diff options
Diffstat (limited to 'lib')
| -rw-r--r-- | lib/sqlalchemy/orm/query.py | 9 |
1 files changed, 8 insertions, 1 deletions
diff --git a/lib/sqlalchemy/orm/query.py b/lib/sqlalchemy/orm/query.py index 0f5b8bf88..afcbf3500 100644 --- a/lib/sqlalchemy/orm/query.py +++ b/lib/sqlalchemy/orm/query.py @@ -2543,7 +2543,14 @@ class Query(object): .. versionadded:: 0.8.1 """ - return sql.exists(self.with_labels().statement.with_only_columns(['1'])) + + # .add_columns() for the case that we are a query().select_from(X), + # so that ".statement" can be produced (#2995) but also without + # omitting the FROM clause from a query(X) (#2818); + # .with_only_columns() after we have a core select() so that + # we get just "SELECT 1" without any entities. + return sql.exists(self.add_columns('1').with_labels(). + statement.with_only_columns(['1'])) def count(self): """Return a count of rows this Query would return. |