clickhouse
https://github.com/yandex/clickhouse
C++
ClickHouse is a free analytic DBMS for big data.
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- Issues
- Background prewarm of the filesystem cache for a server that starts with an empty cache
- Backport #117754 to 26.8: Split an oversized chunk across several Arrow record batches
- DEFAULT of a column added by ALTER is evaluated in the global context for rows written before the ALTER (MergeTree, Memory)
- Iceberg: use the NDV of table statistics (`apache-datasketches-theta-v1`) in join and aggregation estimates
- Cherry pick #125801 to 26.8: Parallel replicas followers follow the initiator whatever their own `automatic_parallel_replicas_mode`
- Cherry pick #125801 to 26.9: Parallel replicas followers follow the initiator whatever their own `automatic_parallel_replicas_mode`
- Use the background context for `ReplicatedMergeTree` merges
- Plan-based parallel replicas: `IN` set backed by a temporary table is shipped to the replicas
- Faster conversion of `Float32` and `Float64` to 128- and 256-bit integers and decimals
- Convert large floating-point values to 128- and 256-bit integers exactly
- Docs
- C++ not yet supported