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Apache Arrow
Apache Arrow is a multi-language toolbox for accelerated data interchange and in-memory processing
Another "database toolkit" project that I've recently learned about is Apache DataFusion, also written in rust and uses Arrow memory format:
https://github.com/apache/arrow-datafusion/blob/master/READM...
Just another embedded SQL engine.
There are SQLite(OLTP), DuckDB(OLAP) and some engine-based project like mentioned Apache Arrow(https://arrow.apache.org/)(OLAP): Apache Arrow has many language implementations, some do not include the query engine(for example, Rust implementation, which depends on the DataFusion for more SQL-like analytics) in its own repo, but other do include(for example, C++).
There is a comprehensive benchmark by ClickHouse for OLAP but including kinds of embedding engines: https://benchmark.clickhouse.com/
The more interesting is that, in fact, we have not an embedded HTAP engine. One of my database products already implements 3/4 HTAP at the engine layer, but unfortunately it's still just a free software, not an open source implementation.
Just another embedded SQL engine.
There are SQLite(OLTP), DuckDB(OLAP) and some engine-based project like mentioned Apache Arrow(https://arrow.apache.org/)(OLAP): Apache Arrow has many language implementations, some do not include the query engine(for example, Rust implementation, which depends on the DataFusion for more SQL-like analytics) in its own repo, but other do include(for example, C++).
There is a comprehensive benchmark by ClickHouse for OLAP but including kinds of embedding engines: https://benchmark.clickhouse.com/
The more interesting is that, in fact, we have not an embedded HTAP engine. One of my database products already implements 3/4 HTAP at the engine layer, but unfortunately it's still just a free software, not an open source implementation.