add delta join img

Author: wuchong

website/blog/assets/0.6/delta-join.jpg

@@ -146,7 +146,7 @@ when data arrives from the left stream, the right table is queried using the joi
 This approach eliminates join state like Lookup Join, while preserving the semantics of a Stream-Stream Join (any updates on either side triggers an update to the join result).
 Delta Join addresses challenges such as high cost, unstable job, checkpoint timeout, slow restart recovery, etc., in the traditional Stream-Stream Join.
 
-TODO img
+![Delta Join](../assets/0.6/delta-join.jpg)
 
 Overall, Delta Join relies on three core functionalities:
 - **CDC Stream Read for Source Table**: The foundational capability of Fluss.