Derive Eq and PartialEq for SortOptions (#425)

diff --git a/arrow/src/compute/kernels/sort.rs b/arrow/src/compute/kernels/sort.rs
index 0a02167..c5e05a6 100644
--- a/arrow/src/compute/kernels/sort.rs
+++ b/arrow/src/compute/kernels/sort.rs
@@ -361,7 +361,7 @@
 }
 
 /// Options that define how sort kernels should behave
-#[derive(Clone, Copy, Debug)]
+#[derive(Clone, Copy, Debug, Eq, PartialEq)]
 pub struct SortOptions {
     /// Whether to sort in descending order
     pub descending: bool,