Add exception when inner and outer selector parameters are the same

Author: alex-kulakov

Orm/Xtensive.Orm/Orm/Linq/Translator.Queryable.cs

@@ -1007,6 +1007,10 @@ private ProjectionExpression VisitJoin(Expression outerSource, Expression innerS
     {
       var outerParameter = outerKey.Parameters[0];
       var innerParameter = innerKey.Parameters[0];
+      if (innerParameter == outerParameter) {
+        throw new NotSupportedException(Strings.ExJoinHasSameInnerAndOuterParameterInstances);
+      }
+
       var outerSequence = VisitSequence(outerSource);
       var innerSequence = VisitSequence(innerSource);
       using (context.Bindings.Add(outerParameter, outerSequence))

Orm/Xtensive.Orm/Strings.Designer.cs

@@ -3476,4 +3476,7 @@ Error: {1}</value>
   <data name="ComparisonOfTwoEntityFieldsIsNotSupported" xml:space="preserve">
     <value>Comparison of two entity fields is not supported.</value>
   </data>
+  <data name="ExJoinHasSameInnerAndOuterParameterInstances" xml:space="preserve">
+    <value>Inner and outer selector expressions have the same parameter instance. Probably you use the same lambda expression for both selectors, which is currently not supported.</value>
+  </data>
 </root>