Rust

Preserve constant values across union operations #36320

Job	Run time
Check cargo fmt	45s
Check License Header	2m 20s
cargo check	13m 32s
cargo test (macos)	12m 47s
build with wasm-pack	3m 12s
cargo test (macos-aarch64)	13m 51s
Verify MSRV (Min Supported Rust Version)	9m 22s
Verify Vendored Code	49s
cargo test (amd64)	12m 12s
cargo test datafusion-cli (amd64)	4m 46s
cargo test doc (amd64)	18m 10s
cargo examples (amd64)	14m 40s
check Cargo.toml formatting	2m 52s
clippy	7m 14s
check configs.md and ***_functions.md is up-to-date	3m 42s
cargo test hash collisions (amd64)	29m 1s
cargo doc	4m 33s
Run sqllogictest with Postgres runner	4m 16s
cargo test pyarrow (amd64)	3m 4s
verify benchmark results (amd64)	15m 11s
	2h 56m 19s

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