diff --git a/wren-ai-service/src/core/engine.py b/wren-ai-service/src/core/engine.py
index 8d54b36f43..b9fd975229 100644
--- a/wren-ai-service/src/core/engine.py
+++ b/wren-ai-service/src/core/engine.py
@@ -108,7 +108,6 @@ def is_sql_keyword(text: str) -> bool:
                 "TOP",
                 "WITH",
                 "RECURSIVE",
-                "CTE",
                 # Data types
                 "INTEGER",
                 "INT",
@@ -146,40 +145,12 @@ def is_sql_keyword(text: str) -> bool:
                 "CURRENT_DATE",
                 "CURRENT_TIME",
                 "CURRENT_TIMESTAMP",
-                "EXTRACT",
-                "DATE_TRUNC",
-                "DATE_PART",
-                # Aggregate functions (common ones)
-                "COUNT",
-                "SUM",
-                "AVG",
-                "MIN",
-                "MAX",
-                "STDDEV",
-                "VARIANCE",
-                # Window functions
-                "OVER",
-                "PARTITION",
-                "ROW_NUMBER",
-                "RANK",
-                "DENSE_RANK",
-                "LAG",
-                "LEAD",
-                "FIRST_VALUE",
-                "LAST_VALUE",
-                "NTILE",
                 # Other common keywords
                 "CASE",
                 "WHEN",
                 "THEN",
                 "ELSE",
                 "END",
-                "CAST",
-                "CONVERT",
-                "COALESCE",
-                "NULLIF",
-                "IFNULL",
-                "ISNULL",
                 "DESC",
                 "ASC",
                 "TRUE",