flyrain commented on code in PR #6304:
URL: https://github.com/apache/iceberg/pull/6304#discussion_r1034212530
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api/src/main/java/org/apache/iceberg/ScanTaskGroup.java:
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@@ -26,6 +26,24 @@
* @param <T> the type of scan tasks
*/
public interface ScanTaskGroup<T extends ScanTask> extends ScanTask {
+ /**
+ * Returns a grouping key for this task group.
+ *
+ * <p>Tasks may produce records that belong to a specific group of data
(e.g. partition). It may
+ * be beneficial to preserve that grouping while combining tasks into groups
if query engines can
+ * leverage that information to avoid shuffles. Grouping keys indicate how
data is split between
Review Comment:
Nit:
`It may be beneficial to preserve that grouping while combining tasks into
groups if query engines can leverage that information to avoid shuffles.` ->
`Query engines could leverage the grouping key to avoid shuffles by
combining tasks within the same group.` ?
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