Fix decimal equality comparison for Sqlite

Author: maca88

src/NHibernate.Test/Async/Linq/OperatorTests.cs

@@ -35,6 +35,20 @@ public async Task UnaryMinusAsync()
 			Assert.AreEqual(1, await (session.Query<TimesheetEntry>().CountAsync(a => -a.NumberOfHours == -7)));
 		}
 
+		[Test]
+		public async Task DecimalAddAsync()
+		{
+			decimal offset = 5.5m;
+			decimal test = 10248 + offset;
+			var result = await (session.Query<Order>().Where(e => offset + e.OrderId == test).ToListAsync());
+			Assert.That(result, Has.Count.EqualTo(1));
+
+			offset = 5.5m;
+			test = 32.38m + offset;
+			result = await (session.Query<Order>().Where(e => offset + e.Freight == test).ToListAsync());
+			Assert.That(result, Has.Count.EqualTo(1));
+		}
+
 		[Test]
 		public async Task UnaryPlusAsync()
 		{

src/NHibernate.Test/Linq/OperatorTests.cs

@@ -24,6 +24,20 @@ public void UnaryMinus()
 			Assert.AreEqual(1, session.Query<TimesheetEntry>().Count(a => -a.NumberOfHours == -7));
 		}
 
+		[Test]
+		public void DecimalAdd()
+		{
+			decimal offset = 5.5m;
+			decimal test = 10248 + offset;
+			var result = session.Query<Order>().Where(e => offset + e.OrderId == test).ToList();
+			Assert.That(result, Has.Count.EqualTo(1));
+
+			offset = 5.5m;
+			test = 32.38m + offset;
+			result = session.Query<Order>().Where(e => offset + e.Freight == test).ToList();
+			Assert.That(result, Has.Count.EqualTo(1));
+		}
+
 		[Test]
 		public void UnaryPlus()
 		{

src/NHibernate/Linq/Visitors/HqlGeneratorExpressionVisitor.cs

@@ -579,8 +579,11 @@ protected HqlTreeNode VisitConstantExpression(ConstantExpression expression)
 			if (_parameters.ConstantToParameterMap.TryGetValue(expression, out namedParameter))
 			{
 				_parameters.RequiredHqlParameters.Add(new NamedParameterDescriptor(namedParameter.Name, null, false));
+				var parameter = _hqlTreeBuilder.Parameter(namedParameter.Name).AsExpression();
 
-				return _hqlTreeBuilder.Parameter(namedParameter.Name).AsExpression();
+				return HqlIdent.SupportsType(expression.Type)
+					? _hqlTreeBuilder.TransparentCast(parameter, expression.Type)
+					: parameter;
 			}
 
 			return _hqlTreeBuilder.Constant(expression.Value);