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* fix(aggregation, disk-based): MCOL-5689 this fixes disk-based distinct aggregation functions Previously disk-based distinct aggregation functions produced incorrect results b/c there was no finalization applied for previous generations stored on disk. * fix(aggregation, disk-based): Fix disk-based COUNT(DISTINCT ...) queries. (Case 2). (Distinct & Multi-Distinct, Single- & Multi-Threaded). * fix(aggregation, disk-based): Fix disk-based DISTINCT & GROUP BY queries. (Case 1). (Distinct & Multi-Distinct, Single- & Multi-Threaded). --------- Co-authored-by: Theresa Hradilak <theresa.hradilak@gmail.com> Co-authored-by: Roman Nozdrin <rnozdrin@mariadb.com>