From b6911c4aa3b84884a19fc47812234799f67bb87b Mon Sep 17 00:00:00 2001
From: Abby <78209557+abby-cyber@users.noreply.github.com>
Date: Mon, 27 Mar 2023 15:46:51 +0800
Subject: [PATCH] Update 4.schema.md

---
 .../6.functions-and-expressions/4.schema.md   | 54 +++++++++++++++++++
 1 file changed, 54 insertions(+)

diff --git a/docs-2.0/3.ngql-guide/6.functions-and-expressions/4.schema.md b/docs-2.0/3.ngql-guide/6.functions-and-expressions/4.schema.md
index 831bf971b6a..5b22ab5296b 100644
--- a/docs-2.0/3.ngql-guide/6.functions-and-expressions/4.schema.md
+++ b/docs-2.0/3.ngql-guide/6.functions-and-expressions/4.schema.md
@@ -366,6 +366,60 @@ nebula> MATCH (v:player{name:"Tim Duncan"})-[e]->() \
 +-------------+
 ```
 
+<!-- 方便计算下推，用于POC，暂不对外发布，无英文文档
+
+### none_direct_src()
+
+none_direct_src() 返回的是不指定边方向的的起点 ID，而是指定边的编码的四元组（`_src`、`_dst`、`_rank`、`_type`）中`_src`字段。
+
+语法：`none_direct_src(<edge>)`
+
+示例：
+
+```ngql
+nebula> MATCH (v:player)-[e:follow]->(v2)  \
+        WHERE none_direct_src(e) \
+        IN ["player100", "player101"] \
+        RETURN v2.player.age;
++---------------+
+| v2.player.age |
++---------------+
+| 36            |
+| 41            |
+| 42            |
+| 33            |
+| 41            |
++---------------+
+
+
+### none_direct_dst()
+
+none_direct_dst() 返回的是不指定边方向的的终点 ID，而是指定边的编码的四元组（`_src`、`_dst`、`_rank`、`_type`）中`_dst`字段。
+
+语法：`none_direct_dst(<edge>)`
+
+示例：
+
+```ngql
+nebula> MATCH (v:player)-[e:follow]->(v2)  \
+        WHERE none_direct_dst(e) \
+        IN ["player100", "player101"] \
+        RETURN v2.player.age;
++---------------+
+| v2.player.age |
++---------------+
+| 36            |
+| 42            |
+| 42            |
+| 42            |
+| 42            |
+...
++---------------+
+
+-->
+
+### none
+
 ### startNode()
 
 startNode() 获取一条路径并返回它的起始点信息，包括点 ID、Tag、属性和值。