clickhouse
https://github.com/yandex/clickhouse
C++
ClickHouse is a free analytic DBMS for big data.
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- Issues
- obfuscateQuery: option to obfuscate common-word identifiers (keep_words leaks real names that are dictionary words)
- Fix logical error "Inconsistent AST formatting" on a function name containing query parameters
- Wrong results: GROUP BY on the partition key with a WHERE filter is served from _minmax_count_projection and collapses all groups into one
- obfuscateQuery: expose stateful/batch obfuscation (the only consistent + collision-free mode is a single pass, which doesn't scale)
- Add profile events for query analysis, query tree, and planning durations
- fix(promql): Apply Prometheus Query API query_log tracking (#99475)
- Fix session_timezone ignored on LowCardinality(DateTime)
- Fix wrong ORDER BY for LowCardinality(Float) with NaN in read-in-order
- Explain analyze
- Add regression test for session_timezone on LowCardinality(DateTime)
- Docs
- C++ not yet supported