clickhouse
https://github.com/yandex/clickhouse
C++
ClickHouse is a free analytic DBMS for big data.
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- Issues
- timeout_overflow_mode='break' over HTTP yields zero stats / empty Parquet body
- Server fails to start with `<comment>` in dictionary/UDF config.d files
- Progress bar not cleared before rows when stderr shares stdout (`2>&1`)
- TopN Parquet read caches a reduced row count; later `count()` is wrong
- Subcolumn of Hive partition column read from file instead of path
- Apply `session_timezone` to string literals inside functions in mutations
- Failed REPLACE PARTITION leaves old and new rows both active in MergeTree
- `bloom_filter` index on float column skips granules holding `-0.0` vs `0.0`
- NULL in a `Variant` column wrongly fails `IN set` under transform_null_in
- Positional WITH FILL key checked against INTERPOLATE under wrong column name
- Docs
- C++ not yet supported