Function arrow::compute::interleave

pub fn interleave(
    values: &[&dyn Array],
    indices: &[(usize, usize)]
) -> Result<Arc<dyn Array + 'static>, ArrowError>

Takes elements by index from a list of Array, creating a new Array from those values.

Each element in indices is a pair of usize with the first identifying the index of the Array in values, and the second the index of the value within that Array

┌─────────────────┐      ┌─────────┐                                  ┌─────────────────┐
│        A        │      │ (0, 0)  │        interleave(               │        A        │
├─────────────────┤      ├─────────┤          [values0, values1],     ├─────────────────┤
│        D        │      │ (1, 0)  │          indices                 │        B        │
└─────────────────┘      ├─────────┤        )                         ├─────────────────┤
  values array 0         │ (1, 1)  │      ─────────────────────────▶  │        C        │
                         ├─────────┤                                  ├─────────────────┤
                         │ (0, 1)  │                                  │        D        │
                         └─────────┘                                  └─────────────────┘
┌─────────────────┐       indices
│        B        │        array
├─────────────────┤                                                    result
│        C        │
├─────────────────┤
│        E        │
└─────────────────┘
  values array 1

For selecting values by index from a single array see crate::interleave