clickhouse
https://github.com/yandex/clickhouse
C++
ClickHouse is a free analytic DBMS for big data.
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- Issues
- Keep the partition spec when Iceberg `OPTIMIZE TABLE` rewrites a partitioned table
- Cherry pick #124553 to 26.3: Group PREWHERE read steps by exact columns and rewrite `m['key']` to a key subcolumn only for bucketed `Map`
- Cherry pick #124553 to 26.8: Group PREWHERE read steps by exact columns and rewrite `m['key']` to a key subcolumn only for bucketed `Map`
- Cherry pick #124553 to 26.9: Group PREWHERE read steps by exact columns and rewrite `m['key']` to a key subcolumn only for bucketed `Map`
- Keep sparse columns when an async `INSERT ... SELECT` falls back to a synchronous insert
- Count references in the tupleElement default when pruning ARRAY JOIN columns
- Avoid duplicate column names when lifting ARRAY JOIN up
- Keep a constant filter after a partial filter push-down
- toDecimalString(Decimal, 0) leaves a trailing decimal point when the scale is above 0
- Write no decimal point in toDecimalString with zero precision
- Docs
- C++ not yet supported