ValueFieldAccessorResolver: Getting value accessors re-arranged

Some types are more frequent to get accessor than others.
For example
- long, int and guid are frequent key values, entity version values so
  one of them will be in every query.
- boolean fields are probably also frequent type amont model fields
- DateTime/DateTimeOffset can be a time stamp for each row.
- Double and decimal values are about money/amout of something/etc, they
  are more important than some other types.

At the same time unsigned integers and Byte/SByte are, to me, used
less frequently.

It's a small optimization but difference between finding accessor on
first and last check is ~2.5x and we always had to make 5-6 checks before
reaching long which is, i believe, the most frequent key value type.

Author: alex-kulakov

Orm/Xtensive.Orm/Tuples/Packed/TupleLayout.cs

@@ -61,42 +61,42 @@ public static ValueFieldAccessor GetValue(Type probeType)
 
         ValueFieldAccessor ResolveByType(Type type)
         {
-          return ReferenceEquals(type, WellKnownTypes.Bool) ? BoolAccessor :
-            ReferenceEquals(type, WellKnownTypes.Byte) ? ByteAccessor :
-            ReferenceEquals(type, WellKnownTypes.SByte) ? SByteAccessor :
-            ReferenceEquals(type, WellKnownTypes.Int16) ? Int16Accessor :
-            ReferenceEquals(type, WellKnownTypes.UInt16) ? UInt16Accessor :
+          return ReferenceEquals(type, WellKnownTypes.Int64) ? Int64Accessor :
+            ReferenceEquals(type, WellKnownTypes.Guid) ? GuidAccessor :
             ReferenceEquals(type, WellKnownTypes.Int32) ? Int32Accessor :
-            ReferenceEquals(type, WellKnownTypes.UInt32) ? UInt32Accessor :
-            ReferenceEquals(type, WellKnownTypes.Int64) ? Int64Accessor :
-            ReferenceEquals(type, WellKnownTypes.UInt64) ? UInt64Accessor :
-            ReferenceEquals(type, WellKnownTypes.Single) ? SingleAccessor :
-            ReferenceEquals(type, WellKnownTypes.Double) ? DoubleAccessor :
+            ReferenceEquals(type, WellKnownTypes.Bool) ? BoolAccessor :
             ReferenceEquals(type, WellKnownTypes.DateTime) ? DateTimeAccessor :
             ReferenceEquals(type, WellKnownTypes.TimeSpan) ? TimeSpanAccessor :
+            ReferenceEquals(type, WellKnownTypes.Double) ? DoubleAccessor :
             ReferenceEquals(type, WellKnownTypes.Decimal) ? DecimalAccessor :
-            ReferenceEquals(type, WellKnownTypes.Guid) ? GuidAccessor :
-            ReferenceEquals(type, WellKnownTypes.DateTimeOffset) ? DateTimeOffsetAccessor : null;
+            ReferenceEquals(type, WellKnownTypes.Single) ? SingleAccessor :
+            ReferenceEquals(type, WellKnownTypes.DateTimeOffset) ? DateTimeOffsetAccessor :
+            ReferenceEquals(type, WellKnownTypes.Int16) ? Int16Accessor :
+            ReferenceEquals(type, WellKnownTypes.Byte) ? ByteAccessor :
+            ReferenceEquals(type, WellKnownTypes.SByte) ? SByteAccessor :
+            ReferenceEquals(type, WellKnownTypes.UInt16) ? UInt16Accessor :
+            ReferenceEquals(type, WellKnownTypes.UInt32) ? UInt32Accessor :
+            ReferenceEquals(type, WellKnownTypes.UInt64) ? UInt64Accessor : null;
         }
 
         ValueFieldAccessor ResolveByNullableType(Type type)
         {
           return ReferenceEquals(type, WellKnownTypes.NullableBool) ? BoolAccessor :
-            ReferenceEquals(type, WellKnownTypes.NullableByte) ? ByteAccessor :
-            ReferenceEquals(type, WellKnownTypes.NullableSByte) ? SByteAccessor :
-            ReferenceEquals(type, WellKnownTypes.NullableInt16) ? Int16Accessor :
-            ReferenceEquals(type, WellKnownTypes.NullableUInt16) ? UInt16Accessor :
             ReferenceEquals(type, WellKnownTypes.NullableInt32) ? Int32Accessor :
-            ReferenceEquals(type, WellKnownTypes.NullableUInt32) ? UInt32Accessor :
-            ReferenceEquals(type, WellKnownTypes.NullableInt64) ? Int64Accessor :
-            ReferenceEquals(type, WellKnownTypes.NullableUInt64) ? UInt64Accessor :
-            ReferenceEquals(type, WellKnownTypes.NullableSingle) ? SingleAccessor :
             ReferenceEquals(type, WellKnownTypes.NullableDouble) ? DoubleAccessor :
+            ReferenceEquals(type, WellKnownTypes.NullableDecimal) ? DecimalAccessor :
+            ReferenceEquals(type, WellKnownTypes.NullableInt64) ? Int64Accessor :
             ReferenceEquals(type, WellKnownTypes.NullableDateTime) ? DateTimeAccessor :
             ReferenceEquals(type, WellKnownTypes.NullableTimeSpan) ? TimeSpanAccessor :
-            ReferenceEquals(type, WellKnownTypes.NullableDecimal) ? DecimalAccessor :
-            ReferenceEquals(type, WellKnownTypes.NullableGuid) ? GuidAccessor :
-            ReferenceEquals(type, WellKnownTypes.NullableDateTimeOffset) ? DateTimeOffsetAccessor : null;
+            ReferenceEquals(type, WellKnownTypes.NullableDateTimeOffset) ? DateTimeOffsetAccessor :
+            ReferenceEquals(type, WellKnownTypes.NullableSingle) ? SingleAccessor :
+            ReferenceEquals(type, WellKnownTypes.NullableGuid) ? GuidAccessor : 
+            ReferenceEquals(type, WellKnownTypes.NullableInt16) ? Int16Accessor :
+            ReferenceEquals(type, WellKnownTypes.NullableByte) ? ByteAccessor :
+            ReferenceEquals(type, WellKnownTypes.NullableSByte) ? SByteAccessor :
+            ReferenceEquals(type, WellKnownTypes.NullableUInt16) ? UInt16Accessor :
+            ReferenceEquals(type, WellKnownTypes.NullableUInt32) ? UInt32Accessor :
+            ReferenceEquals(type, WellKnownTypes.NullableUInt64) ? UInt64Accessor : null;
         }
       }
     }