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Let's optimize one aggregate function in ClickHouse [ru]

Talk video

Talk presentation

Let's calculate an average of one column for each key, like the following query: SELECT key, avg(value) FROM table GROUP BY key. What can be more simple? But the question is: what is the most efficient way to do it? How to write code to achieve maximum performance on a variety of hardware?

Aleksei Milovidov
Clickhouse
  • Dev Lead at Yandex
  • Since 2008 has been developing data storage systems for Yandex Metrica
  • ClickHouse project founder and developer
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