Add support for utf8view to nvl function #34978

Job	Run time
Check License Header	2m 19s
cargo check	8m 18s
cargo test (win64)	1h 13m 21s
build with wasm-pack	2m 48s
Check cargo fmt	50s
cargo test (macos)	13m 27s
cargo test (macos-aarch64)	15m 53s
Verify MSRV (Min Supported Rust Version)	9m 26s
Verify Vendored Code	57s
cargo test datafusion-cli (amd64)	4m 18s
cargo test (amd64)	12m 12s
clippy	7m 13s
cargo doc	4m 35s
cargo test doc (amd64)	16m 11s
cargo examples (amd64)	14m 23s
Run sqllogictest with Postgres runner	3m 43s
cargo test pyarrow (amd64)	2m 58s
verify benchmark results (amd64)	13m 16s
check Cargo.toml formatting	3m 0s
check configs.md and ***_functions.md is up-to-date	3m 36s
cargo test hash collisions (amd64)	17m 16s
	3h 50m 0s

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