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add go format #1064

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Oct 18, 2021
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add go format #1064

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56c284b
add go format
cooper-lzy Oct 15, 2021
8742159
Update 3.go.md
cooper-lzy Oct 18, 2021
54abe67
Update 3.go.md
cooper-lzy Oct 18, 2021
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2 changes: 2 additions & 0 deletions docs-2.0/3.ngql-guide/6.functions-and-expressions/4.schema.md
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Expand Up @@ -13,6 +13,8 @@ Nebula Graph支持以下Schema函数。
|list labels(vertex) | 返回点的Tag，与tags()作用相同，用于兼容openCypher语法。|
|map properties(vertex_or_edge) | 接收点或边并返回其属性。|
|string type(edge) | 返回边的Edge type。|
|src(edge)|返回边的起始点ID。数据类型和点ID的类型保持一致。|
|dst(edge)|返回边的目的点ID。数据类型和点ID的类型保持一致。|
|vertex startNode(path) | 获取一条边或一条路径并返回它的起始点ID。|
|string endNode(path) | 获取一条边或一条路径并返回它的目的点ID。|
|int rank(edge) | 返回边的rank。|
Expand Down
67 changes: 32 additions & 35 deletions docs-2.0/3.ngql-guide/7.general-query-statements/3.go.md
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Expand Up @@ -13,14 +13,10 @@ GO [[<M> TO] <N> STEPS ] FROM <vertex_list>
OVER <edge_type_list> [{REVERSELY | BIDIRECT}]
[ WHERE <conditions> ]
[YIELD [DISTINCT] <return_list>]
[| GROUP BY {col_name | expr | position} YIELD <col_name>]
[| ORDER BY <expression> [{ASC | DESC}]]
[| LIMIT [<offset_value>,] <number_rows>]

GO [[<M> TO] <N> STEPS ] FROM <vertex_list>
OVER <edge_type_list> [{REVERSELY | BIDIRECT}]
[ WHERE <conditions> ]
[| GROUP BY {col_name | expr | position} YIELD <col_name>]

<vertex_list> ::=
<vid> [, <vid> ...]

Expand Down Expand Up @@ -52,7 +48,9 @@ OVER <edge_type_list> [{REVERSELY | BIDIRECT}]

遍历多个Edge type时，`WHERE`子句有一些限制。例如不支持`WHERE edge1.prop1 > edge2.prop2`。

- `YIELD [DISTINCT] <return_list>`：指定输出结果。详情请参见[YIELD](../8.clauses-and-options/yield.md)。如果没有指定，默认返回目的点ID。
- `YIELD [DISTINCT] <return_list>`：定义需要返回的输出。` <return_list>`建议使用[Schema函数](../6.functions-and-expressions/4.schema.md)，当前支持`src(edge)`、`dst(edge)`、`type(edge)`、`rank(edge)`、`properties(edge)`、`id(vertex)`、`properties(vertex)`。详情请参见[YIELD](../8.clauses-and-options/yield.md)。如果没有指定，默认返回目的点ID。

- `GROUP BY`：根据指定属性的值将输出分组。详情请参见[GROUP BY](../8.clauses-and-options/group-by.md)。分组后需要再次使用`YIELD`定义需要返回的输出。

- `ORDER BY`：指定输出结果的排序规则。详情请参见[ORDER BY](../8.clauses-and-options/order-by.md)。

Expand All @@ -62,8 +60,6 @@ OVER <edge_type_list> [{REVERSELY | BIDIRECT}]

- `LIMIT`：限制输出结果的行数。详情请参见[LIMIT](../8.clauses-and-options/limit.md)。

- `GROUP BY`：根据指定属性的值将输出分组。详情请参见[GROUP BY](../8.clauses-and-options/group-by.md)。

