clickhouse
https://github.com/yandex/clickhouse
C++
ClickHouse is a free analytic DBMS for big data.
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- Issues
- Add lexicographic Keeper list pagination with start_after
- Fix refreshes of refreshable materialized views whose inner table declares subcolumn codecs
- Do not re-create nested Tuple elements when creating a column for deserialization
- Fix `max_rows_to_read` with projection indexes and partial projections
- Do not abort startup when a local disk was marked broken
- Forbid changing the time zone of a column used in a key expression of a `MergeTree` table
- Use the top-K dynamic filter for `ORDER BY` of a single `LowCardinality(String)` column
- MySQL dictionary source: accept `socket` only in the configuration file, connect over TCP for DDL dictionaries
- GROUP BY over a near-unique key with ORDER BY count() DESC LIMIT n: bound group counts before counting them in the adaptive merge (lone-count top-K -27%, ClickBench Q32 -14%)
- Tighten seccomp policy for optional kernel interfaces
- Docs
- C++ not yet supported