clickhouse
https://github.com/yandex/clickhouse
C++
ClickHouse is a free analytic DBMS for big data.
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- Issues
- Can we check for existing tables in atomic database when adding a new replica to cluster and creating a schema there?
- bfloat16 histogram state merging is slow when compared with tdigest
- AggregateFunction column in external table didn't work
- AST is too big error on query with a lot of inner subqueries
- executable engine - respect limit
- A way to drop cache of formats (/var/lib/clickhouse/format_schemas/)
- StringHashTable::dispatch masking optimization
- Range extension for type Date32
- virtual column _row_number, _error, _raw_value for file, s3, hdfs functions.
- access denied on column level when upgrade to 21.9
- Docs
- C++ not yet supported