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-rw-r--r--django/db/models/sql/query.py2
1 files changed, 1 insertions, 1 deletions
diff --git a/django/db/models/sql/query.py b/django/db/models/sql/query.py
index 1258eb61a9..39a735b50e 100644
--- a/django/db/models/sql/query.py
+++ b/django/db/models/sql/query.py
@@ -1692,7 +1692,7 @@ class Query(BaseExpression):
yield expr
elif include_external and callable(getattr(expr, 'get_external_cols', None)):
yield from expr.get_external_cols()
- else:
+ elif hasattr(expr, 'get_source_expressions'):
yield from cls._gen_cols(
expr.get_source_expressions(),
include_external=include_external,