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support s2 index params #1381

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Jan 12, 2022
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support s2 index params #1381

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9a6042f
support s2 index params
cooper-lzy Jan 12, 2022
3440322
update
cooper-lzy Jan 12, 2022
97c1484
Update docs-2.0/3.ngql-guide/3.data-types/10.geography.md
randomJoe211 Jan 12, 2022
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17 changes: 17 additions & 0 deletions docs-2.0/3.ngql-guide/3.data-types/10.geography.md
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Original file line number Diff line number Diff line change
Expand Up @@ -73,4 +73,21 @@ nebula> LOOKUP ON any_shape YIELD ST_ASText(any_shape.geo);
+----------+-------------------------------------------------+
| "103" | "POLYGON((0 1, 1 2, 2 3, 0 1))" |
+----------+-------------------------------------------------+
```

为 geo 属性创建索引时，还可以指定 geo 索引的参数。说明如下。

<!--https://www.cockroachlabs.com/docs/stable/spatial-indexes.html-->

|参数|默认值|说明|
|:---|:--|:---|
|`s2_max_level` |`30`| S2 cell 用于填充的最大等级。取值：`1`~`30`。设置为小于默认值时，意味着会使用较大的单元格进行填充。 |
|`s2_max_cells` |`8`|S2 cell 用于填充的最大数量，可以限制填充时的工作量。取值：`1`~`30`。对于复杂形状的区域（例如细矩形），可以使用更大的值。 |

!!! note

指定如上两个参数对 Point 类型属性没有影响，Point 类型属性的`s2_max_level`强制为`30`。

```ngql
nebula> CREATE TAG INDEX IF NOT EXISTS any_shape_geo_index ON any_shape(geo) with (s2_max_level=30, s2_max_cells=8);
```