clickhouse
https://github.com/yandex/clickhouse
C++
ClickHouse is a free analytic DBMS for big data.
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- Issues
- `PREWHERE`-only column breaks `Merge` header match for a `Distributed` child
- Correlated subquery `LIMIT` over `numbers` truncates rows before `WHERE` runs
- LDAP user directory: one in-flight LDAP bind stalls all queries server-wide (storage mutex held across network call)
- fix(parsers): preserve WITH TABLES in SYSTEM DROP DATABASE REPLICA ... FROM ZKPATH and whole replica
- Background column-TTL merge wedges forever when a dependent MATERIALIZED column throws on the reset default (regression from #117815)
- max_rows_to_read / max_bytes_to_read silently ignored for file(), url(), s3() and object-storage reads
- Plain MergeTree silently and permanently loses a column's data when a partition is detached before RENAME COLUMN and re-attached after it
- Concurrent partition-scoped ALTERs deadlock the replication queue forever via max_replicated_mutations_in_queue
- Parallel replicas return a wrong count() for a primary-key range predicate: the exact-count optimization's granules are dropped from the result
- TTL DELETE WHERE ignores session_timezone: DateTime string literal evaluated in server timezone, wrong rows silently deleted while the identical mutation predicate is rewritten
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