clickhouse
https://github.com/yandex/clickhouse
C++
ClickHouse is a free analytic DBMS for big data.
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- Issues
- Quotas KEYED BY ip_address bill INSERT written_bytes to a shared 0.0.0.0 bucket: cross-client QUOTA_EXCEEDED and dropped acknowledged async inserts (regression in 25.5)
- Correlated scalar subquery without GROUP BY spuriously hits max_rows_to_group_by: TOO_MANY_ROWS with default throw mode, silent wrong counts with break
- JSON: merges with `advanced` shared-data serialization hash every shared-data path once per bucket
- JSON: parsing text into the `JSON` type hashes each leaf path up to 3 times per row to find its typed or dynamic column
- JSON type rejects unpaired UTF-16 surrogate escapes (`"\udf1e"`), and `input_format_json_throw_on_bad_escape_sequence = 0` does not apply to it
- Expose Prometheus-compliant `_total` counter names for ProfileEvents (opt-in)
- Iceberg `OPTIMIZE TABLE` rewrites the table instead of committing a snapshot: a second OPTIMIZE leaves no metadata file
- `LogSource` re-reads a `LowCardinality` prefix for its subcolumn, hits EOF
- Do not count `DROP` records toward the `MergeTreeDeduplicationLog` window
- Keep the type of a nested value inserted into a `Variant` with `INSERT ... VALUES`
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