Function arrow2::array::ord::build_compare
source · pub fn build_compare(
left: &dyn Array,
right: &dyn Array
) -> Result<DynComparator>
Expand description
returns a comparison function that compares values at two different slots
between two Array
.
§Example
use arrow2::array::{ord::build_compare, PrimitiveArray};
let array1 = PrimitiveArray::from_slice([1, 2]);
let array2 = PrimitiveArray::from_slice([3, 4]);
let cmp = build_compare(&array1, &array2)?;
// 1 (index 0 of array1) is smaller than 4 (index 1 of array2)
assert_eq!(std::cmp::Ordering::Less, (cmp)(0, 1));
§Error
The arrays’ DataType
must be equal and the types must have a natural order.