Github user Ben-Zvi commented on a diff in the pull request:
https://github.com/apache/drill/pull/822#discussion_r118154367
--- Diff:
exec/java-exec/src/main/java/org/apache/drill/exec/record/RecordBatch.java ---
@@ -188,6 +188,18 @@
NOT_YET,
/**
+ * Restart reading incoming batches.
+ * <p>
+ * Prior calls to {@link #next()} returned data after all incoming
batches were processed.
+ * But with this status, need to restart reading incoming
RecordBatches.
+ * </p>
+ * <p>
+ * Currently only used internally by the Hash Aggregate.
+ * </p>
+ */
--- End diff --
The whole iterator driven next() model is very limiting. This change was
the simplest - re-invoking the next next() so that spilled partitions could be
processed from then on.
Trying to switch without returning from the next() first seems too complex.
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