clickhouse
https://github.com/yandex/clickhouse
C++
ClickHouse is a free analytic DBMS for big data.
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- Issues
- Wrong `shardNum()` with `serialize_query_plan = 1` and `make_distributed_plan = 1`
- Fix Parquet pruning dropping NULL rows that `ifNull`, `coalesce` or a `transform_null_in` set matches
- Iceberg/Delta LIMIT query over remote fails max_rows_to_read falsely
- icebergTruncate cuts Iceberg binary by UTF-8 code points, pruning drops rows
- Iceberg filter on a reused column name prunes old files by wrong column
- Always back-quote the table of a path PUT upload so a table named `function` works
- Text index misreads vectorscan `(?#…)`, `(?x:…)`: `multiMatchAny` drops rows
- Further improvements to hex/unhex
- `LowCardinality(String) = ''` rewrite to `empty()` breaks shard pruning
- Add immutable setting for MergeTree tables
- Docs
- C++ not yet supported