clickhouse
https://github.com/yandex/clickhouse
C++
ClickHouse is a free analytic DBMS for big data.
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- Issues
- CLI options: support non breaking space, soft hyphen and dash characters.
- Inconsistent enum8 structure after ALTER UPDATE: CANNOT_CONVERT_TYPE on SELECT
- Repeated queries sent to JDBC brige
- A query in clickhouse-local shows zero CPU metric while processing .json.gz which is obviously wrong.
- ATTACH_TASK can be blocked by FETCH_TASK because of shared `background_fetches_pool_size` value
- Count query in quota limits only if query match specific conditions.
- Experiment with `-ftime-trace` during build
- Parallel formatting should be disabled if there are many files to insert.
- Query tags: tags column in system.query_log
- SimpleAggregateFunction with groupUniqArrayArray should support Array(LowCardinality(String))
- Docs
- C++ not yet supported