clickhouse
https://github.com/yandex/clickhouse
C++
ClickHouse is a free analytic DBMS for big data.
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- Issues
- Puffin output format
- Reduce the work per granule and per row for `JSON` typed paths and shared data
- Restore the order of `LowCardinality` columns of `Map` buckets with one permutation
- Analyzer: ASSUME constraint on a Map subscript never fires, because FunctionToSubcolumnsPass rewrites `m['k']` to `m.key_k` first
- Compare effective sorting key when adopting parts from another table
- MergeTree projection returns wrong rows for _part_offset filter after reordering
- async_insert is ignored for INSERT queries executed through gRPC
- FR: Commit an app-supplied DDL tag value atomically alongside a DDL operation
- Distributed table async-insert queue files written by 26.8.9 are unreadable by 26.7.4
- LOGICAL_ERROR / abort: a v2 patch part plus a pending `ALTER MODIFY COLUMN` read by a sorting key column's `DEFAULT` aborts both `SELECT` and the materializing mutation
- Docs
- C++ not yet supported