clickhouse
https://github.com/yandex/clickhouse
C++
ClickHouse is a free analytic DBMS for big data.
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- Issues
- Do not build the conditions of minmax skip indexes the filter cannot use
- Parquet and Iceberg reads run JOIN runtime filters after weak PREWHERE conditions; running the more selective one first makes TPC-DS q37 and q82 2.1-2.3x faster
- Iceberg: struct subcolumn `st.x` fails with `NOT_FOUND_COLUMN_IN_BLOCK` on data files written before any schema change
- Bump `StringZilla` from v5.0.5 to v5.3.2
- Show hardware counters for changed queries in the perf report
- Show the thread stack alignment of both servers in the perf report
- Fix `round`, `floor`, `ceil` and `trunc` of floats returning `inf` on overflow or a wrong value for `|N| >= 20`
- Fix Parquet reads of subcolumns like `n.null` when PREWHERE consumes their column
- enable `query_masking_rules` in DDL statements
- Parquet: empty data pages that Arrow C++ writes in repeated columns fail with `Invalid offset index` or `ATTEMPT_TO_READ_AFTER_EOF`, and `datapage_v2_empty_datapage.snappy.parquet` fails with `CANNOT_DECOMPRESS`
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- C++ not yet supported