clickhouse
https://github.com/yandex/clickhouse
C++
ClickHouse is a free analytic DBMS for big data.
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- Issues
- Read the lazily materialized columns of object storage files in parallel
- Keep the alias of a subcolumn when recomputing a MATERIALIZED column
- Support SQL NULL semantics for scalar `IN`
- Add a `disabled` attribute to performance test queries, and disable five verbatim duplicates
- Push subcolumn reads down the query plan to the MergeTree read step
- Add `UnhashedPackedStringRef`, a `PackedStringRef` without a hash
- Fix the crash of `merge`, `loop` and `executable` reading a materialized view's source table on INSERT
- Do not list every key node when dropping a `KeeperMap` table
- Clear libfiu's fast-path flag when the last fail point is disabled
- Preserve exact numeric membership in row-wise `IN` lists
- Docs
- C++ not yet supported