Function laminar_schema_field_type 

#[unsafe(no_mangle)]
pub unsafe extern "C" fn laminar_schema_field_type(
    schema: *mut LaminarSchema,
    index: usize,
    out: *mut *mut c_char,
) -> i32

Get the Arrow data type of a field by index as a string. Caller frees with laminar_string_free.

Safety

schema and out must be valid non-null pointers; index must be in range.