fix: clickhouse connect error fix (#958)

Co-authored-by: Magic <magic@B-4TMH9N3X-2120.local>
Co-authored-by: aries_ckt <916701291@qq.com>

dbgpt/datasource/base.py

@@ -3,7 +3,7 @@
 
 """We need to design a base class.  That other connector can Write with this"""
 from abc import ABC
-from typing import Iterable, List, Optional
+from typing import Iterable, List, Optional, Any, Dict
 
 
 class BaseConnect(ABC):
@@ -50,7 +50,7 @@ class BaseConnect(ABC):
         """Get database names."""
         pass
 
-    def get_table_comments(self, db_name):
+    def get_table_comments(self, db_name: str):
         """Get table comments.
 
         Args:
@@ -58,6 +58,33 @@ class BaseConnect(ABC):
         """
         pass
 
+    def get_table_comment(self, table_name: str) -> Dict:
+        """Get table comment.
+        Args:
+            table_name (str): table name
+        Returns:
+            comment: Dict, which contains text: Optional[str], eg:["text": "comment"]
+        """
+        pass
+
+    def get_columns(self, table_name: str) -> List[Dict]:
+        """Get columns.
+        Args:
+            table_name (str): table name
+        Returns:
+            columns: List[Dict], which contains name: str, type: str, default_expression: str, is_in_primary_key: bool, comment: str
+            eg:[{'name': 'id', 'type': 'int', 'default_expression': '', 'is_in_primary_key': True, 'comment': 'id'}, ...]
+        """
+        pass
+
+    def get_column_comments(self, db_name, table_name):
+        """Get column comments.
+
+        Args:
+            table_name (_type_): _description_
+        """
+        pass
+
     def run(self, command: str, fetch: str = "all") -> List:
         """Execute sql command.
 
@@ -99,8 +126,13 @@ class BaseConnect(ABC):
         """Get the creation table sql about specified table."""
         pass
 
-    def get_indexes(self, table_name):
-        """Get table indexes about specified table."""
+    def get_indexes(self, table_name: str) -> List[Dict]:
+        """Get table indexes about specified table.
+        Args:
+            table_name (str): table name
+        Returns:
+            indexes: List[Dict], eg:[{'name': 'idx_key', 'column_names': ['id']}]
+        """
         pass
 
     @classmethod