clickhouse
https://github.com/yandex/clickhouse
C++
ClickHouse is a free analytic DBMS for big data.
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- Issues
- INSERT with use_legacy_to_time = 1 writes legacy toTime values into a Time key: wrong results, LOGICAL_ERROR in debug builds
- `distinctJSONPaths(j) OVER (...)` drops its window: one row, wrong paths
- CSV first field loses leading whitespace with variable column count enabled
- `APPLY(arrayJoin)` slips past projection check: inserts hit `LOGICAL_ERROR`
- `IN (subquery)` set building is single-threaded: several times slower than the equivalent `LEFT SEMI JOIN` for large sets
- 26.3: S3 table with `role_arn` spends ~77 s in STS retries on CREATE and at every server start
- clickhouse local aborts (SIGABRT) when a `??` AI reply contains a tab
- Memory allocation issues when performing INSERT SELECT of a Map(String, String) column with large values
- Plan-time constant folding of unbounded generator functions (arrayWithConstant, arrayResize, replicate) ignores max_execution_time/max_memory_usage
- Compare only the dictionary in `ColumnLowCardinality::dynamicStructureEquals`
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