diff --git a/src/common/src/array/stream_chunk.rs b/src/common/src/array/stream_chunk.rs
index e3776de6d0fbc..b80e7a0530d01 100644
--- a/src/common/src/array/stream_chunk.rs
+++ b/src/common/src/array/stream_chunk.rs
@@ -525,6 +525,12 @@ impl OpRowMutRef<'_> {
 }
 
 impl StreamChunkMut {
+
+    pub fn capacity(&self) -> usize {
+        self.vis.len()
+    }
+
+
     pub fn vis(&self, i: usize) -> bool {
         self.vis.is_set(i)
     }
diff --git a/src/stream/src/executor/hash_join.rs b/src/stream/src/executor/hash_join.rs
index aa8afa35339e4..66e91cf2ecf2a 100644
--- a/src/stream/src/executor/hash_join.rs
+++ b/src/stream/src/executor/hash_join.rs
@@ -2607,8 +2607,8 @@ mod tests {
             chunk,
             StreamChunk::from_pretty(
                 "  I I I I
-                - 2 5 . .
-                + 2 5 2 7"
+                U- 2 5 . .
+                U+ 2 5 2 7"
             )
         );
 
@@ -2619,8 +2619,8 @@ mod tests {
             chunk,
             StreamChunk::from_pretty(
                 "  I I I I
-                - 3 6 . .
-                + 3 6 3 10"
+                U- 3 6 . .
+                U+ 3 6 3 10"
             )
         );
 
@@ -2691,8 +2691,8 @@ mod tests {
             chunk,
             StreamChunk::from_pretty(
                 "  I I I I
-                - 2 5 . .
-                + 2 5 2 7"
+                U- 2 5 . .
+                U+ 2 5 2 7"
             )
         );
 
@@ -2703,8 +2703,8 @@ mod tests {
             chunk,
             StreamChunk::from_pretty(
                 "  I I I I
-                - . 6 . .
-                + . 6 . 10"
+                U- . 6 . .
+                U+ . 6 . 10"
             )
         );
 
@@ -2844,10 +2844,10 @@ mod tests {
             chunk,
             StreamChunk::from_pretty(
                 "  I I I I I I
-                - 2 5 2 . . .
-                + 2 5 2 2 5 1
-                - 4 9 4 . . .
-                + 4 9 4 4 9 2"
+                U- 2 5 2 . . .
+                U+ 2 5 2 2 5 1
+                U- 4 9 4 . . .
+                U+ 4 9 4 4 9 2"
             )
         );
 
@@ -2858,10 +2858,10 @@ mod tests {
             chunk,
             StreamChunk::from_pretty(
                 "  I I I I I I
-                - 1 4 1 . . .
-                + 1 4 1 1 4 4
-                - 3 6 3 . . .
-                + 3 6 3 3 6 5"
+                U- 1 4 1 . . .
+                U+ 1 4 1 1 4 4
+                U- 3 6 3 . . .
+                U+ 3 6 3 3 6 5"
             )
         );
 
@@ -3003,8 +3003,8 @@ mod tests {
             chunk,
             StreamChunk::from_pretty(
                 "  I I I I
-                -  2 5 . .
-                +  2 5 2 7
+                U-  2 5 . .
+                U+  2 5 2 7
                 +  . . 4 8
                 +  . . 6 9"
             )
@@ -3060,8 +3060,8 @@ mod tests {
             chunk,
             StreamChunk::from_pretty(
                 " I I I I
-                - 1 1 . .
-                + 1 1 1 1"
+                U- 1 1 . .
+                U+ 1 1 1 1"
             )
         );
 
@@ -3156,8 +3156,8 @@ mod tests {
             chunk,
             StreamChunk::from_pretty(
                 "  I I I I
-                -  2 5 . .
-                +  2 5 2 6
+                U-  2 5 . .
+                U+  2 5 2 6
                 +  . . 4 8
                 +  . . 3 4" /* regression test (#2420): 3 4 should be forwarded only once
                              * despite matching on eq join on 2
diff --git a/src/stream/src/executor/join/builder.rs b/src/stream/src/executor/join/builder.rs
index d8c36e98ce0b3..e8240773b415e 100644
--- a/src/stream/src/executor/join/builder.rs
+++ b/src/stream/src/executor/join/builder.rs
@@ -12,6 +12,7 @@
 // See the License for the specific language governing permissions and
 // limitations under the License.
 
+use risingwave_common::array::stream_chunk::StreamChunkMut;
 use risingwave_common::array::stream_chunk_builder::StreamChunkBuilder;
 use risingwave_common::array::{Op, RowRef, StreamChunk};
 use risingwave_common::row::{OwnedRow, Row};
@@ -157,7 +158,26 @@ impl<const T: JoinTypePrimitive, const SIDE: SideTypePrimitive> JoinChunkBuilder
     }
 
     pub fn post_process(c: StreamChunk) -> StreamChunk {
-        todo!()
+        let mut c = StreamChunkMut::from(c);
+
+        // NOTE(st1page): remove the pattern `UpdateDel(k, old), UpdateIns(k, NULL), UpdateDel(k, NULL),  UpdateIns(k, new)`
+        // to avoid this issue <https://github.com/risingwavelabs/risingwave/issues/17450>
+        let mut i = 1;
+        while i < c.capacity() {
+            if c.op(i - 1) == Op::UpdateInsert
+                && c.op(i) == Op::UpdateDelete
+                && c.row_ref(i) == c.row_ref(i - 1)
+            {
+                c.set_op(i - 2, Op::Delete);
+                c.set_vis(i - 1, false);
+                c.set_vis(i, false);
+                c.set_op(i + 1, Op::Insert);
+                i += 3;
+            } else {
+                i += 1;
+            }
+        }
+        c.into()
     }
 
     pub fn with_match_on_insert(
@@ -287,8 +307,6 @@ impl<const T: JoinTypePrimitive, const SIDE: SideTypePrimitive> JoinChunkBuilder
 
     #[inline]
     pub fn take(&mut self) -> Option<StreamChunk> {
-        self.stream_chunk_builder
-            .take()
-            .map(Self::post_process)
+        self.stream_chunk_builder.take().map(Self::post_process)
     }
 }