Github user adeneche commented on a diff in the pull request:
https://github.com/apache/drill/pull/160#discussion_r39758626
--- Diff:
exec/java-exec/src/main/java/org/apache/drill/exec/physical/impl/xsort/ExternalSortBatch.java
---
@@ -478,28 +498,36 @@ public BatchGroup
mergeAndSpill(LinkedList<BatchGroup> batchGroups) throws Schem
break;
}
BatchGroup batch = batchGroups.pollLast();
+ assert batch != null;
--- End diff --
please add a message to the assertion, it will make our life easier if this
assertion throws
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