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08eb853a96
This change adds support for PER PARTITION LIMIT for aggregate queries. result_set_builder gets two new functions handling partition start and end: - accept_partition_end for notifying that a partition has been finished. This is also called when a page ends, so we cannot simply flush here, as a naive implementation could do. - accept_new_partition, where we flush_selectors() if it's indeed a new partition (and not a continuation of the previous) and the query has a grouping: we don't want to flush on new partition in a query like SELECT COUNT(*) FROM foo;