clickhouse
https://github.com/yandex/clickhouse
C++
ClickHouse is a free analytic DBMS for big data.
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- Issues
- 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
- `minmax` index and Parquet stats prune NaN rows under a negated predicate
- Lightweight UPDATE/DELETE on a table with a `_part` column: ILLEGAL_COLUMN
- `ALTER UPDATE/DELETE` on a column shadowing `_part`: NOT_FOUND_COLUMN_IN_BLOCK
- Empty `\Q\E` absorbs a quantifier: `replaceRegexpAll` still becomes `...One`
- formatQuery/parseQueryToJSON/formatQueryFromJSON fail on LowCardinality(String)
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- C++ not yet supported