Simply expression rewrite in ProjectionPushdown, make more general #2440

Job	Run time
cargo check	6m 42s
build with wasm-pack	2m 44s
cargo test (mac)	13m 21s
Verify Vendored Code	1m 9s
cargo test (win64)	25m 51s
Check cargo fmt	36s
Verify MSRV	10m 8s
cargo test (amd64)	16m 23s
cargo test datafusion-cli (amd64)	2m 59s
cargo doc	3m 14s
cargo test doc (amd64)	17m 27s
cargo examples (amd64)	6m 3s
Run sqllogictest with Postgres runner	3m 4s
cargo test pyarrow (amd64)	2m 6s
verify benchmark results (amd64)	21m 16s
check Cargo.toml formatting	1m 18s
clippy	6m 37s
check configs.md is up-to-date	3m 25s
cargo test hash collisions (amd64)	8m 36s
	2h 32m 59s

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