Function find_indices

datafusion/common/src/utils/mod.rs:922–931

Find indices of each element in `targets` inside `items`. If one of the elements is absent in `items`, returns an error.

(
    items: &[T],
    targets: impl IntoIterator<Item = S>,
)

/// Find indices of each element in `targets` inside `items`. If one of the
/// elements is absent in `items`, returns an error.
pub fn find_indices<T: PartialEq, S: Borrow<T>>(
    items: &[T],
    targets: impl IntoIterator<Item = S>,
) -> Result<Vec<usize>> {
    targets
        .into_iter()
        .map(|target| items.iter().position(|e| target.borrow().eq(e)))
        .collect::<Option<_>>()
        .ok_or_else(|| _exec_datafusion_err!("Target not found"))
}

/// Transposes the given vector of vectors.
pub fn transpose<T>(original: Vec<Vec<T>>) -> Vec<Vec<T>> {