clickhouse
https://github.com/yandex/clickhouse
C++
ClickHouse is a free analytic DBMS for big data.
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- Issues
- transform keys the mapping table on raw float bits: -0.0 misses the entry for 0
- Bare dictionary name + ON CLUSTER hits mixed-default-DB guard: NOT_IMPLEMENTED
- Collapsing merge changes `sum(sign)`: level>0 part's key pair never re-collapsed
- Manifest-vs-manifest schema conflict throws before metadata.json is registered
- Sort order is not propagated when we use optimize_aggregation_in_order
- JSON type: an integer inside an array is silently rounded to a double (2⁵³+1 → 2⁵³, `Int64` max → 9223372036854776000) when an earlier row in the same block had a float array on that path
- `DateTime` under `Variant` still crosses as text: wrong instant on shard
- Arrow readers ignore the clickhouse.opaque tag when deriving a type from the schema
- Arrow Flight cannot read a Variant back: the Arrow-library reader has no union support
- Re-implement #117803
- Docs
- C++ not yet supported