Revert "Account for constant equivalence properties in union, tests (… #464

Job	Run time
build with wasm-pack	3m 8s
Check cargo fmt	45s
cargo test (macos)	17m 21s
cargo check	10m 33s
cargo test (macos-aarch64)	16m 41s
Verify MSRV (Min Supported Rust Version)	9m 13s
Verify Vendored Code	49s
cargo test (win64)	55m 24s
check configs.md and ***_functions.md is up-to-date	3m 28s
clippy	6m 9s
check Cargo.toml formatting	2m 58s
cargo test hash collisions (amd64)	14m 41s
cargo doc	4m 3s
cargo test (amd64)	10m 24s
cargo test doc (amd64)	16m 0s
cargo test datafusion-cli (amd64)	4m 17s
cargo examples (amd64)	13m 39s
Run sqllogictest with Postgres runner	3m 46s
cargo test pyarrow (amd64)	3m 4s
verify benchmark results (amd64)	13m 14s
	3h 29m 37s

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