clickhouse
https://github.com/yandex/clickhouse
C++
ClickHouse is a free analytic DBMS for big data.
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- Issues
- Analyzer: NOT_AN_AGGREGATE for alias column usage
- uniqTheta: 5-byte state blob allocates 1 GiB, unrefused by max_memory_usage
- Stress test `Hung check` fails without finding a hung query: the check's own `system.stack_trace` query queues behind another reader of it
- LIMIT BY keys_to_keep set compares aliases, so an aliased GROUP BY key is missed
- Keep a function of an ORDER BY column in the sort key under CUBE, ROLLUP and GROUPING SETS
- Skip Hive hidden paths (_temporary/, .spark-staging-*/) when listing object storage files by glob
- Add hive_partition_strategy_strict_read_glob: build the hive partition strategy read glob from the partition columns
- Performance Comparison: order_by_read_in_order #1 is the top source of "slower" verdicts, and none of them are regressions
- Add with_key_columns serialization for Map
- minmax skip index wrongly prunes rows with NaN in Map columns
- Docs
- C++ not yet supported