clickhouse
https://github.com/yandex/clickhouse
C++
ClickHouse is a free analytic DBMS for big data.
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- Issues
- Orphan repair rewrites `numChildren` the log-tail guard never checks
- `groupArrayInsertAt` state with a `Decimal` default: the type name does not round-trip, the table rejects its own states after a restart
- Add `system.engine_settings`
- Iceberg v1→v2 upgrade: INSERT corrupts v2 manifest list with v1 union counts
- Type-strict `Field` dedup of `EmbeddedRocksDB` lookup keys duplicates rows
- EmbeddedRocksDB IN subquery drops rows when set element type is coarser than key
- Retried single-replica `UPDATE` in `Replicated` DB never writes `finished`
- PostgreSQL subquery pushdown backticks `ROLLUP`/`CUBE`, PostgreSQL rejects it
- Totals(T) type: a marker for ROLLUP/CUBE/GROUPING SETS subtotal rows that can't clash with real key values
- PromQL: rejected selector followed by `offset`/`@` throws `LOGICAL_ERROR`
- Docs
- C++ not yet supported