clickhouse
https://github.com/yandex/clickhouse
C++
ClickHouse is a free analytic DBMS for big data.
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- Issues
- Detect a recreated table in the stateful cache of Glue and Hive DataLakeCatalog databases
- Do not estimate a filtered join input from statistics of columns its filter does not read
- `optimize_row_order = 1`: INSERT fails with NOT_IMPLEMENTED for a `Nullable(Tuple)` or `Nullable(JSON)` column
- USING join key ignores alias precedence when alias equals other table's name
- Memory PREWHERE with `_table`/`_database` selected throws THERE_IS_NO_COLUMN
- CI: when several jobs of a PR run lose their runner, only some are re-run
- Merge over Distributed child returns cast parent instead of subcolumn value
- Already-expired newer ReplacingMergeTree version is removed by a single-part TTLDropMerge and the older row remains
- `rewrite_in` prunes another table's `IN`: distributed table matched by alias
- `rewrite_in` mutates an `IN` node that `WHERE` shares with `GROUP BY`
- Docs
- C++ not yet supported