clickhouse
https://github.com/yandex/clickhouse
C++
ClickHouse is a free analytic DBMS for big data.
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- Issues
- Add `hasAnyTokenRegexp` function with text index support
- has/hasAny/hasAll are slow with large constant arrays
- Reading `system.stack_trace` twice in one query hangs and blocks later reads
- Support hot-reload of CA certificate (caConfig) for interserver TLS without server restart
- `length(arrayFilter)` rewrite stops pruning by keys/indexes on that expression
- CHECK ALL TABLES skips MergeTree tables in lazy_load_tables databases
- `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
- Docs
- C++ not yet supported