Update 4.schema.md (#2685)

* Update 4.schema.md * Update docs-2.0/3.ngql-guide/6.functions-and-expressions/4.schema.md --------- Co-authored-by: randomJoe211 <[email protected]>
vesoft-inc · Apr 12, 2023 · 85f0e2f · 85f0e2f
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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
@@ -366,6 +366,58 @@ 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            |
+...
++---------------+
+
+-->
+
 ### 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。