clickhouse
https://github.com/yandex/clickhouse
C++
ClickHouse is a free analytic DBMS for big data.
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- Issues
- `LogSource` re-reads a `LowCardinality` prefix for its subcolumn, hits EOF
- Do not count `DROP` records toward the `MergeTreeDeduplicationLog` window
- Keep the type of a nested value inserted into a `Variant` with `INSERT ... VALUES`
- Add settings to choose the profiling collected for logged query plans
- Add `system.table_settings`
- Fix CSV parallel parsing segmenter: open a quote only at field start
- Parallel replicas: tests failing in the `ParallelReplicas` configuration (umbrella)
- Record the sub-plans of subqueries in the logged query plan
- `TSVRaw` ignores `input_format_tsv_crlf_end_of_line`, keeps `\r` in last field
- TSV input into `Dynamic`/`Variant` unescapes twice and corrupts strings
- Docs
- C++ not yet supported