DataFusion is an extensible query execution framework, written in Rust, that uses Apache Arrow as its in-memory format.
The DataFusion CLI is a command line utility that runs SQL queries using the DataFusion engine.
Answer: See the datafusion-cli documentation for further information.
Answer: "open" the datafusion/datafusion-cli project as its own top level
project in my IDE (rather than opening datafusion)
The reason datafusion-cli is not listed as part of the workspace in the main
datafusion Cargo.toml file is that datafusion-cli is a binary and has a
checked in Cargo.lock file to ensure reproducible builds.
However, the datafusion and sub crates are intended for use as libraries and
thus do not have a Cargo.lock file checked in.