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Original file line number Diff line number Diff line change
Expand Up @@ -72,6 +72,13 @@ static GroupByHash createGroupByHash(

Work<?> addPage(Page page);

/**
* The order of new group ids need to be the same as the order of incoming rows,
* i.e. new group ids should be assigned in rows iteration order
* Example:
* rows: A B C B D A E
* group ids: 1 2 3 2 4 1 5
*/
Work<GroupByIdBlock> getGroupIds(Page page);

boolean contains(int position, Page page, int[] hashChannels);
Expand Down