clickhouse
https://github.com/yandex/clickhouse
C++
ClickHouse is a free analytic DBMS for big data.
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- Issues
- Do not claim `toString` injective for `Bool`
- `null_as_default` in existing-variant pass turns `[null]` into `[[]]` or `[{}]`
- Existing Tuple variant truncates or pads arrays of a different length
- JSON Dynamic strings get silently parsed into existing Date/DateTime variants
- system.stack_trace query stops at first thread_id block with no match
- Reading valid Arrow structs with bad field names pollutes system.errors
- Empty INSERT into .lz4 file corrupts later reads (LZ4_DECODER_FAILED)
- Truncated .zst/.lz4 input reads back as complete file, no error
- Bucket-split cluster read drops Iceberg deletes, now reachable for tables
- `input` inside `RETURNING` gives `LOGICAL_ERROR` 'Input initializer is not set'
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- C++ not yet supported