modify maxHop #1661
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modify maxHop #1661
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cooper-lzy
approved these changes
Apr 14, 2022
cooper-lzy
approved these changes
Apr 18, 2022
randomJoe211
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Apr 19, 2022
| @@ -239,7 +239,7 @@ | |||
| | 匹配多个 Edge type | `MATCH (v:player{name:"Tim Duncan"})-[e:follow | :serve]->(v2) RETURN e` | 使用`|`可以匹配多个 Edge type，例如`[e:follow | :serve]`。第一个 Edge type 前的英文冒号（:）不可省略，后续 Edge type 前的英文冒号可以省略，例如`[e:follow | serve]`。 | | |||
| | 匹配多条边 | `MATCH (v:player{name:"Tim Duncan"})-[]->(v2)<-[e:serve]-(v3) RETURN v2, v3` | 用户可以扩展模式，匹配路径中的多条边。 | | |||
| | 匹配定长路径 | `MATCH p=(v:player{name:"Tim Duncan"})-[e:follow*2]->(v2) RETURN DISTINCT v2 AS Friends` | 用户可以在模式中使用`:<edge_type>*<hop>`匹配定长路径。`hop`必须是一个非负整数。`e`的数据类型是列表。 | | |||
| | 匹配变长路径 | `MATCH p=(v:player{name:"Tim Duncan"})-[e:follow*1..3]->(v2) RETURN v2 AS Friends` | `minHop`：可选项。表示路径的最小长度。`minHop`必须是一个非负整数，默认值为 1。<br>`maxHop`：必选项。表示路径的最大长度。`maxHop`必须是一个非负整数，没有默认值。`e`的数据类型是列表。 | | |||
| | 匹配变长路径 | `MATCH p=(v:player{name:"Tim Duncan"})-[e:follow*1..3]->(v2) RETURN v2 AS Friends` | `minHop`：可选项。表示路径的最小长度。`minHop`必须是一个非负整数，默认值为 1。<br>`maxHop`：可选项。表示路径的最大长度。`maxHop`必须是一个非负整数，默认为无穷大。`e`的数据类型是列表。 | | |||
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| !!! caution | ||
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| 如果未设置 `maxHop` 可能会导致 graph 服务 OOM，请谨慎执行该命令。 |
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| nebula> MATCH p=(v:player{name:"Tim Duncan"})-[e:follow*1..]->(v2) \ | ||
| RETURN v2 AS Friends; |
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如果用户没注意前面的caution，直接拿这个例子去改，可能会oom。所以我们是不是考虑不要放这个例子？
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