## 示例

```ngql
Expand Down Expand Up @@ -94,8 +90,9 @@ nebula> GO 2 STEPS FROM "player102" OVER follow;
```ngql
# 添加过滤条件。
nebula> GO FROM "player100", "player102" OVER serve \
WHERE serve.start_year > 1995 \
YIELD DISTINCT $$.team.name AS team_name, serve.start_year AS start_year, $^.player.name AS player_name;
WHERE properties(edge).start_year > 1995 \
YIELD DISTINCT properties($$).name AS team_name, properties(edge).start_year AS start_year, properties($^).name AS player_name;

+-----------------+------------+---------------------+
| team_name | start_year | player_name |
+-----------------+------------+---------------------+
Expand All @@ -108,24 +105,24 @@ nebula> GO FROM "player100", "player102" OVER serve \
```

```ngql
# 遍历多个Edge type。属性没有值时，会显示__EMPTY__。
# 遍历多个Edge type。属性没有值时，会显示UNKNOWN_PROP。
nebula> GO FROM "player100" OVER follow, serve \
YIELD follow.degree, serve.start_year;
+---------------+------------------+
| follow.degree | serve.start_year |
+---------------+------------------+
| 95 | __EMPTY__ |
+---------------+------------------+
| 95 | __EMPTY__ |
+---------------+------------------+
| __EMPTY__ | 1997 |
+---------------+------------------+
YIELD properties(edge).degree, properties(edge).start_year;
+-------------------------+-----------------------------+
| properties(EDGE).degree | properties(EDGE).start_year |
+-------------------------+-----------------------------+
| 95 | UNKNOWN_PROP |
+-------------------------+-----------------------------+
| 95 | UNKNOWN_PROP |
+-------------------------+-----------------------------+
| UNKNOWN_PROP | 1997 |
+-------------------------+-----------------------------+
```

```ngql
# 返回player100入方向的邻居点。
nebula> GO FROM "player100" OVER follow REVERSELY \
YIELD follow._dst AS destination;
YIELD src(edge) AS destination;
+-------------+
| destination |
+-------------+
Expand All @@ -151,16 +148,16 @@ nebula> MATCH (v)<-[e:follow]- (v2) WHERE id(v) == 'player100' \
```ngql
# 查询player100的朋友和朋友所属队伍。
nebula> GO FROM "player100" OVER follow REVERSELY \
YIELD follow._dst AS id | \
YIELD src(edge) AS id | \
GO FROM $-.id OVER serve \
WHERE $^.player.age > 20 \
YIELD $^.player.name AS FriendOf, $$.team.name AS Team;
WHERE properties($^).age > 20 \
YIELD properties($^).name AS FriendOf, properties($$).name AS Team;
+---------------------+-----------------+
| FriendOf | Team |
+---------------------+-----------------+
| "Tony Parker" | "Spurs" |
| "Danny Green" | "Spurs" |
+---------------------+-----------------+
| "Tony Parker" | "Hornets" |
| "Danny Green" | "Cavaliers" |
+---------------------+-----------------+
...

Expand All @@ -180,8 +177,8 @@ nebula> MATCH (v)<-[e:follow]- (v2)-[e2:serve]->(v3) \

