clickhouse
https://github.com/yandex/clickhouse
C++
ClickHouse is a free analytic DBMS for big data.
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- Issues
- Statistics creation on JSON columns
- `S3Queue` ignores `s3queue_`-prefixed format settings when parsing
- `RESTORE` of a `MySQL` table or database fails with "has a different definition" when the session sets `mysql_datatypes_support_level`
- ClickHouse S3 store does not enable modern digest modes (SHA-256) for batch DeleteObjects etc ` x-amz-checksum-*` headers
- Skip the targeted job when CIDB is unavailable during test selection
- Temporary filesystem cache mode for the experimental `ReaderExecutor`
- Text index: an FM-index over the dictionary so that `LIKE '%needle%'` reads only the blocks that can match
- Add experimental `ByteReverse` compression codec
- Add the rows of a sparse argument in their order for order-dependent aggregate functions
- Log only final S3 request errors with level error, everything else with info/trace
- Docs
- C++ not yet supported