clickhouse
https://github.com/yandex/clickhouse
C++
ClickHouse is a free analytic DBMS for big data.
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- Issues
- Column-based aggregate retention function (ex: net dollar retention)
- Unique insert Batch-ID for atomic inserts
- How to parse message which is an array of json from kafka and dont get DB::ParsingException: Cannot parse input: expected ']' before: 'json'
- Perfomance issues for mutation on many partitions
- Unexpected result: dictionary with not nullable attribute + OrDefault Null
- Try to find some configs for keeper-client
- Merge table function filesystem. Originally #42039. Originally #50208.
- Idea: CREATE AND RENAME IF EXISTS
- Replicated database engine: don't put IF (NOT) EXISTS queries into the queue when they are no-op.
- Each range costs additional S3::getObject call when reading from DiskEncrypted
- Docs
- C++ not yet supported