clickhouse
https://github.com/yandex/clickhouse
C++
ClickHouse is a free analytic DBMS for big data.
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- Issues
- data deleted using lightweight_update mode are resurected after backup/restore
- Potential issue: CREATE USER OR REPLACE requires only CREATE USER privilege when replacing an existing user
- Potential issue: `CREATE TABLE CLONE AS` command require `ALTER DELETE` privilege
- Maximum recursive CTE evaluation depth (1000) exceeded
- Local praktika runs can leave the repository in modified state
- UUIDv7 is NOT in a draft status as of September, 2025
- Logical error: 'Part ... with metadata version 1 contains column h that is absent in table alter_table0
- Azure grant source filter cannot be used to match storage account and container
- Incorrect data on `SELECT` from `metric_log` with `schema_type=transposed_with_wide_view` over `merge()`
- Logical error: 'Bad cast from type DB::ColumnNullable to DB::ColumnVector<char8_t>' with correlated subquery
- Docs
- C++ not yet supported