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-rw-r--r--lib/sqlalchemy/sql/roles.py10
1 files changed, 9 insertions, 1 deletions
diff --git a/lib/sqlalchemy/sql/roles.py b/lib/sqlalchemy/sql/roles.py
index 053bd7146..55c52d401 100644
--- a/lib/sqlalchemy/sql/roles.py
+++ b/lib/sqlalchemy/sql/roles.py
@@ -95,6 +95,8 @@ class InElementRole(SQLRole):
class FromClauseRole(ColumnsClauseRole):
_role_name = "FROM expression, such as a Table or alias() object"
+ _is_subquery = False
+
@property
def _hide_froms(self):
raise NotImplementedError()
@@ -134,7 +136,7 @@ class StatementRole(CoerceTextStatementRole):
class ReturnsRowsRole(StatementRole):
_role_name = (
- "Row returning expression such as a SELECT, or an "
+ "Row returning expression such as a SELECT, a FROM clause, or an "
"INSERT/UPDATE/DELETE with RETURNING"
)
@@ -142,6 +144,12 @@ class ReturnsRowsRole(StatementRole):
class SelectStatementRole(ReturnsRowsRole):
_role_name = "SELECT construct or equivalent text() construct"
+ def subquery(self):
+ raise NotImplementedError(
+ "All SelectStatementRole objects should implement a "
+ ".subquery() method."
+ )
+
class HasCTERole(ReturnsRowsRole):
pass