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Get Subgraph filter #2242

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Oct 28, 2022
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Get Subgraph filter #2242

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Update 1.get-subgraph.md
foesa-yang Oct 19, 2022
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16 changes: 12 additions & 4 deletions docs-2.0/3.ngql-guide/16.subgraph-and-path/1.get-subgraph.md
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Expand Up @@ -7,6 +7,7 @@
```ngql
GET SUBGRAPH [WITH PROP] [<step_count> STEPS] FROM {<vid>, <vid>...}
[{IN | OUT | BOTH} <edge_type>, <edge_type>...]
[WHERE <expression> [AND <expression> ...]]
YIELD [VERTICES AS <vertex_alias>] [, EDGES AS <edge_alias>];
```

Expand All @@ -18,17 +19,24 @@ YIELD [VERTICES AS <vertex_alias>] [, EDGES AS <edge_alias>];

- `edge_type`：指定 Edge type。可以用`IN`、`OUT`和`BOTH`来指定起始点上该 Edge type 的方向。默认为`BOTH`。

- `YIELD`：定义需要返回的输出。可以仅返回点或边。必须设置别名。

!!! caution
- `WHERE`：指定遍历的过滤条件，可以结合布尔运算符 AND 使用。

`GET SUBGRAPH`语句不支持使用`WHERE`子句。
- `YIELD`：定义需要返回的输出。可以仅返回点或边。必须设置别名。

!!! note

`GET SUBGRAPH`语句检索的路径类型为`trail`，即检索的路径只有点可以重复，边不可以重复。详情请参见[路径](../../1.introduction/2.1.path.md)。

## WHERE 语句限制

在`GET SUBGRAPH`语句中使用`WHERE`子句，注意以下限制：

- **仅支持** `AND` 算法符。
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- **仅支持**过滤目的点，点的格式为`$$.tagName.propName`。
- **支持**数学函数、聚合函数、字符串函数、日期时间函数、列表函数中的通用函数和类型转化函数。
- **不支持**聚合函数、Schema 函数、条件表达式函数、谓词函数、geo 函数和自定义函数，列表函数中除通用函数以外的函数。


## 示例

以下面的示例图进行演示。
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