clickhouse
https://github.com/yandex/clickhouse
C++
ClickHouse is a free analytic DBMS for big data.
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- Issues
- `COLUMNS('feature')` alias `* ILIKE 'feature%'` (compatibility with SnowFlake)
- `file`-like table functions and engines to take Array argument
- AzureBlobStorage access by SPN (Service Principal Name)
- Convert invalid date string to date by `toDateOrNull` doesn't return null
- Some merges may still stuck?
- Should merge join change to TemporaryDataOnDisk?
- Fix bug in MergeJoin with low cardinality in using
- Missing columns on: INSERT INTO ... SELECT c1 FROM file('test.parquet') WHERE c2>0
- alternative GroupArray aggregation function which consumes less memory by using singly linked table
- "Select * order by {primary key} limit {n}" reads lots of data and consumes a lot of memory
- Docs
- C++ not yet supported