clickhouse
https://github.com/yandex/clickhouse
C++
ClickHouse is a free analytic DBMS for big data.
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- Issues
- Replicated database: a new/recovering replica wedges on tables whose ZooKeeper metadata exceeds max_query_size
- toDayOfWeek over a timezone-carrying DateTime primary key silently drops rows (monotonicity computed in server timezone, values in column timezone)
- Shared memory interface for executable UDFs
- BACKUP of a lazy-loaded (lazy_load_tables=1) MergeTree/ReplicatedMergeTree table silently backs up no data
- Fix a valid `JOIN ON` query rejected by the redundant-comparison optimization
- KeyCondition over-prunes the signed-zero granule for f = 0.0 when the primary key is an injective float transform
- Declare every geometry function's argument domain once, in `getReturnTypeImpl`
- mergeTreeAnalyzeIndexes: a malformed args_array argument raises a logical error (subquery) or a raw boost out_of_range (bare literal) instead of BAD_ARGUMENTS
- Do not prune a comparison of a value that carries its own type
- Do not let index analysis fail a query on a subexpression it cannot evaluate
- Docs
- C++ not yet supported