clickhouse
https://github.com/yandex/clickhouse
C++
ClickHouse is a free analytic DBMS for big data.
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- Issues
- Materialized column with sipHash64 have unexpected value
- ORDER BY WITH FILL on distributed table gives duplicate timestamps
- Cached range_hashed dictionary layout
- DateTime64 support in range_hashed dictionary layout
- Add option to write progress to file without escape codes etc
- Aggregate function states versioning problems
- JOIN from MergeTree table has lower parallelism than from numbers_mt
- Optimize reading from table functions `file/s3/...` with numeric ranges in globs
- Schema inference for freeform text formats
- Large number of `close` syscalls when using table function `file` with large number of files.
- Docs
- C++ not yet supported