Update 2.match.md

docs-2.0/3.ngql-guide/7.general-query-statements/2.match.md

@@ -371,6 +371,34 @@ nebula> MATCH (v:player{name:"Tim Duncan"}) -[*0]-> (v2) \
 +----------------------------------------------------+
 ```
 
+!!! Note
+
+    When you conditionally filter on multi-hop edges, such as `-[e:follow*2]->`, note that the `e` is a list of edges instead of a single edge. 
+
+    For example, the following statement is correct from the syntax point of view which may not get your expected query result, because the `e` is a list without the `.degree` property. 
+
+    ```ngql
+    nebula> MATCH p=(v:player{name:"Tim Duncan"})-[e:follow*2]->(v2) \
+            WHERE e.degree > 1 \
+            RETURN DISTINCT v2 AS Friends;
+    ```
+
+    The correct statement is as follows:
+
+    ```ngql
+    nebula> MATCH p=(v:player{name:"Tim Duncan"})-[e:follow*2]->(v2) \
+            WHERE ALL(e_ in e WHERE e_.degree > 0) \
+            RETURN DISTINCT v2 AS Friends;
+    ```
+
+    Further, the following statement is for filtering the properties of the first-hop edge in multi-hop edges:
+
+    ```ngql
+    nebula> MATCH p=(v:player{name:"Tim Duncan"})-[e:follow*2]->(v2) \
+            WHERE e[0].degree > 98 \
+            RETURN DISTINCT v2 AS Friends;
+    ```
+
 ### Match variable-length paths
 
 You can use the `:<edge_type>*[minHop]..<maxHop>` pattern to match variable-length paths.