clickhouse
https://github.com/yandex/clickhouse
C++
ClickHouse is a free analytic DBMS for big data.
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- Issues
- BACKUP to S3 Express fails with InvalidPart: CompleteMultipartUpload omits the per-part checksums that checksummed multipart uploads require
- ASOF JOIN returns a different tied row depending on join_algorithm and on the number of rows on the right side
- Add a preliminary DISTINCT to UNION DISTINCT
- Perf: optimize PromQL dropMetricName for fixed metric names
- Paimon REST catalog: paginated listings never terminate — a stale nextPageToken re-requests the last page forever
- ARRAY JOIN + WHERE on the joined column over a Merge table wrapping a Distributed table throws NOT_FOUND_COLUMN_IN_BLOCK for __array_join_exp_1
- Backport #112329 to 25.8: Enforce parent table row policy in mergeTreeProjection table function
- Compress the symbol table in release binaries: `.gnu_debugdata` for external tools + a compact `.clickhouse.symbols` section for self-symbolization
- Do not admit non-clonable read steps into the MergeTree direct join
- The `_database` and `_table` virtual columns of a `Merge` table carry the matched child's name again
- Docs
- C++ not yet supported