diff --git a/src/query/expression/src/utils/display.rs b/src/query/expression/src/utils/display.rs
index ac0b78fe23284..43498191c1764 100755
--- a/src/query/expression/src/utils/display.rs
+++ b/src/query/expression/src/utils/display.rs
@@ -781,7 +781,7 @@ fn display_decimal_256(num: i256, scale: u8) -> String {
                 buf,
                 "{}.{:0>width$}",
                 num / pow_scale,
-                num % pow_scale,
+                num % pow_scale.abs(),
                 width = scale as usize
             )
             .unwrap();
diff --git a/src/query/storages/common/index/src/index.rs b/src/query/storages/common/index/src/index.rs
index ac8590a7cc13e..42656a87bed62 100644
--- a/src/query/storages/common/index/src/index.rs
+++ b/src/query/storages/common/index/src/index.rs
@@ -20,7 +20,11 @@ pub trait Index {
         let inner_type = data_type.remove_nullable();
         matches!(
             inner_type,
-            DataType::Number(_) | DataType::Date | DataType::Timestamp | DataType::String
+            DataType::Number(_)
+                | DataType::Date
+                | DataType::Timestamp
+                | DataType::String
+                | DataType::Decimal(_)
         )
     }
 }
diff --git a/tests/sqllogictests/suites/base/11_data_type/11_0006_data_type_decimal b/tests/sqllogictests/suites/base/11_data_type/11_0006_data_type_decimal
index 71d9cc1e744f8..eca65a10c5141 100644
--- a/tests/sqllogictests/suites/base/11_data_type/11_0006_data_type_decimal
+++ b/tests/sqllogictests/suites/base/11_data_type/11_0006_data_type_decimal
@@ -330,24 +330,27 @@ statement ok
 insert into t(c1) select CAST(0 AS DECIMAL(6, 2))
 
 query I
-select * from t order by c1 desc;
+select * from t order by c1 desc
 ----
 2.34
 0.00
 -2.34
 
 query I
-select * from t order by c1 asc;
+select * from t order by c1 asc
 ----
 -2.34
 0.00
 2.34
 
-statement error 1067
+query I
 select * from t order by c1 asc limit 0,2
+----
+-2.34
+0.00
 
 query I
-select * from t order by c1 asc limit 1,2;
+select * from t order by c1 asc limit 1,2
 ----
 0.00
 2.34