clickhouse
https://github.com/yandex/clickhouse
C++
ClickHouse is a free analytic DBMS for big data.
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- Issues
- FLBA read as String: stats/bloom keep padded bytes, trimmed value unfindable
- Support EXCHANGE DATABASES db1 AND db2 for atomic swap of entire databases
- `groupArraySampleTuple` via `-Tuple` reported deterministic, corrupts MergeTree
- `topK` + 9 more: Decimal parameter makes the persisted column type unloadable
- Feat(MergeTree): Allow `MergeTree` key columns to widen integer types
- `arrayShuffle` seeded shuffle result depends on `max_block_size` — deterministic-given-seed contract violated
- `LEFT JOIN` / `SEMI LEFT JOIN` with non-equi `ON` accepted only when `query_plan_split_filter = 1` — optimization flip changes acceptance predicate
- `clickhouse local` accepts `--logger.level` but always logs at `trace` to the console — user-supplied level is overwritten with `trace`
- `Field::restoreFromDump` cannot read the `UUID_` / `IPv4_` / `IPv6_` dumps that `Field::dump` writes — non-basic `Literal` values not JSON-round-trippable + garbage leaks `CANNOT_PARSE_QUOTED_STRING`
- Analyzer's `tryReplaceOrEqualsChainWithIn` moves the `IN` behind other operands — defeats short-circuit guards under default settings (`x = 0 OR intDiv(1, x) != 0 OR x = 2 OR x = 3` → `Division by zero`)
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