Improve generated identifiers normalization

Tests/Linq/Linq/IdentifierTests.cs

@@ -0,0 +1,57 @@
+using System.Linq;
+using LinqToDB;
+using LinqToDB.Mapping;
+using NUnit.Framework;
+
+namespace Tests.Linq
+{
+	/*
+	 * 1. we use identifiers as base name for alias/parameter
+	 * 2. .NET metadata limits identifier length to 1023 bytes in UTF-8
+	 * 1+2 means => there is no reason for us to test longer names for now till users find a way to generate even longer names :)
+	 * 3. we test both latin and non-latin based names as db behavior could differ for them
+	 * 4. extended plane characters (surrogate pairs) not tested as Roslyn currently cannot handle them in idetifiers despite being allowed by language spec
+	 * https://github.com/dotnet/roslyn/issues/13474 and referenced issues
+	 */
+	[TestFixture]
+	public class IdentifierTests : TestBase
+	{
+		[Test]
+		public void TestParameterLengthName_Latin([DataSources] string context)
+		{
+			var  abcdefghijabcdefghijabcdefghijabcdefghijabcdefghijabcdefghijabcdefghijabcdefghijabcdefghijabcdefghijabcdefghijabcdefghijabcdefghijabcdefghijabcdefghijabcdefghijabcdefghijabcdefghijabcdefghijabcdefghijabcdefghijabcdefghijabcdefghijabcdefghijabcdefghijabcdefghijabcdefghijabcdefghijabcdefghijabcdefghijabcdefghijabcdefghijabcdefghijabcdefghijabcdefghijabcdefghijabcdefghijabcdefghijabcdefghijabcdefghijabcdefghijabcdefghijabcdefghijabcdefghijabcdefghijabcdefghijabcdefghijabcdefghijabcdefghijabcdefghijabcdefghijabcdefghijabcdefghijabcdefghijabcdefghijabcdefghijabcdefghijabcdefghijabcdefghijabcdefghijabcdefghijabcdefghijabcdefghijabcdefghijabcdefghijabcdefghijabcdefghijabcdefghijabcdefghijabcdefghijabcdefghijabcdefghijabcdefghijabcdefghijabcdefghijabcdefghijabcdefghijabcdefghijabcdefghijabcdefghijabcdefghijabcdefghijabcdefghijabcdefghijabcdefghijabcdefghijabcdefghijabcdefghijabcdefghijabcdefghijabcdefghijabcdefghijabcdefghijabcdefghijabcdefghijabcdefghijabcdefghijabcdefghijabcdefghijabcdefghijabcdefghijabcdefghijabc = 1;
+			using var db = GetDataContext(context);
+			db.Person
+				.Where(r => r.ID == abcdefghijabcdefghijabcdefghijabcdefghijabcdefghijabcdefghijabcdefghijabcdefghijabcdefghijabcdefghijabcdefghijabcdefghijabcdefghijabcdefghijabcdefghijabcdefghijabcdefghijabcdefghijabcdefghijabcdefghijabcdefghijabcdefghijabcdefghijabcdefghijabcdefghijabcdefghijabcdefghijabcdefghijabcdefghijabcdefghijabcdefghijabcdefghijabcdefghijabcdefghijabcdefghijabcdefghijabcdefghijabcdefghijabcdefghijabcdefghijabcdefghijabcdefghijabcdefghijabcdefghijabcdefghijabcdefghijabcdefghijabcdefghijabcdefghijabcdefghijabcdefghijabcdefghijabcdefghijabcdefghijabcdefghijabcdefghijabcdefghijabcdefghijabcdefghijabcdefghijabcdefghijabcdefghijabcdefghijabcdefghijabcdefghijabcdefghijabcdefghijabcdefghijabcdefghijabcdefghijabcdefghijabcdefghijabcdefghijabcdefghijabcdefghijabcdefghijabcdefghijabcdefghijabcdefghijabcdefghijabcdefghijabcdefghijabcdefghijabcdefghijabcdefghijabcdefghijabcdefghijabcdefghijabcdefghijabcdefghijabcdefghijabcdefghijabcdefghijabcdefghijabcdefghijabcdefghijabcdefghijabcdefghijabcdefghijabcdefghijabcdefghijabcdefghijabc)
+				.ToArray();
+		}
+
+		[Test]
+		public void TestAliasLengthName_Latin([DataSources] string context)
+		{
+			using var db = GetDataContext(context);
+			db.Person
+				.Where(abcdefghijabcdefghijabcdefghijabcdefghijabcdefghijabcdefghijabcdefghijabcdefghijabcdefghijabcdefghijabcdefghijabcdefghijabcdefghijabcdefghijabcdefghijabcdefghijabcdefghijabcdefghijabcdefghijabcdefghijabcdefghijabcdefghijabcdefghijabcdefghijabcdefghijabcdefghijabcdefghijabcdefghijabcdefghijabcdefghijabcdefghijabcdefghijabcdefghijabcdefghijabcdefghijabcdefghijabcdefghijabcdefghijabcdefghijabcdefghijabcdefghijabcdefghijabcdefghijabcdefghijabcdefghijabcdefghijabcdefghijabcdefghijabcdefghijabcdefghijabcdefghijabcdefghijabcdefghijabcdefghijabcdefghijabcdefghijabcdefghijabcdefghijabcdefghijabcdefghijabcdefghijabcdefghijabcdefghijabcdefghijabcdefghijabcdefghijabcdefghijabcdefghijabcdefghijabcdefghijabcdefghijabcdefghijabcdefghijabcdefghijabcdefghijabcdefghijabcdefghijabcdefghijabcdefghijabcdefghijabcdefghijabcdefghijabcdefghijabcdefghijabcdefghijabcdefghijabcdefghijabcdefghijabcdefghijabcdefghijabcdefghijabcdefghijabcdefghijabcdefghijabcdefghijabcdefghijabcdefghijabcdefghijabcdefghijabcdefghijabcdefghijabcdefghijabc => abcdefghijabcdefghijabcdefghijabcdefghijabcdefghijabcdefghijabcdefghijabcdefghijabcdefghijabcdefghijabcdefghijabcdefghijabcdefghijabcdefghijabcdefghijabcdefghijabcdefghijabcdefghijabcdefghijabcdefghijabcdefghijabcdefghijabcdefghijabcdefghijabcdefghijabcdefghijabcdefghijabcdefghijabcdefghijabcdefghijabcdefghijabcdefghijabcdefghijabcdefghijabcdefghijabcdefghijabcdefghijabcdefghijabcdefghijabcdefghijabcdefghijabcdefghijabcdefghijabcdefghijabcdefghijabcdefghijabcdefghijabcdefghijabcdefghijabcdefghijabcdefghijabcdefghijabcdefghijabcdefghijabcdefghijabcdefghijabcdefghijabcdefghijabcdefghijabcdefghijabcdefghijabcdefghijabcdefghijabcdefghijabcdefghijabcdefghijabcdefghijabcdefghijabcdefghijabcdefghijabcdefghijabcdefghijabcdefghijabcdefghijabcdefghijabcdefghijabcdefghijabcdefghijabcdefghijabcdefghijabcdefghijabcdefghijabcdefghijabcdefghijabcdefghijabcdefghijabcdefghijabcdefghijabcdefghijabcdefghijabcdefghijabcdefghijabcdefghijabcdefghijabcdefghijabcdefghijabcdefghijabcdefghijabcdefghijabcdefghijabcdefghijabcdefghijabc.ID == 1)
