Function get_data_dir

datafusion/common/src/test_util.rs:279–319

Returns a directory path for finding test data. udf_env: name of an environment variable submodule_dir: fallback path (relative to CARGO_MANIFEST_DIR) Returns either: The path referred to in `udf_env` if that variable is set and refers to a directory The submodule_data directory relative to CARGO_MANIFEST_PATH

(
    udf_env: &str,
    submodule_data: &str,
)

/// The path referred to in `udf_env` if that variable is set and refers to a directory
/// The submodule_data directory relative to CARGO_MANIFEST_PATH
pub fn get_data_dir(
    udf_env: &str,
    submodule_data: &str,
) -> Result<PathBuf, Box<dyn Error>> {
    // Try user defined env.
    if let Ok(dir) = std::env::var(udf_env) {
        let trimmed = dir.trim().to_string();
        if !trimmed.is_empty() {
            let pb = PathBuf::from(trimmed);
            if pb.is_dir() {
                return Ok(pb);
            } else {
                return Err(format!(
                    "the data dir `{}` defined by env {} not found",
                    pb.display(),
                    udf_env
                )
                .into());
            }
        }
    }

    // The env is undefined or its value is trimmed to empty, let's try default dir.

    // env "CARGO_MANIFEST_DIR" is "the directory containing the manifest of your package",
    // set by `cargo run` or `cargo test`, see:
    // https://doc.rust-lang.org/cargo/reference/environment-variables.html
    let dir = env!("CARGO_MANIFEST_DIR");

    let pb = PathBuf::from(dir).join(submodule_data);
    if pb.is_dir() {
        Ok(pb)
    } else {
        Err(format!(
            "env `{}` is undefined or has empty value, and the pre-defined data dir `{}` not found\n\
             HINT: try running `git submodule update --init`",
            udf_env,
            pb.display(),
        ).into())
    }
}

#[macro_export]
macro_rules! create_array {