clickhouse
https://github.com/yandex/clickhouse
C++
ClickHouse is a free analytic DBMS for big data.
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- Issues
- Check the query of `CREATE HANDLER` against its creator and support `DEFINER` / `SQL SECURITY` for handlers
- Fix `INSERT SELECT` from table functions when a `DEFAULT` reads a column the `INSERT` does not write
- Plan-based parallel replicas: do not ship a read of a temporary table
- Raise the per-type task limit of a background schedule pool when its size is increased at runtime
- Single node EXPLAIN PLAN tree = 1: draw plans as boxes
- Faster hash joins on a single `String` key with a large right side
- Check `READ ON URL` for redirect targets in the `url` table function
- Add whole batches at once in the quantileExact family
- Require `READ` and `WRITE` on the source to create a table from a table function
- Plan-based parallel replicas: keep filter fusion into `ARRAY JOIN` for steps that are not shipped
- Docs
- C++ not yet supported