clickhouse
https://github.com/yandex/clickhouse
C++
ClickHouse is a free analytic DBMS for big data.
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- Issues
- Make relation statistics traversal iterative
- DeltaLake writes: a 0-row INSERT commits an empty version on an unpartitioned table but nothing on a partitioned one
- DeltaLake writes: INSERT into a Unity Catalog managed table is refused only by the storage (`S3_ERROR`/AccessDenied) instead of an explicit rejection
- Count one statement as one query in a table's max_concurrent_queries limit
- Do not commit an empty Delta Lake version when an INSERT writes no data file
- Recognise an `arrayJoin` hidden in an `APPLY` column transformer
- GLOBAL IN subquery in PREWHERE on a Distributed table is executed twice with the analyzer
- Bloom/text skip index copies every column name per query: +20% on wide tables
- Let a comment command in the same ALTER see the columns MODIFY QUERY introduces
- ACCESS_DENIED (Code 497) with column-level grants under default optimize_empty_string_comparisons and optimize_functions_to_subcolumns on 26.6
- Docs
- C++ not yet supported