clickhouse
https://github.com/yandex/clickhouse
C++
ClickHouse is a free analytic DBMS for big data.
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- Issues
- S3Queue: swallowed `after_processing='delete'` failure silently re-ingests files as duplicates
- Join order optimization at default settings builds the hash table from a ~320x-underestimated join intermediate: 64x read amplification on duplicated keys (identical results)
- Refuse Iceberg data compaction until it can publish its result
- Function `resetSerialID` to reset/remove a `generateSerialID` series
- Fix an error reading an Iceberg table whose `current-snapshot-id` is JSON null
- Iceberg: reading BigQuery-written v2 manifests fails on missing snapshot_id (ICEBERG_SPECIFICATION_VIOLATION), same class as the fixed sequence_number issue
- Lazy Materialization for Joins
- GROUP BY / SELECT alias colliding with subquery column name causes false Code: 215 (NOT_AN_AGGREGATE)
- CODEC(Default) on a column ignores the column's type when resolving the table's default codec, silently degrading type-aware codecs
- Apply optimize_functions_to_subcolumns in WHERE/PREWHERE on shards of distributed queries
- Docs
- C++ not yet supported