private void SerializeSelectColumns(IEnumerable <SelectColumn> selectColumns, BinaryWriter writer)
{
var list = selectColumns == null ? new List <SelectColumn>() : selectColumns.ToList();
writer.Write(list.Count);
for (int i = 0; i < list.Count; i++)
{
var column = list[i];
SelectColumn.Serialize(column, writer);
}
}
