General questions about ClickHouse

• What is ClickHouse?

• Why is ClickHouse so fast?

• Who is using ClickHouse?

• What does "ClickHouse" mean?

• What does "Не тормозит" mean?

• What is OLAP?

• What is a columnar database?

• How do I choose a primary key?

• Why not use something like MapReduce?

• How do I contribute code to ClickHouse?

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