clickhouse
https://github.com/yandex/clickhouse
C++
ClickHouse is a free analytic DBMS for big data.
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- Issues
- Text index: a large part's LIKE dictionary scan runs on one reading thread while the query's other threads wait; letting them help while no other query runs cuts query time 56-59%
- Test build
- CSV parsing scales badly with input_format_csv_missing_nullable_as_empty_string
- Wrong result: an alias-keyed `additional_table_filters` entry is dropped for cluster table functions (`urlCluster`, `s3Cluster`)
- Glue/HMS DataLakeCatalog serves stale cached table after external drop+recreate
- Split long PromQL range queries by interval and cache completed chunks
- Fix a `JSONAllValues` text index skipping matching rows of `Dynamic` and `Variant` JSON paths
- Text index: intersect posting lists once per 65536 rows instead of once per granule in materialize mode
- Do not take a data snapshot of the source table for materialized view inserts
- Reject storage policies whose disks share the same storage namespace
- Docs
- C++ not yet supported