clickhouse
https://github.com/yandex/clickhouse
C++
ClickHouse is a free analytic DBMS for big data.
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- Issues
- Speed up the analyzer / planner for SELECT count() and similar lightweight queries
- Add a new system table `user_query_log`
- Add SQLite input/output format
- `getMinMaxCountProjection` incorrectly returns swapped min/max when explicit PRIMARY KEY is used with DESC ORDER BY
- Tables with positional-argument projections cannot be attached when `enable_positional_arguments_for_projections=false` because ATTACH uses global context, ignoring session settings
- Missing space in `BAD_ARGUMENTS` error message for duplicate PASTE JOIN columns
- VALUES clause silently produces empty Map when inserting `Map(Float64, V)` into `Map(Float32, V)` column
- Tab width calculation ignores `output_format_pretty_row_numbers` setting, causing incorrect column widths
- STDOUT compression not applied when output format is explicitly specified
- Logical error: 'std::exception. Code: 1001, type: std::out_of_range, e.what() = unordered_map::at: key not found (version 26.5.1.465), Stack trace: (STID: 2508-34fb)
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