clickhouse
https://github.com/yandex/clickhouse
C++
ClickHouse is a free analytic DBMS for big data.
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- Issues
- Do not lazily execute runningAccumulate as a short-circuit argument
- Skip the aggregate state round-trip for single-row groups in `AggregatingSortedAlgorithm`
- Support dynamic type in parquet reader
- Apply a monotonic function chain once per granule in index analysis, not once per condition atom
- Cache deserialized granules of bloom filter skip indexes
- Inject a nested Iceberg identity partition value into the column the reader carries
- optimize_skip_unused_shards_rewrite_in rewrites IN in the SELECT projection, throwing NOT_FOUND_COLUMN_IN_BLOCK instead of returning rows
- optimize_trivial_group_by_limit_query silently drops an explicit max_rows_to_group_by throw limit (default group_by_overflow_mode is not treated as a contract)
- Vector similarity index cache over-accounts entries by ~45x, silently degrading to a 0% hit rate
- optimize_rewrite_regexp_functions rewrites replaceRegexpAll to replaceRegexpOne for multi-match $-anchored patterns ((?m) multiline, empty-matching tails) — replacements silently lost
- Docs
- C++ not yet supported