Grouping algorithms compute a summary of their input. They are applicable only if the query contains a GROUP BY clause, or
if the query contains aggregate functions (such as
SELECT COUNT(*) FROM T).
HashGroupBy algorithm (GrByH)
ClusteredHashGroupBy algorithm (GrByHClust)
HashGroupBySets algorithm (GrByHSets)
OrderedGroupBy algorithm (GrByO)
OrderedGroupBySets algorithm (GrByOSets)
SingleRowGroupBy algorithm (GrByS)
SortedGroupBySets algorithm (GrBySSets)
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