Handle one-element array return value in ScalarFunctionExpr (#12965) … #1423

Job	Run time
cargo test (win64)	35m 23s
build with wasm-pack	2m 36s
Check cargo fmt	56s
cargo check	8m 6s
cargo test (macos)	8m 45s
cargo test (macos-aarch64)	10m 30s
Verify Vendored Code	1m 9s
cargo test (amd64)	9m 45s
cargo test doc (amd64)	13m 2s
check Cargo.toml formatting	3m 11s
check configs.md is up-to-date	2m 47s
clippy	5m 29s
cargo test datafusion-cli (amd64)	4m 3s
Run sqllogictest with Postgres runner	3m 31s
cargo test pyarrow (amd64)	3m 3s
verify benchmark results (amd64)	11m 4s
cargo doc	4m 2s
	2h 7m 22s

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