clickhouse
https://github.com/clickhouse/clickhouse
C++
ClickHouse is a free analytics DBMS for big data
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- Issues
- Optimize bucketed LowCardinality map reconstruction
- Enable `optimize_if_transform_strings_to_enum` by default
- Test: merge memory is not bounded by max_memory_usage (merge OOM repro)
- Prune named-Tuple subfields whose values are all type-defaults at INSERT and merge
- Local-primary cloud-backed disk for MergeTree using ephemeral SSD plus object-storage mirror
- Slightly optimize JSON typed paths default insertion during INSERT
- Use a lock-free queue for asynchronous logging
- Simplify and optimize building of posting lists in text index [3]
- Reject TTL expressions referencing AggregateFunction columns at DDL time
- Read the smallest on-disk column when a query reads no columns
- Docs
- C++ not yet supported