clickhouse
https://github.com/yandex/clickhouse
C++
ClickHouse is a free analytic DBMS for big data.
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- Issues
- Report all skip indices broken by a forbidden column DROP/ALTER
- Fix reading v1 patch parts that both update a column added by `ADD COLUMN`
- Keep lightweight `UPDATE` values in `MATERIALIZE COLUMN` of a column the part does not store
- group_by_use_nulls self-join: one alias's keys read the other alias's column
- HAVING/SELECT/ORDER BY on toYear/dictGet GROUP BY key crashes or drops rows
- Constant-folded tuple GROUP BY key throws THERE_IS_NO_COLUMN over shards
- `CREATE TABLE ... ON CLUSTER ... AS <table>` fails with `UNKNOWN_DATABASE` on a node without the source table
- Move SYSTEM query commands from InterpreterSystemQuery into SystemCommandFactory
- Count statement, dictionary, window function and system log docs in the feature_docs hook
- Iceberg: TRUNCATE TABLE on Iceberg tables
- Docs
- C++ not yet supported