add charset doc (vesoft-inc#1750)

Co-authored-by: dangleptr <[email protected]>

docs/manual-CN/2.query-language/4.statement-syntax/1.data-definition-statements/create-space-syntax.md

@@ -2,7 +2,7 @@
 
 ```ngql
 CREATE SPACE [IF NOT EXISTS] <space_name>
-   [(partition_num = <part_num>, replica_factor = <raft_copy>)]
+   [(partition_num = <part_num>, replica_factor = <raft_copy>, charset = <charset>, collate = <collate>)]
 ```
 
 以上语句用于创建一个新的图空间。不同的图空间是物理隔离的。
@@ -29,9 +29,13 @@ CREATE SPACE [IF NOT EXISTS] <space_name>
 
 * _replica_factor_
 
-    _replica_factor_ 表示副本数量。默认值是 1，集群建议为 3
+    _replica_factor_ 表示副本数量。默认值是 1，集群建议为 3。
+* _charset_
+    _charset_ 表示字符集，定义了字符以及字符的编码，默认为 utf8。
+* _collate_
+    _collate_ 表示字符序，定义了字符的比较规则，默认为 utf8_bin。
 
-如果没有自定义选项，**Nebula Graph** 会使用默认的值（partition_number 和 replica_factor）来创建图空间。
+如果没有自定义选项，**Nebula Graph** 会使用默认的值（partition_number、replica_factor、charset 和 collate）来创建图空间。
 
 ## 示例
 

docs/manual-CN/2.query-language/4.statement-syntax/3.utility-statements/show-syntax.md

@@ -3,15 +3,19 @@
 ```ngql
 SHOW {SPACES | TAGS | EDGES | HOSTS | PARTS }
 SHOW PARTS <part_id>
-SHOW CREATE {TAG | EDGE} {<tag_name> | <edge_name>}
+SHOW CREATE { SPACE | TAG | EDGE} {<space_name> | <tag_name> | <edge_name>}
 SHOW {TAG | EDGE} INDEXES
 SHOW CONFIGS [graph|meta|storage]
+SHOW SNAPSHOTS
+SHOW CHARSET
+SHOW COLLATION
 ```
 
 `SHOW SPACES` 列出 **Nebula Graph** 集群中的所有图空间。
 
 `SHOW TAGS` 和 `SHOW EDGES` 则返回当前图空间中被定义的 tag 和 edge type。
 
+`SHOW CREATE SPACE` 返回指定 space 及其创建语法。如果 space 包含默认值，则同时返回默认值。
 `SHOW CREATE TAG` 和 `SHOW CREATE EDGE` 返回当前图空间中指定的 tag、edge type 及其创建语法。如果 tag 或 edge type 包含默认值，则同时返回默认值。
 
 `SHOW INDEXES` 用于列出已创建完成的标签或边类型的索引信息。
@@ -24,6 +28,12 @@ SHOW CONFIGS [graph|meta|storage]
 
 更多关于 `SHOW CONFIGS [graph|meta|storage]` 的信息，参见 [configs syntax](../../../3.build-develop-and-administration/3.deploy-and-administrations/server-administration/configuration-statements/configs-syntax.md)。
 
+`SHOW SNAPSHOTS` 返回所有快照。
+
+`SHOW CHARSET` 返回所有支持的字符集。
+
+`SHOW COLLATION` 返回支持的排序规则。
+
 ## 示例
 
 ```ngql

docs/manual-EN/2.query-language/4.statement-syntax/1.data-definition-statements/create-space-syntax.md

@@ -2,7 +2,7 @@
 
 ```ngql
 CREATE SPACE [IF NOT EXISTS] <space_name>
-   [(partition_num = <part_num>, replica_factor = <raft_copy>)]
+   [(partition_num = <part_num>, replica_factor = <raft_copy>, charset = <charset>, collate = <collate>)]
 ```
 
 This statement creates a new space with the given name. SPACE is a region that provides physically isolated graphs in **Nebula Graph**. An error occurs if the database exists.
@@ -30,8 +30,12 @@ When creating a space, the following two customized options can be given:
 * _replica_factor_
 
     _replica_factor_ specifies the number of replicas in the cluster. The default replica factor is 1. The suggested number is 3 in cluster.
+* _charset_
+    _charset_ is short for character set. A character set is a set of symbols and encodings. The default value is utf8.
+* _collate_
+    A _collation_ is a set of rules for comparing characters in a character set. The default value is utf8_bin.
 
-However, if no option is given, **Nebula Graph** will create the space with the default partition number and replica factor.
+However, if no option is given, **Nebula Graph** will create the space with the default partition number, replica factor, charset and collate.
 
 ## Example
 

docs/manual-EN/2.query-language/4.statement-syntax/3.utility-statements/show-syntax.md

@@ -1,17 +1,22 @@
 # Show Syntax
 
 ```ngql
-SHOW {SPACES | TAGS | EDGES | HOSTS | PARTS}
+SHOW {SPACES | TAGS | EDGES | HOSTS | PARTS }
 SHOW PARTS <part_id>
-SHOW CREATE {TAG | EDGE} {<tag_name> | <edge_name>}
+SHOW CREATE { SPACE | TAG | EDGE} {<space_name> | <tag_name> | <edge_name>}
 SHOW {TAG | EDGE} INDEXES
 SHOW CONFIGS [graph|meta|storage]
+SHOW SNAPSHOTS
+SHOW CHARSET
+SHOW COLLATION
 ```
 
 `SHOW SPACES` lists the SPACES on the **Nebula Graph** cluster.
 
 `SHOW TAGS` and `SHOW EDGES` return the defined tags and edge types in a given space, respectively.
 
+`SHOW CREATE SPACE` returns the specified graph space and its creation syntax. If the graph space contains a default value, the default value is also returned.
+
 `SHOW CREATE TAG` and `SHOW CREATE EDGE` return the specified tag or edge type and their creation syntax in a given space. If the tag or edge type contains a default value, the default value is also returned.
 
 `SHOW INDEXES` returns the defined tag/edg-type index information.
@@ -24,6 +29,12 @@ SHOW CONFIGS [graph|meta|storage]
 
 For more information about `SHOW CONFIGS [graph|meta|storage]`, please refer to [configs syntax](../../../3.build-develop-and-administration/3.deploy-and-administrations/server-administration/configuration-statements/configs-syntax.md).
 
+`SHOW SNAPSHOTS` lists all the snapshots.
+
+`SHOW CHARSET` displays the available character sets.
+
+`SHOW COLLATION` lists the display collations for a character set.
+
 ## Example
 
 ```ngql