[to #50700687] fix format of SHOW CREATE PROCEDURE/FUNCTION and DBMS_METADATA.GET_DDL

src/sql/session/ob_basic_session_info.h

@@ -2416,7 +2416,7 @@ public:
   int load(ObBasicSessionInfo &session, ObIAllocator *alloc = NULL);
   int store(ObBasicSessionInfo &session);
 
-  ObSQLMode get_sql_mode() { return sql_mode_; }
+  ObSQLMode get_sql_mode() const { return sql_mode_; }
   ObCharsetType get_charset_client() { return ObCharset::charset_type_by_coll(charset_client_); }
   ObCollationType get_collation_connection() { return collation_connection_; }
   ObCollationType get_collation_database() { return collation_database_; }