Parallel replicas in ClickHouse now support leveraging projections to optimize query execution.
Why it matters
This feature enables queries executed on parallel replicas to utilize projections, which can improve performance by allowing more efficient data skipping and fewer read operations. It enhances query execution speed and resource usage especially for distributed or replicated tables.How to use it
To use this feature, ensure that your replicated table has projections defined. When running queries on parallel replicas, ClickHouse will automatically apply projections where beneficial without additional configuration.