correctly treat backslash in datafusion-cli #39148

Job	Run time
Check License Header	2m 30s
Check cargo fmt	39s
build with wasm-pack	3m 33s
linux build test	4m 57s
cargo test (macos-aarch64)	10m 6s
Verify MSRV (Min Supported Rust Version)	8m 2s
Verify Vendored Code	52s
cargo check datafusion	5m 22s
cargo check no default features	8m 19s
cargo doc	4m 15s
cargo check functions	2m 22s
cargo test (amd64)	16m 3s
cargo test doc (amd64)	17m 34s
cargo examples (amd64)	16m 22s
Run sqllogictest with Postgres runner	5m 37s
cargo test pyarrow (amd64)	3m 26s
verify benchmark results (amd64)	8m 55s
check Cargo.toml formatting	3m 1s
clippy	5m 48s
check configs.md and ***_functions.md is up-to-date	4m 12s
	2h 11m 55s

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