diff --git a/README.md b/README.md
index 5f7f2219..b9c56efd 100755
--- a/README.md
+++ b/README.md
@@ -54,6 +54,21 @@ let fnck_sql = DataBaseBuilder::path("./data").build()?;
 let tuples = fnck_sql.run("select * from t1")?;
 ```
 
+### TPCC
+run `cargo run -p tpcc --release` to run tpcc
+
+- i9-13900HX
+- 32.0 GB
+- YMTC PC411-1024GB-B
+```shell
+<90th Percentile RT (MaxRT)>
+   New-Order : 0.882  (0.947)
+     Payment : 0.080  (0.095)
+Order-Status : 0.235  (0.255)
+    Delivery : 5.386  (5.658)
+ Stock-Level : 0.001  (0.002)
+```
+
 #### PG Wire Service
 run `cargo run --features="net"` to start server
 ![start](./static/images/start.gif)
@@ -138,8 +153,8 @@ table_function!(MyTableFunction::test_numbers(LogicalType::Integer) -> [c1: Logi
         .map(|i| Ok(Tuple {
             id: None,
             values: vec![
-                Arc::new(DataValue::Int32(Some(i))),
-                Arc::new(DataValue::Int32(Some(i))),
+                DataValue::Int32(Some(i)),
+                DataValue::Int32(Some(i)),
             ]
         }))) as Box<dyn Iterator<Item = Result<Tuple, DatabaseError>>>)
 }));
diff --git a/src/binder/update.rs b/src/binder/update.rs
index 0cd5f00e..b2cc49f6 100644
--- a/src/binder/update.rs
+++ b/src/binder/update.rs
@@ -40,7 +40,7 @@ impl<T: Transaction> Binder<'_, '_, T> {
                         Some(table_name.to_string()),
                     )? {
                         ScalarExpression::ColumnRef(column) => {
-                            let expr = if matches!(expression, ScalarExpression::Empty) {
+                            let mut expr = if matches!(expression, ScalarExpression::Empty) {
                                 let default_value = column
                                     .default_value()?
                                     .ok_or(DatabaseError::DefaultNotExist)?;
@@ -48,6 +48,12 @@ impl<T: Transaction> Binder<'_, '_, T> {
                             } else {
                                 expression.clone()
                             };
+                            if &expr.return_type() != column.datatype() {
+                                expr = ScalarExpression::TypeCast {
+                                    expr: Box::new(expr),
+                                    ty: column.datatype().clone(),
+                                }
+                            }
                             value_exprs.push((column, expr));
                         }
                         _ => return Err(DatabaseError::InvalidColumn(ident.to_string())),
diff --git a/src/macros/mod.rs b/src/macros/mod.rs
index 7efc77a0..e6bb0b47 100644
--- a/src/macros/mod.rs
+++ b/src/macros/mod.rs
@@ -25,20 +25,20 @@
 macro_rules! implement_from_tuple {
     ($struct_name:ident, ($($field_name:ident : $field_type:ty => $closure:expr),+)) => {
         impl From<(&::fnck_sql::types::tuple::SchemaRef, ::fnck_sql::types::tuple::Tuple)> for $struct_name {
-            fn from((schema, tuple): (&::fnck_sql::types::tuple::SchemaRef, ::fnck_sql::types::tuple::Tuple)) -> Self {
-                fn try_get<T: 'static>(tuple: &::fnck_sql::types::tuple::Tuple, schema: &::fnck_sql::types::tuple::SchemaRef, field_name: &str) -> Option<::fnck_sql::types::value::DataValue> {
+            fn from((schema, mut tuple): (&::fnck_sql::types::tuple::SchemaRef, ::fnck_sql::types::tuple::Tuple)) -> Self {
+                fn try_get<T: 'static>(tuple: &mut ::fnck_sql::types::tuple::Tuple, schema: &::fnck_sql::types::tuple::SchemaRef, field_name: &str) -> Option<::fnck_sql::types::value::DataValue> {
                     let ty = ::fnck_sql::types::LogicalType::type_trans::<T>()?;
                     let (idx, _) = schema
                         .iter()
                         .enumerate()
                         .find(|(_, col)| col.name() == field_name)?;
 
-                    tuple.values[idx].cast(&ty).ok()
+                    std::mem::replace(&mut tuple.values[idx], ::fnck_sql::types::value::DataValue::Null).cast(&ty).ok()
                 }
 
                 let mut struct_instance = $struct_name::default();
                 $(
-                    if let Some(value) = try_get::<$field_type>(&tuple, schema, stringify!($field_name)) {
+                    if let Some(value) = try_get::<$field_type>(&mut tuple, schema, stringify!($field_name)) {
                         $closure(
                             &mut struct_instance,
                             value
diff --git a/src/types/value.rs b/src/types/value.rs
index 08bbac10..01e2eb89 100644
--- a/src/types/value.rs
+++ b/src/types/value.rs
@@ -563,7 +563,6 @@ impl DataValue {
                         }
                         Utf8Type::Fixed(len) => match unit {
                             CharLengthUnits::Characters => {
-                                debug_assert!((*len as usize) >= v.len());
                                 let chars_len = *len as usize;
                                 let string_bytes =
                                     format!("{:len$}", v, len = chars_len).into_bytes();
diff --git a/tpcc/src/load.rs b/tpcc/src/load.rs
index b9f22abe..0e1a6d54 100644
--- a/tpcc/src/load.rs
+++ b/tpcc/src/load.rs
@@ -430,8 +430,8 @@ impl<S: Storage> Load<S> {
     }
 
     #[allow(unused_assignments)]
-    fn gen_orig(rng: &mut ThreadRng) -> [i32; 100001] {
-        let mut orig = [0; MAX_ITEMS + 1];
+    fn gen_orig(rng: &mut ThreadRng) -> Vec<i32> {
+        let mut orig = vec![0; MAX_ITEMS + 1];
 
         for _ in 0..MAX_ITEMS / 10 {
             let mut pos = 0;
diff --git a/tpcc/src/main.rs b/tpcc/src/main.rs
index 13567875..03881bdf 100644
--- a/tpcc/src/main.rs
+++ b/tpcc/src/main.rs
@@ -67,9 +67,9 @@ fn main() -> Result<(), TpccError> {
     let database = DataBaseBuilder::path(&args.path).build()?;
 
     Load::load_items(&mut rng, &database)?;
-    Load::load_warehouses(&mut rng, &database, 1)?;
-    Load::load_custs(&mut rng, &database, 1)?;
-    Load::load_ord(&mut rng, &database, 1)?;
+    Load::load_warehouses(&mut rng, &database, args.num_ware)?;
+    Load::load_custs(&mut rng, &database, args.num_ware)?;
+    Load::load_ord(&mut rng, &database, args.num_ware)?;
 
     let mut rt_hist = RtHist::new();
     let tests = vec![