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postgres-lambda-diff
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Robert Haas
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Commit 5dfc1981 introduced the use of a new type of hash table with linear reprobing for hash aggregates. Such a hash table behaves very poorly if keys are inserted in hash order, which does in fact happen in the case where a query use a Finalize HashAggregate node fed (via Gather) by a Partial HashAggregate node. In fact, queries with this type of plan tend to run effectively forever. Fix that by seeding the hash value differently in each worker (and in the leader, if it participates). Andres Freund and Robert Haas
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