解决表名大写时SQL优化解析表信息失败的问题 fix #843

sql/utils/extract_tables.py

@@ -128,7 +128,7 @@ def parse_identifier(item):
         if name and not name_quoted and not name.islower():
             if not alias:
                 alias = name
-            name = name.lower()
+            # name = name.lower()
         return schema_name, name, alias
 
     for item in token_stream: