clickhouse
https://github.com/yandex/clickhouse
C++
ClickHouse is a free analytic DBMS for big data.
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- Issues
- Lazy-loaded (lazy_load_tables=1) ReplicatedMergeTree replica misreports as up-to-date, causing silent stale distributed reads after a restart
- Enum partition value still resolves to the number: DROP PARTITION hits another partition
- /play sends credentials in URL query parameters
- Nondeterministic functions (`rand`, `generateUUIDv4`, `generateSnowflakeID`, ...) return one value per dictionary key when applied to a `LowCardinality` column
- AST fuzzer oracle suite (2/4): identity/state/schema oracles + OracleRunner + relaxable gate
- AST fuzzer oracle suite (3/4): mutation, grouping-modifier, ARRAY JOIN, row-policy oracles
- AST fuzzer oracle suite (4/4): remaining oracles (complete suite)
- Add graph view for explain plan
- Release zero-copy locks of the dropped replica in SYSTEM DROP REPLICA
- `multiMatchAny` silently drops all but one member of a negated character class (wrong results vs `match`)
- Docs
- C++ not yet supported