clickhouse
https://github.com/yandex/clickhouse
C++
ClickHouse is a free analytic DBMS for big data.
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- Issues
- WASM UDF: a module that does not export its linear memory as `memory` is accepted and fails only on first call
- Use the primary index for tuple key for comparisons like ORDER BY (a, (b, c))
- Add --dump-schema option to clickhouse-client and clickhouse-local
- Parallelize keyed uniqExact state merges by destination
- PostgreSQL progress callback chains onto dead stack frames: row count multiplied by statement index
- PromQL lexer needs a newline to close a comment: `up # x` gets HTTP 400
- Primary-key analysis on a Tuple(Nullable(...)) key drops every granule for a whole-tuple comparison when the data contains NULL — matching rows silently missing (allow_nullable_key)
- Logical error: Cannot alter table A metadata doesn't have structure (STID: 3623-38a4)
- Signing of docker images with cosign
- Feat(Math): Add support for big integers in `bitTest*`
- Docs
- C++ not yet supported