https://github.com/markrendle/Simple.Data/issues/379

Simple.Data.InMemoryTest/InMemoryTests.cs

@@ -834,5 +834,22 @@ public void UpdateWithOriginalValuesRowsUpdatedShouldBeZeroIfNewValueAreSameAsOr
 
             Assert.AreEqual(0, rowsUpdated);
         }
+
+        [Test]
+        public void FindAll_When2ColumnsAreCompared_ReturnsMatchingRows()
+        {
+            Database.UseMockAdapter(new InMemoryAdapter());
+            var db = Database.Open();
+            db.Translations.Insert(
+                Text: "some text",
+                Language: "pl",
+                OriginalLanguage: "pl"
+            );
+
+            var result = db.Translations
+                .FindAll(db.Translations.Language == db.Translations.OriginalLanguage);
+
+            Assert.AreEqual(1, result.Count());
+        }
     }
 }

Simple.Data.TestHelper/packages.config

@@ -1,5 +1,4 @@
 <?xml version="1.0" encoding="utf-8"?>
 <packages>
-  <package id="NUnit" version="2.5.9.10348" />
   <package id="NUnit" version="2.5.10.11092" />
 </packages>

Simple.Data/QueryPolyfills/WhereClauseHandler.cs

@@ -110,6 +110,16 @@ private Func<IDictionary<string, object>, bool> EqualExpressionToWhereClause(Sim
                         };
             }
 
+            if (arg.RightOperand.GetType() == typeof(ObjectReference))
+            {
+                return d => {
+                    var leftOperandResolved = Resolve(d, arg.LeftOperand);
+                    var rightOperandResolved = Resolve(d, arg.RightOperand);
+
+                    return Enumerable.SequenceEqual(leftOperandResolved, rightOperandResolved);
+                };
+            }
+
             return d => Resolve(d, arg.LeftOperand).Contains(arg.RightOperand);
         }