clickhouse
https://github.com/yandex/clickhouse
C++
ClickHouse is a free analytic DBMS for big data.
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- Issues
- `DROP IF EMPTY` asks lazy stand-in for `totalRows`: non-empty table dropped
- JSON AST DDL query fails on a `Replicated` database: the replica parses the DDL entry with `dialect = clickhouse_json`
- A pending patch part on any column disables direct read from text index for the whole query
- Lazy JSON type hint subcolumns return defaults on pre-ALTER parts
- Fix redundant parentheses in literal text parsing
- `ReadFromSealedViewStep::clone` copies an optimized plan: `Cannot clone Join`
- remote() read of SQLite/MySQL table fails with serialize_query_plan=1
- Record the granules excluded by skip indexes at data read time in the query condition cache
- TTL merge recomputes `MATERIALIZED` on all rows: `SummingMergeTree` sums change
- `UPDATE`-applied column TTL leaves `MATERIALIZED` dependents stale on Wide parts
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