clickhouse
https://github.com/yandex/clickhouse
C++
ClickHouse is a free analytic DBMS for big data.
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- Issues
- Parallel-replicas `INSERT SELECT` route forwards a materialized CTE as the initiator's `_materialized_cte_*` temporary table
- Kafka engine: KafkaSource takes IStorage::id_mutex once per row (for `_table`), so consumers of one table contend on it
- TSan: heap-use-after-free of a dropped `StorageDistributed` in `calculateHashTableCacheKeys` during `EXPLAIN` join optimization
- Overlap packed-part uploads across partitions
- Fix: Float32 narrowing in time-series linear regression
- only_enums gate matches top-level Enum only: Nullable(Tuple(Enum)) still throws 691
- New mapContainsValue shadow guard untestable via file(): 05210 passes without it
- Fix: Check embedded dictionary privilege for ON CLUSTER
- Filter `PartsSplitter` layers on the key columns the sorting expression computed
- GLOBAL JOIN ... USING an ALIAS column throws 47 `using identifier cannot be resolved from right table expression` (the broadcast temporary table lacks the ALIAS column; ON works)
- Docs
- C++ not yet supported