Merge DecimalCompareGenerator into CompareGenerator

Author: hazzik

src/NHibernate/Linq/Functions/CompareGenerator.cs

@@ -32,6 +32,8 @@ internal class CompareGenerator : BaseHqlGeneratorForMethod, IRuntimeMethodHqlGe
 
 				ReflectHelper.GetMethodDefinition<float>(x => x.CompareTo(x)),
 				ReflectHelper.GetMethodDefinition<double>(x => x.CompareTo(x)),
+				
+				ReflectHelper.GetMethodDefinition(() => decimal.Compare(default(decimal), default(decimal))),
 				ReflectHelper.GetMethodDefinition<decimal>(x => x.CompareTo(x)),
 
 				ReflectHelper.GetMethodDefinition<DateTime>(x => x.CompareTo(x)),

src/NHibernate/Linq/Functions/DecimalGenerator.cs

@@ -24,22 +24,6 @@ public override HqlTreeNode BuildHql(MethodInfo method, Expression targetObject,
 		}
 	}
 
-	public class DecimalCompareGenerator : BaseHqlGeneratorForMethod
-	{
-		public DecimalCompareGenerator()
-		{
-			SupportedMethods = new[]
-			{
-				ReflectHelper.GetMethodDefinition(() => decimal.Compare(default(decimal), default(decimal)))
-			};
-		}
-
-		public override HqlTreeNode BuildHql(MethodInfo method, Expression targetObject, ReadOnlyCollection<Expression> arguments, HqlTreeBuilder treeBuilder, IHqlExpressionVisitor visitor)
-		{
-			return treeBuilder.MethodCall("sign", treeBuilder.Subtract(visitor.Visit(arguments[0]).AsExpression(), visitor.Visit(arguments[1]).AsExpression()));
-		}
-	}
-
 	public class DecimalDivideGenerator : BaseHqlGeneratorForMethod
 	{
 		public DecimalDivideGenerator()

src/NHibernate/Linq/Functions/DefaultLinqToHqlGeneratorsRegistry.cs

@@ -53,7 +53,6 @@ public DefaultLinqToHqlGeneratorsRegistry()
 			this.Merge(new DateTimePropertiesHqlGenerator());
 
 			this.Merge(new DecimalAddGenerator());
-			this.Merge(new DecimalCompareGenerator());
 			this.Merge(new DecimalDivideGenerator());
 			this.Merge(new DecimalMultiplyGenerator());
 			this.Merge(new DecimalSubtractGenerator());