clickhouse
https://github.com/yandex/clickhouse
C++
ClickHouse is a free analytic DBMS for big data.
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- Issues
- Add an <http> external user directory backed by http_authentication_servers
- Add ProfileEvents for aggregation merge observability
- NaN inside a Tuple constant escapes the comparison-chain pruning NaN guard: `optimize_redundant_comparisons` returns extra rows at pure defaults
- Join Rows Estimation in Join Reordering Algorithm: make dead code work
- Backport #109199 to 26.3
- Serialize `SYSTEM RESTORE DATABASE REPLICA` against in-flight replicated DDL
- MergeTree to ReplicatedMergeTree conversion silently fails and leaves the table read-only forever under lazy_load_tables
- Lazy-loaded MergeTree/ReplicatedMergeTree tables are permanently missing from system.parts, system.replicas and related system tables after a restart (lazy_load_tables=1)
- DeltaLake (delta-kernel): data-file scan, CDF reads and writes still wait on the kernel FFI without any cancellation point or timeout (only the snapshot load is covered by #117431)
- DeltaLakeAzure (delta-kernel): `azure_connect_timeout_ms` / `azure_request_timeout_ms` never reach the kernel's object store client (S3 forwards them since #117431)
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