aokolnychyi commented on code in PR #6304:
URL: https://github.com/apache/iceberg/pull/6304#discussion_r1035293785


##########
api/src/main/java/org/apache/iceberg/ScanTaskGroup.java:
##########
@@ -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:
   Reworked the doc.



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