clickhouse
https://github.com/yandex/clickhouse
C++
ClickHouse is a free analytic DBMS for big data.
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- Issues
- Read-in-order before projections kills projection-index filtering of the base read
- Size header charged against a 16-byte read window: ssd_cache disk reads throw
- Keeper: put deserialized values in log_entry instead of a separate cache
- MemoryTracking grows continuously and is never released
- TTL widening applies to source columns only: toStartOfDay/toMonday re-narrow and still drop rows
- Experimental catalog_type='jdbc': read Iceberg JdbcCatalog directly from Postgres
- Can't unwrap a UDF result into columns when the number of columns varies by row
- Pending CLEAR COLUMN IN PARTITION is applied at read time to parts of all partitions on non-replicated MergeTree
- Fix one-minute shutdown delay after writing an access entity to disk
- Mixed conditions with partial merge
- Docs
- C++ not yet supported