clickhouse
https://github.com/yandex/clickhouse
C++
ClickHouse is a free analytic DBMS for big data.
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- Issues
- REPLACE PARTITION silently degrades to ATTACH across publish retries, so a racing INSERT survives it
- Failed REPLACE PARTITION leaves old and new rows both active in ReplicatedMergeTree
- REPLACE PARTITION reports failure for a committed publish when the post-publish queue refresh fails
- ATTACH PARTITION ALL FROM partially publishes partitions when a later partition fails
- Failed MOVE PARTITION TO TABLE removes the source partition from the initiator with no DROP_RANGE record
- `url` `ArrowStream` reads fail on HEAD 501: new seekability probe rethrows
- 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
- Docs
- C++ not yet supported