Rust

Minor: Add `Column::from(Tableref, &FieldRef)`, `Expr::from(Column)` … #15

Job	Run time
cargo check	8m 8s
cargo test (macos)	34m 16s
build with wasm-pack	2m 14s
cargo test (macos-aarch64)	9m 29s
cargo test (win64)	40m 47s
Check cargo fmt	54s
Verify MSRV (Min Supported Rust Version)	6m 17s
Verify Vendored Code	50s
check Cargo.toml formatting	2m 54s
cargo test hash collisions (amd64)	10m 17s
clippy	4m 53s
check configs.md is up-to-date	2m 24s
cargo doc	3m 19s
cargo test (amd64)	10m 16s
cargo test datafusion-cli (amd64)	3m 38s
cargo test doc (amd64)	11m 26s
Run sqllogictest with Postgres runner	3m 29s
cargo examples (amd64)	10m 49s
cargo test pyarrow (amd64)	2m 36s
verify benchmark results (amd64)	10m 30s
	2h 59m 26s

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