clickhouse
https://github.com/yandex/clickhouse
C++
ClickHouse is a free analytic DBMS for big data.
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- Issues
- Replicated database: Stuck DDL after a failed DROP DATABASE
- Fix use-after-dtor logic in HashTable destroyElements
- ALTER TABLE xxx MATERIALIZE COLUMNS/INDEXES/PROJECTIONS
- Logical error: Queries with distributed_group_by_no_merge=1 should be processed to Complete stage
- MergeTree: more efficient read operations for small data volumes
- isIPv4String Function validating strings that are not proper IPv4 strings
- Low uniqMerge performance issue in Materialized aggregatingMergetree
- FINAL on table with is_deleted works 10-30 times slower than expected
- Autocast Strings to Int for Enum for JSON
- Why I do not need SELECT on all source tables to select from mv with PASTE JOIN
- Docs
- C++ not yet supported