fix interval units parsing (#12448) #50

Job	Run time
build with wasm-pack	2m 36s
cargo test (win64)	46m 41s
cargo check	10m 12s
Check cargo fmt	35s
cargo test (macos)	12m 51s
cargo test (macos-aarch64)	11m 22s
Verify MSRV (Min Supported Rust Version)	6m 57s
Verify Vendored Code	56s
check Cargo.toml formatting	2m 57s
clippy	5m 48s
check configs.md is up-to-date	2m 49s
cargo test hash collisions (amd64)	14m 44s
cargo doc	4m 20s
cargo test (amd64)	9m 58s
cargo test datafusion-cli (amd64)	4m 7s
cargo test doc (amd64)	15m 22s
cargo examples (amd64)	13m 37s
Run sqllogictest with Postgres runner	3m 35s
verify benchmark results (amd64)	12m 17s
cargo test pyarrow (amd64)	2m 59s
	3h 4m 43s

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