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Andrew Gierth b5635948ab Support hashed aggregation with grouping sets. ... This extends the Aggregate node with two new features: HashAggregate can now run multiple hashtables concurrently, and a new strategy MixedAggregate populates hashtables while doing sorted grouping. The planner will now attempt to save as many sorts as possible when planning grouping sets queries, while not exceeding work_mem for the estimated combined sizes of all hashtables used. No SQL-level changes are required. There should be no user-visible impact other than the new EXPLAIN output and possible changes to result ordering when ORDER BY was not used (which affected a few regression tests). The enable_hashagg option is respected. Author: Andrew Gierth Reviewers: Mark Dilger, Andres Freund Discussion: https://postgr.es/m/87vatszyhj.fsf@news-spur.riddles.org.uk		9 years ago
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binaryheap.h	Update copyright via script for 2017	9 years ago
bipartite_match.h	Update copyright via script for 2017	9 years ago
hyperloglog.h	Update copyright via script for 2017	9 years ago
ilist.h	Update copyright via script for 2017	9 years ago
knapsack.h	Support hashed aggregation with grouping sets.	9 years ago
pairingheap.h	Update copyright via script for 2017	9 years ago
rbtree.h	Update copyright via script for 2017	9 years ago
simplehash.h	Make simplehash.h grow hashtable in additional cases.	9 years ago
stringinfo.h	Update copyright via script for 2017	9 years ago