clickhouse
https://github.com/yandex/clickhouse
C++
ClickHouse is a free analytic DBMS for big data.
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- Issues
- Support two-step schema propagation for Distributed tables during column metadata ALTER
- Add two-step column metadata propagation for `Distributed` table `ALTER`
- CSV FORMAT: DateTime64 parser consumes Bool column value when epoch has fewer than 3 decimal digits
- Unexpected behaviour in Dictionary incremental refresh: watermark logic ignores UPDATE_FIELD and INVALIDATE_QUERY does not suppress empty loads
- How to resolve persistent error when querying `system.columns`: File store/../some_name.bin is not added to the file checker: While executing Columns.
- Fix wrong shared library symbol resolution in stack traces
- Split `parallel_replicas_parallel_distributed_insert_select` from `parallel_distributed_insert_select`
- PR fix in getMonotonicityForRange is bypassed by single_point=true in partition pruner, leaving division-by-zero unfixed for queries without companion x!=0 filter
- max_key_range=65536 too restrictive: legitimate DDSketch queries fail with INCORRECT_DATA
- Include `rows_before_limit_at_least` in `X-ClickHouse-Summary` header
- Docs
- C++ not yet supported