clickhouse
https://github.com/yandex/clickhouse
C++
ClickHouse is a free analytic DBMS for big data.
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- Issues
- ReplicatedMergeTree replica template is hardcoding database and table names after upgrade from 20.7.2.30 to 21.1.2
- ssl_cert, ssl_key, ssl_ca options for MYSQL engine is not documented
- Bitmap querying optimization
- [RFC] Limited support for transactions in MergeTree tables
- Finalize aggregations at field boundaries by taking advantages of ordering
- Upload Logs that Fail to Parse as a String in a Specified Table
- windowFunnel: same event gets counted twice
- FlatDictionary decrease memory consumption
- optimize_read_in_order does not work with ORDER BY OFFSET, LIMIT when the offset is greater than 1400.
- Indentical subqueries (or CTE) execute only once. (condition pushdown)
- Docs
- C++ not yet supported