From ed7be8a29bdd6187047fb9c4b857fd78a7341f37 Mon Sep 17 00:00:00 2001
From: Chris Tsang <chris.2y3@outlook.com>
Date: Tue, 10 Jan 2023 15:35:56 +0800
Subject: [PATCH] Improve error message

---
 src/database/mock.rs | 9 +++++++--
 1 file changed, 7 insertions(+), 2 deletions(-)

diff --git a/src/database/mock.rs b/src/database/mock.rs
index b12717eb5..ed52b4907 100644
--- a/src/database/mock.rs
+++ b/src/database/mock.rs
@@ -209,8 +209,13 @@ impl MockRow {
         T: ValueType,
     {
         if let Some(index) = index.as_str() {
-            T::try_from(self.values.get(index).unwrap().clone())
-                .map_err(|e| DbErr::Type(e.to_string()))
+            T::try_from(
+                self.values
+                    .get(index)
+                    .unwrap_or_else(|| panic!("No column for ColIdx {:?}", index))
+                    .clone(),
+            )
+            .map_err(|e| DbErr::Type(e.to_string()))
         } else if let Some(index) = index.as_usize() {
             let (_, value) = self.values.iter().nth(*index).ok_or_else(|| {
                 DbErr::Query(RuntimeErr::Internal(format!(