fix rdbms_db_summary (#1409)

Author: yyhhyyyyyy

dbgpt/rag/summary/rdbms_db_summary.py

@@ -1,5 +1,5 @@
 """Summary for rdbms database."""
-
+import re
 from typing import TYPE_CHECKING, List, Optional
 
 from dbgpt._private.config import Config
@@ -102,10 +102,20 @@ def _parse_table_summary(
             columns.append(f"{column['name']}")
 
     column_str = ", ".join(columns)
+    # Obtain index information
     index_keys = []
-    for index_key in conn.get_indexes(table_name):
-        key_str = ", ".join(index_key["column_names"])
-        index_keys.append(f"{index_key['name']}(`{key_str}`) ")  # noqa
+    raw_indexes = conn.get_indexes(table_name)
+    for index in raw_indexes:
+        if isinstance(index, tuple):  # Process tuple type index information
+            index_name, index_creation_command = index
+            # Extract column names using re
+            matched_columns = re.findall(r"\(([^)]+)\)", index_creation_command)
+            if matched_columns:
+                key_str = ", ".join(matched_columns)
+                index_keys.append(f"{index_name}(`{key_str}`) ")
+        else:
+            key_str = ", ".join(index["column_names"])
+            index_keys.append(f"{index['name']}(`{key_str}`) ")
     table_str = summary_template.format(table_name=table_name, columns=column_str)
     if len(index_keys) > 0:
         index_key_str = ", ".join(index_keys)