clickhouse
https://github.com/yandex/clickhouse
C++
ClickHouse is a free analytic DBMS for big data.
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- Issues
- Bump `silk` to the latest `clickhouse-public`
- Column IDs for MergeTree: the addressing refactor
- Add `system.sessions` table
- Nullable LHS defeats the no-supertype cast guard: nullIn(NULL, 'x') returns 1
- View pushdown force-disables `extremes`, dropping the block on single-shard clusters
- Pushdown applies view-level `FINAL`/`SAMPLE` to shards: row set changes, `ILLEGAL_FINAL`
- Speed up window functions by evaluating each `MergeTree` partition independently
- HTTP session does not pick up newly granted nested role privileges until reconnect
- Explain analyze estimate and actual cost
- Cherry pick #112327 to 25.8: Fix use-after-free on a sparse join key in a direct dictionary join
- Docs
- C++ not yet supported