fix: Make cte_alias a property of db engine spec (#22947)

superset/db_engine_specs/base.py

@@ -86,9 +86,6 @@ ColumnTypeMapping = Tuple[
 logger = logging.getLogger()
 
 
-CTE_ALIAS = "__cte"
-
-
 class TimeGrain(NamedTuple):
     name: str  # TODO: redundant field, remove
     label: str
@@ -346,6 +343,8 @@ class BaseEngineSpec:  # pylint: disable=too-many-public-methods
     # If True, then it will allow  in subquery ,
     # if False it will allow as regular CTE
     allows_cte_in_subquery = True
+    # Define alias for CTE
+    cte_alias = "__cte"
     # Whether allow LIMIT clause in the SQL
     # If True, then the database engine is allowed for LIMIT clause
     # If False, then the database engine is allowed for TOP clause
@@ -889,7 +888,7 @@ class BaseEngineSpec:  # pylint: disable=too-many-public-methods
 
             # extract rest of the SQLs after CTE
             remainder = "".join(str(token) for token in stmt.tokens[idx:]).strip()
-            return f"WITH {token.value},\n{CTE_ALIAS} AS (\n{remainder}\n)"
+            return f"WITH {token.value},\n{cls.cte_alias} AS (\n{remainder}\n)"
 
         return None