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## Why inserts into materialized views are not idempotent?
ClickHouse® still does not have transactions. They will be implemented around 2022Q2.
ClickHouse® still does not have transactions. They were to be implemented around 2022Q2 but still not in the roadmap.
Because of ClickHouse materialized view is a trigger. And an insert into a table and an insert into a subordinate materialized view it's two different inserts so they are not atomic altogether.