From 84c00582b0d11bd986f8236291bb521df43dda8b Mon Sep 17 00:00:00 2001
From: Ritchie Vink <ritchie46@gmail.com>
Date: Tue, 23 Nov 2021 08:55:49 +0100
Subject: [PATCH] test type correctness

---
 src/array/fixed_size_binary/mod.rs | 11 +++++++++++
 1 file changed, 11 insertions(+)

diff --git a/src/array/fixed_size_binary/mod.rs b/src/array/fixed_size_binary/mod.rs
index 959e9cd3b64..1a349260960 100644
--- a/src/array/fixed_size_binary/mod.rs
+++ b/src/array/fixed_size_binary/mod.rs
@@ -138,8 +138,19 @@ impl FixedSizeBinaryArray {
 
     /// Returns a new [`FixedSizeBinary`] with a different logical type.
     /// This is `O(1)`.
+    /// # Panics
+    /// Panics iff the data_type is not supported for the physical type.
     #[inline]
     pub fn to(self, data_type: DataType) -> Self {
+        match (
+            data_type.to_physical_type(),
+            self.data_type().to_physical_type(),
+        ) {
+            (DataType::FixedSizeBinary(size_a), DataType::FixedSizeBinary(size_b))
+                if size_a == size_b => {}
+            _ => panic!("Wrong DataType"),
+        }
+
         Self {
             size: self.size,
             data_type,