Minor: Avoid copying all expressions in `Analzyer` / `check_plan` #25414

Job	Run time
cargo check	4m 1s
build with wasm-pack	2m 19s
cargo test (macos)	15m 13s
cargo test (macos-aarch64)	8m 54s
cargo test (win64)	41m 48s
Check cargo fmt	38s
Verify Vendored Code	57s
Verify MSRV (Min Supported Rust Version)	6m 55s
cargo test (amd64)	9m 7s
cargo examples (amd64)	10m 15s
circular dependency check	2m 32s
cargo doc	3m 50s
cargo test datafusion-cli (amd64)	3m 37s
cargo test doc (amd64)	11m 21s
Run sqllogictest with Postgres runner	3m 8s
cargo test pyarrow (amd64)	2m 34s
verify benchmark results (amd64)	10m 13s
check Cargo.toml formatting	2m 53s
clippy	5m 15s
check configs.md is up-to-date	2m 27s
cargo test hash collisions (amd64)	8m 40s
	2h 36m 37s

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