/// <summary>
/// Add each column that you want to include in the query. Only include the columns that are relevant to the procedure for best performance.
/// </summary>
/// <param name="columnName">Column name as represented in database</param>
/// <returns></returns>
public ColumnSelect <T> AddColumn(Expression <Func <T, object> > columnName)
{
var propertyName = _helper.GetPropertyName(columnName);
Columns.Add(propertyName);
return(new ColumnSelect <T>(_list, _tableName, Columns, _schema, _sourceAlias, _targetAlias,
_sqlTimeout, _bulkCopyTimeout, _bulkCopyEnableStreaming, _bulkCopyNotifyAfter, _bulkCopyBatchSize, _sqlBulkCopyOptions, _ext));
}