clickhouse
https://github.com/yandex/clickhouse
C++
ClickHouse is a free analytic DBMS for big data.
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- Issues
- `FileLog`: a direct `SELECT` that fails to parse a record loses that record
- Keep the buckets of timeSeries*ToGrid states in a plain array when they are dense
- High constant overhead per block: 13-27 µs per block makes blocks smaller than ~8K rows inefficient (ClickBench with small max_block_size)
- Advise the whole cold Parquet byte range to the kernel before reading a local file with pread
- S3 engine glob listing path intermittently sends unsigned ListObjects when table uses extra_credentials(role_arn=...)
- Optimize Q7 from ClickBench for datalakes
- Chain read-pool range refiners instead of installing one
- DO NOT MERGE: run 20 copies of Fast test (arm_darwin) to collect orphan reports
- Apply optimize_functions_to_subcolumns to FINAL queries on ReplacingMergeTree
- Parse the first parallel parsing unit in the reading thread, so a small input starts no threads
- Docs
- C++ not yet supported