clickhouse
https://github.com/yandex/clickhouse
C++
ClickHouse is a free analytic DBMS for big data.
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- Issues
- Vertical merge applies rows TTL despite STOP TTL MERGES: LOGICAL_ERROR
- `CAST(((1)) AS Nullable(UInt128))` returns NULL: nested parens read as a tuple
- CAST literal: NULL admitted by a Nullable below it, silently read as a default
- 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
- Docs
- C++ not yet supported