatch.java
---
@@ -219,7 +220,18 @@
private BatchSchema schema;
+ /**
+ * Incoming batches buffered in memory prior to spilling
+ * or an in-memory merge.
+ */
+
private LinkedList<BatchGroup.InputBatch> bufferedBatches =
Lists.newLinkedList();
+
+ /**
+ * Spilled runs consisting of a large number of spilled
+ * in-memory batches.
--- End diff --
"spilled in-memory" is an oxymoron :-)
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