clickhouse
https://github.com/yandex/clickhouse
C++
ClickHouse is a free analytic DBMS for big data.
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- Issues
- Evaluate a materialized view's scalar subquery per block when it reads the source through `loop`, `merge` or `executable`
- Hash and sort an `IN` set once per query for the Parquet dictionary and bloom filters
- Track SQLLogic compatibility with managed exclusion manifests
- Fix `UNION`/`INTERSECT`/`EXCEPT` branches keeping their own `Decimal` precision or time zone
- Fix `LOGICAL_ERROR` when a `Buffer` table writes into an Iceberg table whose stored schema differs from its DDL
- Expand sparse `String` columns to full ones in one pass
- Docs: fix inverted description of the adaptive async insert timeout
- Keep sizes of Nested arrays when a column TTL resets a subcolumn
- Hash long strings several at a time in the radix partitioned `uniqExact`
- Execute `IN` and `EXISTS` subqueries of mutations on the initiator with `mutations_execute_subqueries_on_initiator`
- Docs
- C++ not yet supported