Don't convert PartialSqlString's into params

Author: mythz

src/ServiceStack.OrmLite.SqlServerTests/Expressions/EqualityExpressionsTest.cs

@@ -4,8 +4,6 @@ namespace ServiceStack.OrmLite.SqlServerTests.Expressions
 {
     public class EqualityExpressionsTest : ExpressionsTestBase
     {
-        #region int tests
-
         [Test]
         public void Can_select_equals_constant_int_expression()
         {
@@ -128,9 +126,6 @@ public void Can_select_not_equals_int_method_expression()
             CollectionAssert.DoesNotContain(actual, expected);
         }
 
-        #endregion
-
-        #region bool test
 
         [Test]
         public void Can_select_equals_constant_bool_expression()
@@ -306,6 +301,5 @@ public void Can_select_equals_coalesce_on_the_right_expression()
             CollectionAssert.Contains(actual, expected);       // this will fail as well
         }
 
-        #endregion
     }
 }

src/ServiceStack.OrmLite/Expressions/SqlExpression.cs

@@ -1364,7 +1364,10 @@ protected virtual void VisitFilter(string operand, object originalLeft, object o
             if (operand == "AND" || operand == "OR" || operand == "is" || operand == "is not")
                 return;
 
-            ConvertToPlaceholderAndParameter(ref right);
+            if (!(right is PartialSqlString))
+            {
+                ConvertToPlaceholderAndParameter(ref right);
+            }
         }
 
         protected virtual void ConvertToPlaceholderAndParameter(ref object right)