public JoinedTable(JoinedTable other)
{
SecondTable = other.SecondTable.Clone() as SingleTable;
FirstColumn = other.FirstColumn.Clone() as ColumnRef;
SecondColumn = other.SecondColumn.Clone() as ColumnRef;
JoinType = other.JoinType;
}
public JoinedTable()
{
SecondTable = new TableSource();
FirstColumn = new ColumnRef("");
SecondColumn = new ColumnRef("");
JoinType = JoinType.INNER;
}