clickhouse
https://github.com/yandex/clickhouse
C++
ClickHouse is a free analytic DBMS for big data.
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- Issues
- Read the default of a column that a part does not hold, not a subcolumn of that name
- Do not remove another column's stream with a column dropped from a merged part
- Disarm the perturbation timer in `SYSTEM STOP THREAD FUZZER`
- Count packed skip-index archive index loads, and assert 04653 on that counter
- Do not re-probe a PromQL selector that is known not to match a whole metric
- `ORDER BY x WITH FILL TO nan` generates fill rows forever at default settings: the fill `TO` bound is never validated for `NaN`/`Inf`, unlike the data-side guards from #69261
- Misplaced SettingsChangesHistory entries: compatibility='26.8' reverts defaults that 26.8 shipped; compatibility='26.1' loses use_skip_indexes_on_data_read
- Account for rows read into the reverse read-in-order buffer
- Support hierarchical (dotted) database and table names
- GROUP BY CUBE/ROLLUP drops repeated grouping keys, losing grouping sets
- Docs
- C++ not yet supported