clickhouse
https://github.com/yandex/clickhouse
C++
ClickHouse is a free analytic DBMS for big data.
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- Issues
- `SYSTEM START VIEW` through an alias does not resume a refreshable materialized view
- Distribution queue grow and BackgroundDistributedSchedulePoolTask stuck
- Add `cast_to` parameter to `estimateCompressionRatio`
- Resolve the 26.8 cherry-pick conflicts of #116723
- Text index: a search that also selects a wide non-indexed column reads it for every row of every selected granule; filtering in the read step cuts 607 ms to 85 ms
- Open a skip index's substream files only when they are read
- Split AggregateFunctionTimeseriesHelpers.cpp: its object is at 93% of the 50 MB large-object gate on master, and over it with PromQL range functions
- Fix access checks in PREWHERE and indexHint() that used aliases
- Let a text index reader serve incomplete granules
- DeltaLake writes: decimal partition value committed without scale (`1.5` for `decimal(10,2)`), the table is then unreadable by ClickHouse and delta-rs
- Docs
- C++ not yet supported