clickhouse
https://github.com/yandex/clickhouse
C++
ClickHouse is a free analytic DBMS for big data.
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- Issues
- Text index: serve `position(s, 'x') > 0` as `s LIKE '%x%'`
- WITH FILL emits rows outside FROM..TO when STEP overflows the column type
- ARRAY JOIN in an IN subquery splits the GROUP BY key: wrong ROLLUP row
- Fix reading ssd_cache dictionary entries from disk
- TRUNCATE ALL TABLES fails with NOT_IMPLEMENTED on Null, Merge and Buffer tables
- Encrypted custom disk checks the wrapped object-storage disk's metadata dir
- failpoints_disabled_in_tests check wrongly exempts no-parallel-replicas tests
- `clickhouse_json`: an AST carrying both `alias` and `parametrised_alias` formats as one query and executes as another
- Text index on `FixedString` with `String`-returning preprocessor drops all rows
- Text index prunes matching rows: decline keys on needle padding, not value's
- Docs
- C++ not yet supported