clickhouse
https://github.com/yandex/clickhouse
C++
ClickHouse is a free analytic DBMS for big data.
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- Issues
- Add IColumn::updateHashWithValueCanonical for compareAt-compatible hashing
- ALTER MODIFY COLUMN after a lightweight DELETE fails when soft-deleted rows hold unconvertible values
- Fix NormalizeQuery dropping unary +/- before non-literal tokens after…
- RFC: Reduce per-block IColumn allocation overhead during Shuffle with `computeHashInto` + `scatter_into`
- clickhouse-test: reset enabled failpoints after no-parallel tests
- Fix transient Azure errors misreported as broken data parts
- Refreshable MV target tables keep stale inactive parts between refreshes and repeatedly abort background merges
- Logic error: INNER JOIN ON predicate is not equivalent to CROSS JOIN with WHERE
- Enable unsigned integer overflow checks in undefined behavior sanitizer
- Logic error: INNER JOIN is not commutative under equivalent predicates (JOIN reordering breaks result)
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- C++ not yet supported