clickhouse
https://github.com/yandex/clickhouse
C++
ClickHouse is a free analytic DBMS for big data.
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- Issues
- A replica queues and executes the GET_PART entries of its own inserts through the fetches pool
- Allow altering index_granularity and index_granularity_bytes on non-replicated MergeTree
- windowFunnel with 'strict_deduplication', 'strict_once' returns different results for the same rows in a different order
- windowFunnel 'strict_once': memory grows factorially with rows at the same timestamp (10 rows use ~1.9 GB)
- Refreshable materialized views with a live FINAL tail (deduplicated rollups over ReplacingMergeTree)
- Single writer, many readers: what keeps a reader safe from outdated-part removal?
- Expose SimpleMergeSelector's fixed per-part cost (size_fixed_cost_to_add) as a MergeTree setting
- Run apk upgrade in alpine Docker images so base packages get security fixes
- `Merge` + `ORDER BY`: expression on remote child's missing column default-filled
- Legacy `ANY INNER JOIN` wrongly treated as `SEMI JOIN`, hides right-side columns
- Docs
- C++ not yet supported