--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/Source/Data/Linq/Builder/DistinctBuilder.cs	Thu Mar 27 21:46:09 2014 +0400
@@ -0,0 +1,35 @@
+using System;
+using System.Linq.Expressions;
+
+namespace BLToolkit.Data.Linq.Builder
+{
+	using BLToolkit.Linq;
+
+	class DistinctBuilder : MethodCallBuilder
+	{
+		protected override bool CanBuildMethodCall(ExpressionBuilder builder, MethodCallExpression methodCall, BuildInfo buildInfo)
+		{
+			return methodCall.IsQueryable("Distinct");
+		}
+
+		protected override IBuildContext BuildMethodCall(ExpressionBuilder builder, MethodCallExpression methodCall, BuildInfo buildInfo)
+		{
+			var sequence = builder.BuildSequence(new BuildInfo(buildInfo, methodCall.Arguments[0]));
+			var sql      = sequence.SqlQuery;
+
+			if (sql.Select.TakeValue != null || sql.Select.SkipValue != null)
+				sequence = new SubQueryContext(sequence);
+
+			sequence.SqlQuery.Select.IsDistinct = true;
+			sequence.ConvertToIndex(null, 0, ConvertFlags.All);
+
+			return sequence;
+		}
+
+		protected override SequenceConvertInfo Convert(
+			ExpressionBuilder builder, MethodCallExpression methodCall, BuildInfo buildInfo, ParameterExpression param)
+		{
+			return null;
+		}
+	}
+}