protected string ConcretePropertySelectFragment(string alias, IInclusionChecker inclusionChecker)
		{
			int propertyCount = PropertyNames.Length;
			int[] propertyTableNumbers = PropertyTableNumbersInSelect;
			SelectFragment frag = new SelectFragment(Factory.Dialect);
			for (int i = 0; i < propertyCount; i++)
			{
				if (inclusionChecker.IncludeProperty(i))
				{
					frag.AddColumns(GenerateTableAlias(alias, propertyTableNumbers[i]), propertyColumnNames[i], propertyColumnAliases[i]);
					frag.AddFormulas(GenerateTableAlias(alias, propertyTableNumbers[i]), propertyColumnFormulaTemplates[i], propertyColumnAliases[i]);
				}
			}
			return frag.ToFragmentString();
		}
		protected virtual void AppendIndexColumns(SelectFragment frag, string alias)
		{
			if (hasIndex)
			{
				frag.AddColumns(alias, indexColumnNames, indexColumnAliases);
			}
		}
		public SqlString SelectFragment( string alias )
		{
			SelectFragment frag = new SelectFragment( dialect )
				.SetSuffix( String.Empty ) //always ignore suffix for collection columns
				.AddColumns( alias, keyColumnNames, keyColumnAliases )
				.AddColumns( alias, elementColumnNames, elementColumnAliases );
			if( hasIndex )
			{
				frag.AddColumns( alias, indexColumnNames, indexColumnAliases );
			}
			if( hasIdentifier )
			{
				frag.AddColumn( alias, identifierColumnName, identifierColumnAlias );
			}
			return frag.ToSqlStringFragment( false );
		}
		private SqlString ConcretePropertySelectFragment( string alias, bool[] includeProperty )
		{
			int propertyCount = propertyColumnNames.Length;
			SelectFragment frag = new SelectFragment( Dialect );

			for( int i = 0; i < propertyCount; i++ )
			{
				if( includeProperty[ i ] )
				{
					frag.AddColumns(
						Alias( alias, propertyTables[ i ] ),
						propertyColumnNames[ i ],
						propertyColumnNameAliases[ i ] );
				}
			}

			return frag.ToSqlStringFragment( );
		}
		// TODO NH: should remove duplication between this and the other overload,
		// probably using H3 approach (adding indirection through IInclusionChecker interface).
		protected string ConcretePropertySelectFragment(string alias, ValueInclusion[] inclusions)
		{
			int propertyCount = entityMetamodel.PropertySpan;
			int[] propertyTableNumbers = PropertyTableNumbersInSelect;
			SelectFragment frag = new SelectFragment(Factory.Dialect);
			for (int i = 0; i < propertyCount; i++)
			{
				if (inclusions[i] != ValueInclusion.None)
				{
					//ie. updateable, not a formula
					frag.AddColumns(
						GenerateTableAlias(alias, propertyTableNumbers[i]),
						propertyColumnNames[i],
						propertyColumnAliases[i]
						);
					frag.AddFormulas(
						GenerateTableAlias(alias, propertyTableNumbers[i]),
						propertyColumnFormulaTemplates[i],
						propertyColumnAliases[i]
						);
				}
			}
			return frag.ToSqlStringFragment();
		}