Support table comment and column comment for view (#1799)

docs/documentation/cn/sql-reference/sql-statements/Administration/SHOW FULL COLUMNS.md

@@ -0,0 +1,14 @@
+# SHOW FULL COLUMNS
+## description
+    该语句用于指定表的列信息
+    语法：
+        SHOW FULL COLUMNS FROM tbl;
+        
+## example
+    1. 查看指定表的列信息
+
+        SHOW FULL COLUMNS FROM tbl;
+        
+## keyword
+    
+    SHOW,TABLE,STATUS    

docs/documentation/cn/sql-reference/sql-statements/Administration/SHOW TABLE STATUS.md

@@ -0,0 +1,22 @@
+# SHOW TABLE STATUS
+## description
+    该语句用于查看 Table 的一些信息。
+    语法：
+        SHOW TABLE STATUS
+        [FROM db] [LIKE "pattern"]
+        
+    说明：
+        1. 该语句主要用于兼容 MySQL 语法，目前仅显示 Comment 等少量信息
+        
+## example
+    1. 查看当前数据库下所有表的信息
+
+        SHOW TABLE STATUS;
+        
+    2. 查看指定数据库下，名称包含 example 的表的信息
+    
+        SHOW TABLE STATUS FROM db LIKE "%example%";
+
+## keyword
+    
+    SHOW,TABLE,STATUS    

docs/documentation/cn/sql-reference/sql-statements/Data Definition/CREATE TABLE.md

@@ -6,10 +6,11 @@
         (column_definition1[, column_definition2, ...])
         [ENGINE = [olap|mysql|broker]]
         [key_desc]
+        [COMMENT "table comment"];
         [partition_desc]
         [distribution_desc]
-        [PROPERTIES ("key"="value", ...)];
-        [BROKER PROPERTIES ("key"="value", ...)];
+        [PROPERTIES ("key"="value", ...)]
+        [BROKER PROPERTIES ("key"="value", ...)]
         
     1. column_definition
         语法：
@@ -191,6 +192,7 @@
         )
         ENGINE=olap
         AGGREGATE KEY(k1, k2)
+        COMMENT "my first doris table"
         DISTRIBUTED BY HASH(k1) BUCKETS 32
         PROPERTIES ("storage_type"="column");
         

docs/documentation/cn/sql-reference/sql-statements/Data Definition/CREATE VIEW.md

@@ -3,7 +3,8 @@
     该语句用于创建一个逻辑视图
     语法：
         CREATE VIEW [IF NOT EXISTS]
-        [db_name.]view_name (column1[, column2, ...])
+        [db_name.]view_name
+        (column1[ COMMENT "col comment"][, column2, ...])
         AS query_stmt
         
     说明：
@@ -12,10 +13,25 @@
         
 ## example
     1. 在 example_db 上创建视图 example_view
+    
         CREATE VIEW example_db.example_view (k1, k2, k3, v1)
         AS
         SELECT c1 as k1, k2, k3, SUM(v1) FROM example_table
         WHERE k1 = 20160112 GROUP BY k1,k2,k3;
+        
+    2. 创建一个包含 comment 的 view
+    
+        CREATE VIEW example_db.example_view
+        (
+            k1 COMMENT "first key",
+            k2 COMMENT "second key",
+            k3 COMMENT "third key",
+            v1 COMMENT "first value"
+        )
+        COMMENT "my first view"
+        AS
+        SELECT c1 as k1, k2, k3, SUM(v1) FROM example_table
+        WHERE k1 = 20160112 GROUP BY k1,k2,k3;
     
 ## keyword
     CREATE,VIEW