clickhouse
https://github.com/yandex/clickhouse
C++
ClickHouse is a free analytic DBMS for big data.
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- Issues
- Add test: `JSONExtractKeysAndValues` with non-constant `LowCardinality` JSON input column is untested
- Add test: `indexOf` and `countEqual` with constant non-NULL array and `Nullable` value column carrying NULLs is untested
- Add test: Concurrent `ALTER ... UPDATE` + `REPLACE PARTITION` on `ReplicatedMergeTree` exercising the new initiator-side intent + cancelInPartition guards
- Add test: New `BAD_ARGUMENTS` validation for `SHARD_LOAD_QUEUE_BACKLOG <= 0` in `HASHED_ARRAY` registration is untested
- Optimize row order if no order by
- Add long tag to 00446_clear_column_in_partition_concurrent_zookeeper
- Puffin file reader
- CI: only react to human-added must-backport labels
- CLAUDE.md: discourage fallback paths, prefer fail-close
- Fix abort when nested coalesce is used with skip-index disjunction tracking
- Docs
- C++ not yet supported