diff --git a/crates/fluss/src/row/datum.rs b/crates/fluss/src/row/datum.rs
index ed33b8b..3e48703 100644
--- a/crates/fluss/src/row/datum.rs
+++ b/crates/fluss/src/row/datum.rs
@@ -44,6 +44,8 @@ pub enum Datum<'a> {
     #[display("{0}")]
     Bool(bool),
     #[display("{0}")]
+    Int8(i8),
+    #[display("{0}")]
     Int16(i16),
     #[display("{0}")]
     Int32(i32),
@@ -78,6 +80,13 @@ impl Datum<'_> {
             _ => panic!("not a string: {self:?}"),
         }
     }
+
+    pub fn as_blob(&self) -> &[u8] {
+        match self {
+            Self::Blob(blob) => blob.as_ref(),
+            _ => panic!("not a blob: {self:?}"),
+        }
+    }
 }
 
 // ----------- implement from
@@ -95,6 +104,20 @@ impl<'a> From<i64> for Datum<'a> {
     }
 }
 
+impl<'a> From<i8> for Datum<'a> {
+    #[inline]
+    fn from(i: i8) -> Datum<'a> {
+        Datum::Int8(i)
+    }
+}
+
+impl<'a> From<i16> for Datum<'a> {
+    #[inline]
+    fn from(i: i16) -> Datum<'a> {
+        Datum::Int16(i)
+    }
+}
+
 impl<'a> From<&'a str> for Datum<'a> {
     #[inline]
     fn from(s: &'a str) -> Datum<'a> {
@@ -134,6 +157,18 @@ impl TryFrom<&Datum<'_>> for i32 {
     }
 }
 
+impl TryFrom<&Datum<'_>> for i16 {
+    type Error = ();
+
+    #[inline]
+    fn try_from(from: &Datum) -> std::result::Result<Self, Self::Error> {
+        match from {
+            Datum::Int16(i) => Ok(*i),
+            _ => Err(()),
+        }
+    }
+}
+
 impl TryFrom<&Datum<'_>> for i64 {
     type Error = ();
 
@@ -146,6 +181,42 @@ impl TryFrom<&Datum<'_>> for i64 {
     }
 }
 
+impl TryFrom<&Datum<'_>> for f32 {
+    type Error = ();
+
+    #[inline]
+    fn try_from(from: &Datum) -> std::result::Result<Self, Self::Error> {
+        match from {
+            Datum::Float32(f) => Ok(f.into_inner()),
+            _ => Err(()),
+        }
+    }
+}
+
+impl TryFrom<&Datum<'_>> for f64 {
+    type Error = ();
+
+    #[inline]
+    fn try_from(from: &Datum) -> std::result::Result<Self, Self::Error> {
+        match from {
+            Datum::Float64(f) => Ok(f.into_inner()),
+            _ => Err(()),
+        }
+    }
+}
+
+impl TryFrom<&Datum<'_>> for bool {
+    type Error = ();
+
+    #[inline]
+    fn try_from(from: &Datum) -> std::result::Result<Self, Self::Error> {
+        match from {
+            Datum::Bool(b) => Ok(*b),
+            _ => Err(()),
+        }
+    }
+}
+
 impl<'a> TryFrom<&Datum<'a>> for &'a str {
     type Error = ();
 
@@ -158,6 +229,25 @@ impl<'a> TryFrom<&Datum<'a>> for &'a str {
     }
 }
 
+impl TryFrom<&Datum<'_>> for i8 {
+    type Error = ();
+
+    #[inline]
+    fn try_from(from: &Datum) -> std::result::Result<Self, Self::Error> {
+        match from {
+            Datum::Int8(i) => Ok(*i),
+            _ => Err(()),
+        }
+    }
+}
+
+impl<'a> From<bool> for Datum<'a> {
+    #[inline]
+    fn from(b: bool) -> Datum<'a> {
+        Datum::Bool(b)
+    }
+}
+
 pub trait ToArrow {
     fn append_to(&self, builder: &mut dyn ArrayBuilder) -> Result<()>;
 }
@@ -184,6 +274,7 @@ impl Datum<'_> {
 
         match self {
             Datum::Null => {
+                append_null_to_arrow!(Int8Builder);
                 append_null_to_arrow!(BooleanBuilder);
                 append_null_to_arrow!(Int16Builder);
                 append_null_to_arrow!(Int32Builder);
@@ -194,6 +285,7 @@ impl Datum<'_> {
                 append_null_to_arrow!(BinaryBuilder);
             }
             Datum::Bool(v) => append_value_to_arrow!(BooleanBuilder, *v),
+            Datum::Int8(v) => append_value_to_arrow!(Int8Builder, *v),
             Datum::Int16(v) => append_value_to_arrow!(Int16Builder, *v),
             Datum::Int32(v) => append_value_to_arrow!(Int32Builder, *v),
             Datum::Int64(v) => append_value_to_arrow!(Int64Builder, *v),
diff --git a/crates/fluss/src/row/mod.rs b/crates/fluss/src/row/mod.rs
index aa2c411..a3b8885 100644
--- a/crates/fluss/src/row/mod.rs
+++ b/crates/fluss/src/row/mod.rs
@@ -85,16 +85,16 @@ impl<'a> InternalRow for GenericRow<'a> {
         false
     }
 
-    fn get_boolean(&self, _pos: usize) -> bool {
-        todo!()
+    fn get_boolean(&self, pos: usize) -> bool {
+        self.values.get(pos).unwrap().try_into().unwrap()
     }
 
-    fn get_byte(&self, _pos: usize) -> i8 {
-        todo!()
+    fn get_byte(&self, pos: usize) -> i8 {
+        self.values.get(pos).unwrap().try_into().unwrap()
     }
 
-    fn get_short(&self, _pos: usize) -> i16 {
-        todo!()
+    fn get_short(&self, pos: usize) -> i16 {
+        self.values.get(pos).unwrap().try_into().unwrap()
     }
 
     fn get_int(&self, pos: usize) -> i32 {
@@ -105,28 +105,36 @@ impl<'a> InternalRow for GenericRow<'a> {
         self.values.get(_pos).unwrap().try_into().unwrap()
     }
 
-    fn get_float(&self, _pos: usize) -> f32 {
-        todo!()
+    fn get_float(&self, pos: usize) -> f32 {
+        self.values.get(pos).unwrap().try_into().unwrap()
     }
 
-    fn get_double(&self, _pos: usize) -> f64 {
-        todo!()
+    fn get_double(&self, pos: usize) -> f64 {
+        self.values.get(pos).unwrap().try_into().unwrap()
     }
 
-    fn get_char(&self, _pos: usize, _length: usize) -> String {
-        todo!()
+    fn get_char(&self, pos: usize, length: usize) -> String {
+        let value = self.get_string(pos);
+        if value.len() != length {
+            panic!(
+                "Length mismatch for fixed-size char: expected {}, got {}",
+                length,
+                value.len()
+            );
+        }
+        value.to_string()
     }
 
     fn get_string(&self, pos: usize) -> &str {
         self.values.get(pos).unwrap().try_into().unwrap()
     }
 
-    fn get_binary(&self, _pos: usize, _length: usize) -> Vec<u8> {
-        todo!()
+    fn get_binary(&self, pos: usize, _length: usize) -> Vec<u8> {
+        self.values.get(pos).unwrap().as_blob().to_vec()
     }
 
-    fn get_bytes(&self, _pos: usize) -> Vec<u8> {
-        todo!()
+    fn get_bytes(&self, pos: usize) -> Vec<u8> {
+        self.values.get(pos).unwrap().as_blob().to_vec()
     }
 }