clickhouse
https://github.com/yandex/clickhouse
C++
ClickHouse is a free analytic DBMS for big data.
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- Issues
- 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
- Pending async inserts into `Distributed` become permanently undeliverable after `RENAME COLUMN` and wedge all later sends
- Iceberg: a table identity-partitioned by a `uuid` column returns wrong results and cannot be read — the manifest's raw `fixed[16]` partition value is never decoded
- 26.9 regression: a pending `ALTER UPDATE`/`DELETE` referencing an `ALIAS` column makes every read with `apply_mutations_on_fly` throw `NO_SUCH_COLUMN_IN_TABLE`
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