clickhouse
https://github.com/yandex/clickhouse
C++
ClickHouse is a free analytic DBMS for big data.
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- Issues
- 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
- Allow Identifier query parameters to name a parameterized view
- Text index is not used for SIMILAR TO predicates (follow-up to #101514)
- File and URL reads return columns that only PREWHERE uses; dropping them makes ClickBench q31/q32 on Parquet 5-7% faster
- Docs
- C++ not yet supported