clickhouse
https://github.com/yandex/clickhouse
C++
ClickHouse is a free analytic DBMS for big data.
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- Issues
- Do not use Parquet bloom and dictionary filters for an `IN` set holding NULL
- Parquet `ORDER BY <String> LIMIT`: values beyond the top-K threshold are copied and then discarded by the sort; skipping the copy makes ClickBench Q26 over the 100 partitioned files 12% faster on top of #128290
- 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
- PUT upload INSERT fails with SYNTAX_ERROR for table or database named `function`
- Always back-quote the table of a path PUT upload so a table named `function` works
- Text index misreads vectorscan `(?#…)`, `(?x:…)`: `multiMatchAny` drops rows
- Docs
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