clickhouse
https://github.com/yandex/clickhouse
C++
ClickHouse is a free analytic DBMS for big data.
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- Issues
- Perf(MergeTree): Reuse KeyCondition range-check scratch during index pruning
- Perf(Parquet): Speed up array offset reconstruction
- Perf(Array): Skip arrayFilter materialization for uniform filters
- Keep the part sorted when TTL GROUP BY ... SET rewrites a sorting key column
- Use the vertical merge algorithm for TTL DELETE on Replacing and Collapsing tables
- Fix `Not-ready Set` logical error from an `IN` subquery inside a `map*` or `arrayFold` lambda
- A self-join on a rank offset is a neighbour lookup: answering it with lagInFrame/leadInFrame is 66% faster on TPC-DS query 47 and query 57
- Do not flatten JSON arrayElement chains across typed path prefixes
- Compute the day of week and the time of day arithmetically
- Fix reading one element past the end of the parsed sequenceMatch pattern
- Docs
- C++ not yet supported