clickhouse
https://github.com/yandex/clickhouse
C++
ClickHouse is a free analytic DBMS for big data.
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- Issues
- Logical error: 'Unexpected return type from globalIn. Expected Nullable(UInt8). Got UInt8' in sample-block planning for a Distributed table
- Release the server status file lock when a graceful stop fails, so system tables can still be dumped
- Add coverage tests for six untested function branches
- IN with mismatched column count under `transform_null_in = 0` is only rejected at execution time: `use_skip_indexes` / index pruning / an empty table flip the query between error 20 and a silent result
- `insertBatchAtomic` discards a whole patch entry when any conflicting entry is newer, so the entry never erases the older conflicting entries it replaces — `mergedJSONPatch` returns different results for the same rows depending on arrival order
- optimize_inverse_dictionary_lookup does not work with views
- Drop lldb's loader rendezvous breakpoint before collecting stacktraces
- date_time_overflow_behavior is ignored when reading out-of-range Date32 values via IcebergS3 table engine (works with icebergS3() table function)
- Fix undercounted files_read/bytes_read after a concurrent RESTORE
- New (performance.ci.clickhouse.com) dashboard is kinda silly in which metrics it highlight
- Docs
- C++ not yet supported