clickhouse
https://github.com/yandex/clickhouse
C++
ClickHouse is a free analytic DBMS for big data.
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- Issues
- PCO codec on Variant/LowCardinality fails INSERT into compact parts
- hash JOIN on LowCardinality keys up to 1.7x slower with residual/OR ON condition
- `json.^a` throws `BAD_ARGUMENTS`: sub-object type inherits root `SKIP` rules
- RowBinary `JSON(SKIP p)` insert drops `p_1` and keeps `p.*`: no `.` boundary
- Ship the join runtime filter key with the plan
- Native driver versions trigger incorrect analyzer downgrades on shards (25.8 / 26.9)
- Space-filling curve index analysis drops rows for `Dynamic` arguments with values >= 2^32
- Add a local MaxMindDB table engine with IPv4/IPv6 lookups (1/3)
- Count columns read only by PREWHERE in the MergeTree block size estimate
- Skip empty configuration files in `config.d` instead of failing to load the configuration
- Docs
- C++ not yet supported