clickhouse
https://github.com/yandex/clickhouse
C++
ClickHouse is a free analytic DBMS for big data.
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- Issues
- Add test: `active_on_fly_alter_mutations` counter for `READ_COLUMN`/`ALTER MODIFY COLUMN` type-change is untested
- Add test: Specialized `insertManyFrom` for `ColumnFixedString`/`ColumnDecimal`/`ColumnNullable`/`ColumnTuple`/`ColumnMap` not exercised by any `arrayShift*` test
- Add per-object trace logs to object storage cluster sources
- Add test: Short-circuit `filter`/`execute`/`expand` branch in `IExecutableFunction::defaultImplementationForNulls` has zero deterministic stateless coverage
- Add test: `FunctionWithOptionalConstArg::getMonotonicityForRange` DateTime64-with-timezone branch in `KeyCondition.cpp` is untested
- Add test: New `HASHED_ARRAY` rejection of `SHARDS > 1` + `UPDATE_FIELD` is untested
- Add test: `ColumnIPv6` per-row indexing in `FunctionStringHashFixedString` only tested with identical values across rows
- CI: re-enable automerge for backport branches workflow
- Add test: `validate_experimental_and_suspicious_types_inside_nested_types = 0` bypass branch in `validateDataType` has no behavioural test
- Backport #103858 to 26.2: Fix data part check and consistency check for tables with JSON column
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