clickhouse
https://github.com/yandex/clickhouse
C++
ClickHouse is a free analytic DBMS for big data.
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- Issues
- 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
- SequenceMatch doesn't support DateTime64(6) type fields
- Support declared value for Nullable storage, avoiding separate bitmap performance impact
- multi thread write same batch data to clickhouse ReplicatedMergeTree, will data duplicate?
- Bitmap can only support Int. When can they be extended to UUID?
- Docs
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