clickhouse
https://github.com/yandex/clickhouse
C++
ClickHouse is a free analytic DBMS for big data.
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- Issues
- Check the `RECOMPRESS` codec in `CREATE TABLE ... TTL` against the settings of the query and the session
- Fix `max_rows_to_read` with projection indexes and partial projections
- Skip repeated values of a LowCardinality argument in uniq, uniqExact, uniqHLL12, uniqTheta, min, max and groupUniqArray without GROUP BY
- Do not abort startup when a local disk was marked broken
- MySQL interface: Connector/J 9.x fails on connect with "Buffer length is less than expected payload length" (5.1.49 works)
- Do not refuse projections on a server with a small background pool
- Memory tracker counts jemalloc's freed pages as used, so a heavy query started right after another spills to disk
- LowCardinality columns with a few times more distinct values per part than the 8192-key dictionary bound read up to 14x slower; raise the bound at merge when values change from granule to granule
- A projection over a time-zone-dependent expression returns stale values after `MODIFY COLUMN` changes only the time zone
- Forbid changing the time zone of a column used in a key expression of a `MergeTree` table
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