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https://issues.apache.org/jira/browse/DRILL-5457?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16022254#comment-16022254
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ASF GitHub Bot commented on DRILL-5457:
---------------------------------------
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.
> Support Spill to Disk for the Hash Aggregate Operator
> -----------------------------------------------------
>
> Key: DRILL-5457
> URL: https://issues.apache.org/jira/browse/DRILL-5457
> Project: Apache Drill
> Issue Type: Improvement
> Components: Execution - Relational Operators
> Affects Versions: 1.10.0
> Reporter: Boaz Ben-Zvi
> Assignee: Boaz Ben-Zvi
> Fix For: 1.11.0
>
>
> Support gradual spilling memory to disk as the available memory gets too
> small to allow in memory work for the Hash Aggregate Operator.
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