From 9cff65856d258e4592322fb372e68e761e451586 Mon Sep 17 00:00:00 2001
From: wey-gu <1651790+wey-gu@users.noreply.github.com>
Date: Thu, 25 Nov 2021 15:28:02 +0800
Subject: [PATCH] highlight on bulk edge where filtering expression

close #824
---
 .../7.general-query-statements/2.match.md     | 24 +++++++++++++++++++
 1 file changed, 24 insertions(+)

diff --git a/docs-2.0/3.ngql-guide/7.general-query-statements/2.match.md b/docs-2.0/3.ngql-guide/7.general-query-statements/2.match.md
index d4890d8dacf..64ba769eb29 100644
--- a/docs-2.0/3.ngql-guide/7.general-query-statements/2.match.md
+++ b/docs-2.0/3.ngql-guide/7.general-query-statements/2.match.md
@@ -368,6 +368,30 @@ nebula> MATCH (v:player{name:"Tim Duncan"}) -[*0]-> (v2) \
 +----------------------------------------------------+
 ```
 
+!!! Note
+
+    如果想要通过描述多跳的边的过滤条件，比如`-[e:follow*2]->`，这时候 `e` 不再试单条边时候的数据类型了，而是一列边的符合类型，例如：
+    这是错误的表达，因为`e`是一个边的列表，没有`.degree`的属性
+```ngql
+nebula> MATCH p=(v:player{name:"Tim Duncan"})-[e:follow*2]->(v2) \
+        WHERE e.degree > 1 \
+        RETURN DISTINCT v2 AS Friends;
+```
+    这是正确的表达：
+```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;
+```
+
+    进一步，这是表达对多跳边的第一跳的边属性过滤的表达：
+
+```ngql
+nebula> MATCH p=(v:player{name:"Tim Duncan"})-[e:follow*2]->(v2) \
+        WHERE e[0].degree > 98 \
+        RETURN DISTINCT v2 AS Friends;
+```
+
 ### 匹配变长路径
 
 用户可以在模式中使用`:<edge_type>*[minHop]..<maxHop>`匹配变长路径。