From 42fbfb4091df3fad3b79ee572373db20ceddfe02 Mon Sep 17 00:00:00 2001
From: "Jorge C. Leitao" <jorgecarleitao@gmail.com>
Date: Sat, 23 Jul 2022 05:58:03 +0000
Subject: [PATCH] Improved error message

---
 src/array/specification.rs | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/src/array/specification.rs b/src/array/specification.rs
index 8c35194f96b..2b189b76afc 100644
--- a/src/array/specification.rs
+++ b/src/array/specification.rs
@@ -99,14 +99,14 @@ pub fn try_check_offsets<O: Offset>(offsets: &[O], values_len: usize) -> Result<
 
 pub fn check_indexes<K>(keys: &[K], len: usize) -> Result<()>
 where
-    K: Copy + TryInto<usize>,
+    K: std::fmt::Debug + Copy + TryInto<usize>,
 {
     keys.iter().try_for_each(|key| {
         let key: usize = (*key)
             .try_into()
-            .map_err(|_| Error::oos("The dictionary key must fit in a `usize`"))?;
+            .map_err(|_| Error::oos(format!("The dictionary key must fit in a `usize`, but {:?} does not", key)))?;
         if key >= len {
-            Err(Error::oos("The dictionary key must be smaller"))
+            Err(Error::oos(format!("One of the dictionary keys is {} but it must be < than the length of the dictionary values, which is {}", key, len)))
         } else {
             Ok(())
         }