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Diffstat (limited to 'django/db/models/sql/compiler.py')
| -rw-r--r-- | django/db/models/sql/compiler.py | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/django/db/models/sql/compiler.py b/django/db/models/sql/compiler.py index 919e951fa2..e1a240dec3 100644 --- a/django/db/models/sql/compiler.py +++ b/django/db/models/sql/compiler.py @@ -358,11 +358,13 @@ class SQLCompiler: if ( field.nulls_first is None and field.nulls_last is None ) or self.connection.features.supports_order_by_nulls_modifier: + field = field.copy() field.expression = select_ref # Alias collisions are not possible when dealing with # combined queries so fallback to it if emulation of NULLS # handling is required. elif self.query.combinator: + field = field.copy() field.expression = Ref(select_ref.refs, select_ref.source) yield field, select_ref is not None continue |