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HashAggregate

Short Description

The HashAggregate node builds a hash table to group data

Detailed Description

Unlike the GroupAggregate node, HashAggregate does not require pre-sorted input as it builds a hash table (or a number of hash tables) to group data. This node can be seen in GROUP BY operations. HashAggregate operations can consume large amounts of memory as they build the hash table(s) and the output is in no particular order.

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