[doc] add create table statement for create-materialized-view doc (#10029)

docs/en/docs/sql-manual/sql-reference/Data-Definition-Statements/Create/CREATE-MATERIALIZED-VIEW.md

@@ -102,6 +102,18 @@ mysql> desc duplicate_table;
 | k4 | BIGINT | Yes | true | N/A | |
 +-------+--------+------+------+---------+-------+
 ````
+```sql
+create table duplicate_table(
+	k1 int null,
+	k2 int null,
+	k3 bigint null,
+	k4 bigint null
+)
+duplicate key (k1,k2,k3,k4)
+distributed BY hash(k4) buckets 3
+properties("replication_num" = "1");
+```
+attention：The partition and distributed columns  must be key column in mv
 
 1. Create a materialized view that contains only the columns of the original table (k1, k2)
 

docs/zh-CN/docs/sql-manual/sql-reference/Data-Definition-Statements/Create/CREATE-MATERIALIZED-VIEW.md

@@ -102,6 +102,18 @@ mysql> desc duplicate_table;
 | k4    | BIGINT | Yes  | true | N/A     |       |
 +-------+--------+------+------+---------+-------+
 ```
+```sql
+create table duplicate_table(
+	k1 int null,
+	k2 int null,
+	k3 bigint null,
+	k4 bigint null
+)
+duplicate key (k1,k2,k3,k4)
+distributed BY hash(k4) buckets 3
+properties("replication_num" = "1");
+```
+注意：分区列和分桶列必须作为物化视图中的key列
 
 1. 创建一个仅包含原始表 （k1, k2）列的物化视图