clickhouse
https://github.com/yandex/clickhouse
C++
ClickHouse is a free analytic DBMS for big data.
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- Issues
- UNIQUE KEY: DDL, metadata, and policy gates (1/N)
- Refreshable MV: avoid duplicate refresh on brief keeper connection loss
- Removed enabled column in system.failpoints system table
- Make query_plan_use_logical_join_step setting obsolete
- Replace PREWHERE in timeSeriesSelector
- Simplify initializing prometheus services in tests
- `isNumber(removeNullable(type))` in `PrettyBlockOutputFormat` does not strip `LowCardinality`, so `LowCardinality(numeric)` columns skip digit-group highlighting while plain or `Nullable` numeric columns are highlighted
- `trivial_limit = 1 + max_rows` triggers `TOO_MANY_ROWS` for boundary case `LIMIT N` with `max_rows_to_read = N`
- `getClientHTTPHeader` leaks HTTP Basic Auth credentials because filter checks `"authentication"` instead of `"authorization"`
- Add shared scan optimization for self-joins
- Docs
- C++ not yet supported