clickhouse
https://github.com/yandex/clickhouse
C++
ClickHouse is a free analytic DBMS for big data.
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- Issues
- Record TopK PREWHERE granule skips in the query condition cache
- divide accumulates into Int256 that wraps for divisors above 2^255/10
- `Buffer` table with unflushed rows throws 49 LOGICAL_ERROR "Column or subcolumn 'vec.quantized' not found in Buffer table" when a `Quantized` codec subcolumn is read
- On-fly UPDATE writes only the parent column; disk-stored subcolumns stay stale
- Report an integer operand that does not fit the decimal result width
- Fix(Array): Nullable String needles in array membership functions
- Projection reads fail with exception 4 `primary.cidx is unexpectedly long` (or 33 `Cannot read all data`) while an `ALTER MODIFY COLUMN` of the projection's sorting-key column is pending on a previously mutated part
- Allow attach as replicated for Ordinary databases
- DeltaLake: a `WHERE` on a column whose name contains a dot fails with `DELTA_KERNEL_ERROR` (`Predicate references unknown column`) while selecting it works — the engine predicate passes the raw name and the kernel splits it on dots
- DeltaLake: reading any struct subcolumn (`nest.r`, `tupleElement`) from a partitioned table fails with `UNKNOWN_IDENTIFIER` — the per-file partition transform is pruned with subcolumn names it never outputs; unpartitioned tables and the pre-kernel reader work
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- C++ not yet supported