clickhouse
https://github.com/yandex/clickhouse
C++
ClickHouse is a free analytic DBMS for big data.
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- Issues
- Experimental catalog_type='jdbc': read Iceberg JdbcCatalog directly from Postgres
- Can't unwrap a UDF result into columns when the number of columns varies by row
- Pending CLEAR COLUMN IN PARTITION is applied at read time to parts of all partitions on non-replicated MergeTree
- Fix one-minute shutdown delay after writing an access entity to disk
- Mixed conditions with partial merge
- ORDER BY with two WITH FILL keys and NULLS FIRST: generated rows precede the NULL row, a fill row is emitted twice, and DISTINCT returns duplicates at default settings
- Parquet statistics pruning silently drops NaN rows: min/max stats exclude NaN by spec but predicates matching NaN are pruned against them
- Iceberg min-max pruning silently drops NaN rows: nan_value_counts is never read, and a NaN bound endpoint defeats the inverted-bounds untrustworthiness check
- `TYPE_MISMATCH` counted in `system.errors` during key condition analysis (regression in 26.7.1)
- Memory limits are silently ignored for allocations made via `operator new`: `max_memory_usage` exceeded 54x, and the server can be OOM-killed under `max_server_memory_usage`
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- C++ not yet supported