clickhouse
https://github.com/yandex/clickhouse
C++
ClickHouse is a free analytic DBMS for big data.
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- Issues
- Plan-based parallel replicas: GLOBAL JOIN reads the base table instead of the shipped temporary table, computing ALIAS columns twice
- CoalescingMergeTree accepts lightweight UPDATE but a coalescing merge silently drops or mis-applies the acked update
- `TTLDrop` can process very large expired parts in one merge while still allocating read resources
- Release pull request for branch 26.8
- ```clusterAllReplicas()``` requires ```SHOW COLUMNS``` on system tables when ```select_from_system_db_requires_grant=false```
- Fiddle icon is less visible after the UI redesign
- Add a regression test for the LowCardinality primary-key bad cast during a pending ALTER
- Fix the type of a defaulted Nested member subcolumn under shared offsets
- Serialize typed DateTime64 JSON leaf as exact text string in AST literals
- Include disk I/O throughput in clickhouse-client's live progress/resource-usage line
- Docs
- C++ not yet supported