```ngql
# 返回player102所有邻居点。
nebula> GO FROM "player102" OVER follow BIDIRECT \
YIELD follow._dst AS both;
nebula> GO FROM "player102" OVER follow \
YIELD dst(edge) AS both;
+-------------+
| both |
+-------------+
Expand All @@ -208,7 +205,7 @@ nebula> MATCH (v) -[e:follow]-(v2) \
```ngql
# 查询player100 1~2跳内的朋友。
nebula> GO 1 TO 2 STEPS FROM "player100" OVER follow \
YIELD follow._dst AS destination;
YIELD dst(edge) AS destination;
+-------------+
| destination |
+-------------+
Expand All @@ -234,9 +231,9 @@ nebula> MATCH (v) -[e:follow*1..2]->(v2) \
```ngql
# 根据年龄分组。
nebula> GO 2 STEPS FROM "player100" OVER follow \
YIELD follow._src AS src, follow._dst AS dst, $$.player.age AS age \
YIELD src(edge) AS src, dst(edge) AS dst, properties($$).age AS age \
| GROUP BY $-.dst \
YIELD $-.dst AS dst, collect_set($-.src) AS src, collect($-.age) AS age
YIELD $-.dst AS dst, collect_set($-.src) AS src, collect($-.age) AS age;
+-------------+----------------------------+----------+
| dst | src | age |
+-------------+----------------------------+----------+
Expand All @@ -250,9 +247,9 @@ nebula> GO 2 STEPS FROM "player100" OVER follow \

```ngql
# 分组并限制输出结果的行数。
nebula> $a = GO FROM "player100" OVER follow YIELD follow._src AS src, follow._dst AS dst; \
nebula> $a = GO FROM "player100" OVER follow YIELD src(edge) AS src, dst(edge) AS dst; \
GO 2 STEPS FROM $a.dst OVER follow \
YIELD $a.src AS src, $a.dst, follow._src, follow._dst \
YIELD $a.src AS src, $a.dst, src(edge), dst(edge) \
| ORDER BY $-.src | OFFSET 1 LIMIT 2;
+-------------+-------------+-------------+-------------+
| src | $a.dst | follow._src | follow._dst |
Expand All @@ -265,7 +262,7 @@ nebula> $a = GO FROM "player100" OVER follow YIELD follow._src AS src, follow._d

```ngql
# 在多个边上通过IS NOT EMPTY进行判断。
nebula> GO FROM "player100" OVER * WHERE $$.player.name IS NOT EMPTY YIELD follow._dst;
nebula> GO FROM "player100" OVER follow WHERE properties($$).name IS NOT EMPTY YIELD dst(edge);
+-------------+
| follow._dst |
+-------------+
Expand Down
18 changes: 9 additions & 9 deletions docs-2.0/3.ngql-guide/8.clauses-and-options/yield.md
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Expand Up @@ -24,7 +24,7 @@

!!! note
下文示例中的`$$`、`$-`等是引用符号，详情请参见[引用符](../5.operators/5.property-reference.md)。

## YIELD子句

### 语法
Expand All @@ -45,7 +45,7 @@ YIELD [DISTINCT] <col> [AS <alias>] [, <col> [AS <alias>] ...];

```ngql
nebula> GO FROM "player100" OVER follow \
YIELD $$.player.name AS Friend, $$.player.age AS Age;
YIELD properties($$).name AS Friend, properties($$).age AS Age;
+-----------------+-----+
| Friend | Age |
+-----------------+-----+
Expand All @@ -72,11 +72,11 @@ YIELD [DISTINCT] <col> [AS <alias>] [, <col> [AS <alias>] ...];
```ngql
nebula> LOOKUP ON player WHERE player.name == "Tony Parker" \
YIELD player.name, player.age;
=======================================
| VertexID | player.name | player.age |
=======================================
| 101 | Tony Parker | 36 |
---------------------------------------
+-------------+---------------+------------+
| VertexID | player.name | player.age |
+-------------+---------------+------------+
| "player101" | "Tony Parker" | 36 |
+-------------+---------------+------------+
```

## YIELD语句
Expand All @@ -102,7 +102,7 @@ YIELD [DISTINCT] <col> [AS <alias>] [, <col> [AS <alias>] ...]
```ngql
# 查找player100关注的player，并计算他们的平均年龄。
nebula> GO FROM "player100" OVER follow \
YIELD follow._dst AS ID \
YIELD dst(edge) AS ID \
| FETCH PROP ON player $-.ID \
YIELD player.age AS Age \
| YIELD AVG($-.Age) as Avg_age, count(*)as Num_friends;
Expand All @@ -116,7 +116,7 @@ nebula> GO FROM "player100" OVER follow \
```ngql
# 查找player101关注的player，返回degree大于90的player。
nebula> $var1 = GO FROM "player101" OVER follow \
YIELD follow.degree AS Degree, follow._dst as ID; \
YIELD properties(edge).degree AS Degree, dst(edge) as ID; \
YIELD $var1.ID AS ID WHERE $var1.Degree > 90;
+-------------+
| ID |
Expand Down