clickhouse
https://github.com/yandex/clickhouse
C++
ClickHouse is a free analytic DBMS for big data.
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- Issues
- The VALUES format in INSERT query does not parse C-style comments
- Optimization: push down filter from join via subquery that returns join key
- Fix EXPLAIN indexes =1 for tuple IN (set)
- clickhouse-client: replxx: history file: broken query order
- XML/HTML/XPath functions
- clickhouse-format: add a CLI flag to hide secrets, and hide secrets by default
- Pre-aggregate table grouping by join key before performing join
- Join in ALTER UPDATE
- `grpc` prints trash to stderr in `clickhouse-client` causing random tests failures
- Move INNER JOIN conditions that depend only right table from WHERE to ON stage
- Docs
- C++ not yet supported