private static Type GetClrType(SqlNode node)
{
SqlTableValuedFunctionCall tvf = node as SqlTableValuedFunctionCall;
if (tvf != null)
{
return(tvf.RowType.Type);
}
SqlExpression exp = node as SqlExpression;
if (exp != null)
{
if (TypeSystem.IsSequenceType(exp.ClrType))
{
return(TypeSystem.GetElementType(exp.ClrType));
}
return(exp.ClrType);
}
SqlSelect sel = node as SqlSelect;
if (sel != null)
{
return(sel.Selection.ClrType);
}
SqlTable tab = node as SqlTable;
if (tab != null)
{
return(tab.RowType.Type);
}
SqlUnion su = node as SqlUnion;
if (su != null)
{
return(su.GetClrType());
}
throw Error.UnexpectedNode(node.NodeType);
}
internal override SqlNode VisitUnion(SqlUnion su)
{
// we don't want to descend inward
// just check that it's not a UNION ALL
if(su.All)
{
_isValid = false;
}
// UNIONs are distinct
_isDistinct = true;
// get all members from selection
this.AddIdentityMembers(su.GetClrType().GetProperties());
return su;
}
