clickhouse
https://github.com/yandex/clickhouse
C++
ClickHouse is a free analytic DBMS for big data.
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- Issues
- Add `system.table_settings`, `system.engine_settings` and `SHOW TABLE SETTINGS`
- Support DateTime64 in sequenceMatch, sequenceCount and sequenceMatchEvents
- Make `checkStackSize` aware of the running coroutine's stack
- Do not drop an alias-keyed additional_table_filters entry with parallel replicas
- Decide read-in-order NaN placement from the direction the key is read in
- Add ddl_workload setting to schedule DDL queries under a separate workload
- Fix time series table accessors on parallel replicas
- MergeTree: do not mutate an empty part that cleanup is about to drop
- Leave a correlated subquery alone when it is resolved from the cache
- Compact part without `default_compression_codec.txt` is unattachable after the ZSTD default flip: the Compact leg of `detectDefaultCompressionCodec` probes per-column streams that never exist (passes only for a column literally named `data`)
- Docs
- C++ not yet supported