Using 1 projection when the column target and the column name are the same.

Author: WaVEV

django_mongodb/compiler.py

@@ -432,7 +432,11 @@ def get_project_fields(self, columns=None, ordering=None):
         for name, expr in columns or []:
             collection = expr.alias if isinstance(expr, Col) else None
             try:
-                fields[collection][name] = expr.as_mql(self, self.connection)
+                fields[collection][name] = (
+                    1
+                    if isinstance(expr, Col) and name == expr.target.column
+                    else expr.as_mql(self, self.connection)
+                )
             except EmptyResultSet:
                 fields[collection][name] = Value(False).as_mql(self, self.connection)
             except FullResultSet: