public void Add(string op, SelectStmt newstmt)
{
List <string> allowed = new List <string>
{
"union", "unionall", "except", "exceptall", "intersect", "intersectall"
};
Debug.Assert(allowed.Contains(op) || op is null);
Debug.Assert(newstmt != null);
if (IsLeaf())
{
left_ = new SetOpTree(stmt_);
stmt_ = null;
right_ = new SetOpTree(newstmt);
op_ = op;
}
else
{
left_ = (SetOpTree)this.MemberwiseClone();
right_ = new SetOpTree(newstmt);
op_ = op;
}
Debug.Assert(!IsLeaf());
}
public SelectStmt(
// setops ok fields
List <Expr> selection, List <TableRef> from, Expr where, List <Expr> groupby, Expr having,
// top query only fields
List <CteExpr> ctes, SetOpTree setqs, List <OrderTerm> orders, Expr limit,
string text) : base(text)
{
selection_ = selection;
from_ = from;
where_ = where;
having_ = having;
groupby_ = groupby;
ctes_ = ctes;
setops_ = setqs;
if (orders != null)
{
orders_ = (from x in orders select x.orderby_()).ToList();
descends_ = (from x in orders select x.descend_).ToList();
}
limit_ = limit;
}
