clickhouse
https://github.com/yandex/clickhouse
C++
ClickHouse is a free analytic DBMS for big data.
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- Issues
- Support `OVERLAY(string PLACING replacement FROM start FOR length)` function
- Support `FROM (VALUES (...), ...) AS alias(col, ...)` table value constructor
- Add setting to make `||` / `concat()` propagate NULL instead of treating it as empty string
- Add setting to make `CAST(NULL AS type)` return a typed NULL instead of the type's default value
- Support `SIMILAR TO` pattern matching predicate
- Support `UNIQUE(subquery)` predicate that tests for no duplicate rows
- Support `MATCH` predicate for referential integrity checks in queries
- Support compound interval literals: `INTERVAL 'h:mm' HOUR TO MINUTE`
- Support `SET TIME ZONE INTERVAL '±hh:mm' HOUR TO MINUTE` and `SET SESSION CHARACTERISTICS`
- Fix skip indexes on data read with patch parts
- Docs
- C++ not yet supported