+				.ToArray();
+		}
+
+		[Test]
+		public void TestParameterLengthName_Localized([DataSources] string context)
+		{
+			var абвгдеёжзиабвгдеёжзиабвгдеёжзиабвгдеёжзиабвгдеёжзиабвгдеёжзиабвгдеёжзиабвгдеёжзиабвгдеёжзиабвгдеёжзиабвгдеёжзиабвгдеёжзиабвгдеёжзиабвгдеёжзиабвгдеёжзиабвгдеёжзиабвгдеёжзиабвгдеёжзиабвгдеёжзиабвгдеёжзиабвгдеёжзиабвгдеёжзиабвгдеёжзиабвгдеёжзиабвгдеёжзиабвгдеёжзиабвгдеёжзиабвгдеёжзиабвгдеёжзиабвгдеёжзиабвгдеёжзиабвгдеёжзиабвгдеёжзиабвгдеёжзиабвгдеёжзиабвгдеёжзиабвгдеёжзиабвгдеёжзиабвгдеёжзиабвгдеёжзиабвгдеёжзиабвгдеёжзиабвгдеёжзиабвгдеёжзиабвгдеёжзиабвгдеёжзиабвгдеёжзиабвгдеёжзиабвгдеёжзиабвгдеёжзиабвгдеёжзиаz = 1;
+			using var db = GetDataContext(context);
+			db.Person
+				.Where(r => r.ID == абвгдеёжзиабвгдеёжзиабвгдеёжзиабвгдеёжзиабвгдеёжзиабвгдеёжзиабвгдеёжзиабвгдеёжзиабвгдеёжзиабвгдеёжзиабвгдеёжзиабвгдеёжзиабвгдеёжзиабвгдеёжзиабвгдеёжзиабвгдеёжзиабвгдеёжзиабвгдеёжзиабвгдеёжзиабвгдеёжзиабвгдеёжзиабвгдеёжзиабвгдеёжзиабвгдеёжзиабвгдеёжзиабвгдеёжзиабвгдеёжзиабвгдеёжзиабвгдеёжзиабвгдеёжзиабвгдеёжзиабвгдеёжзиабвгдеёжзиабвгдеёжзиабвгдеёжзиабвгдеёжзиабвгдеёжзиабвгдеёжзиабвгдеёжзиабвгдеёжзиабвгдеёжзиабвгдеёжзиабвгдеёжзиабвгдеёжзиабвгдеёжзиабвгдеёжзиабвгдеёжзиабвгдеёжзиабвгдеёжзиабвгдеёжзиабвгдеёжзиаz)
+				.ToArray();
+		}
+
+		[Test]
+		public void TestAliasLengthName_Localized([DataSources] string context)
+		{
+			using var db = GetDataContext(context);
+			db.Person
+				.Where(абвгдеёжзиабвгдеёжзиабвгдеёжзиабвгдеёжзиабвгдеёжзиабвгдеёжзиабвгдеёжзиабвгдеёжзиабвгдеёжзиабвгдеёжзиабвгдеёжзиабвгдеёжзиабвгдеёжзиабвгдеёжзиабвгдеёжзиабвгдеёжзиабвгдеёжзиабвгдеёжзиабвгдеёжзиабвгдеёжзиабвгдеёжзиабвгдеёжзиабвгдеёжзиабвгдеёжзиабвгдеёжзиабвгдеёжзиабвгдеёжзиабвгдеёжзиабвгдеёжзиабвгдеёжзиабвгдеёжзиабвгдеёжзиабвгдеёжзиабвгдеёжзиабвгдеёжзиабвгдеёжзиабвгдеёжзиабвгдеёжзиабвгдеёжзиабвгдеёжзиабвгдеёжзиабвгдеёжзиабвгдеёжзиабвгдеёжзиабвгдеёжзиабвгдеёжзиабвгдеёжзиабвгдеёжзиабвгдеёжзиабвгдеёжзиабвгдеёжзиаz => абвгдеёжзиабвгдеёжзиабвгдеёжзиабвгдеёжзиабвгдеёжзиабвгдеёжзиабвгдеёжзиабвгдеёжзиабвгдеёжзиабвгдеёжзиабвгдеёжзиабвгдеёжзиабвгдеёжзиабвгдеёжзиабвгдеёжзиабвгдеёжзиабвгдеёжзиабвгдеёжзиабвгдеёжзиабвгдеёжзиабвгдеёжзиабвгдеёжзиабвгдеёжзиабвгдеёжзиабвгдеёжзиабвгдеёжзиабвгдеёжзиабвгдеёжзиабвгдеёжзиабвгдеёжзиабвгдеёжзиабвгдеёжзиабвгдеёжзиабвгдеёжзиабвгдеёжзиабвгдеёжзиабвгдеёжзиабвгдеёжзиабвгдеёжзиабвгдеёжзиабвгдеёжзиабвгдеёжзиабвгдеёжзиабвгдеёжзиабвгдеёжзиабвгдеёжзиабвгдеёжзиабвгдеёжзиабвгдеёжзиабвгдеёжзиабвгдеёжзиаz.ID == 1)
+				.ToArray();
+		}
+	}
+}