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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