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Update 4.pipe.md #1113

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Nov 1, 2021
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Update 4.pipe.md #1113

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10 changes: 6 additions & 4 deletions docs-2.0/3.ngql-guide/5.operators/4.pipe.md
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Original file line number Diff line number Diff line change
Expand Up @@ -24,9 +24,11 @@ nebula> GO FROM "player100" OVER follow \
+-------------+
| follow._dst |
+-------------+
| "player101" |
| "player100" |
| "player102" |
| "player125" |
| "player100" |
+-------------+
...
```

用户可以使用`YIELD`显式声明需要返回的结果，如果不使用`YIELD`，默认返回目标点ID。
Expand All @@ -35,7 +37,7 @@ nebula> GO FROM "player100" OVER follow \

## 性能提示

Nebula Graph {{ nebula.release }} 中的管道对性能有影响，以`A | B`为例，体现在以下几个方面：
Nebula Graph 中的管道对性能有影响，以`A | B`为例，体现在以下几个方面：

1. 管道是同步操作。也即需要管道之前的子句`A`执行完毕后，数据才能整体进入管道子句。

Expand All @@ -51,4 +53,4 @@ Nebula Graph {{ nebula.release }} 中的管道对性能有影响，以`A | B`为

4. 每个 graphd 执行部分 B。

这样通常比单个graphd 执行完整地`A | B`要快很多。
这样通常比单个 graphd 执行完整地`A | B`要快很多。