internal override SqlExpression VisitAliasRef(SqlAliasRef aref)
{
SqlNode node = aref.Alias.Node;
if ((node is SqlTable) || (node is SqlTableValuedFunctionCall))
{
return(aref);
}
SqlUnion union = node as SqlUnion;
if (union != null)
{
return(this.ExpandUnion(union));
}
SqlSelect select = node as SqlSelect;
if (select != null)
{
return(this.VisitExpression(select.Selection));
}
SqlExpression exp = node as SqlExpression;
if (exp == null)
{
throw Error.CouldNotHandleAliasRef(node.NodeType);
}
return(this.VisitExpression(exp));
}
private static IProviderType GetSqlType(SqlNode node)
{
SqlExpression expression = node as SqlExpression;
if (expression != null)
{
return(expression.SqlType);
}
SqlSelect select = node as SqlSelect;
if (select != null)
{
return(select.Selection.SqlType);
}
SqlTable table = node as SqlTable;
if (table != null)
{
return(table.SqlRowType);
}
SqlUnion union = node as SqlUnion;
if (union == null)
{
throw Error.UnexpectedNode(node.NodeType);
}
return(union.GetSqlType());
}
internal override SqlNode VisitUnion(SqlUnion su)
{
bool changed = false;
bool containsLongExpressions = false;
SqlSelect left = su.Left as SqlSelect;
if (left != null)
{
this.ConvertColumnsToMax(left, out changed, out containsLongExpressions);
}
bool flag3 = false;
bool flag4 = false;
SqlSelect right = su.Right as SqlSelect;
if (right != null)
{
this.ConvertColumnsToMax(right, out flag3, out flag4);
}
if (!su.All && (containsLongExpressions || flag4))
{
this.annotations.Add(su,
new SqlServerCompatibilityAnnotation(
Strings.TextNTextAndImageCannotOccurInUnion(su.SourceExpression),
new SqlProvider.ProviderMode[]
{ SqlProvider.ProviderMode.Sql2000, SqlProvider.ProviderMode.SqlCE }));
}
return(base.VisitUnion(su));
}
private void GatherUnionExpressions(SqlNode node, IList <SqlExpression> exprs)
{
SqlUnion union = node as SqlUnion;
if (union != null)
{
this.GatherUnionExpressions(union.Left, exprs);
this.GatherUnionExpressions(union.Right, exprs);
}
else
{
SqlSelect select = node as SqlSelect;
if (select != null)
{
SqlAliasRef selection = select.Selection as SqlAliasRef;
if (selection != null)
{
this.GatherUnionExpressions(selection.Alias.Node, exprs);
}
else
{
exprs.Add(select.Selection);
}
}
}
}
private SqlExpression ExpandUnion(SqlUnion union)
{
IList <SqlExpression> exprs = new List <SqlExpression>(2);
this.GatherUnionExpressions(union, exprs);
this.sourceExpression = union.SourceExpression;
return(this.ExpandTogether(exprs));
}
internal override SqlSelect VisitSelect(SqlSelect select)
{
base.VisitSelect(select);
SqlUnion union = this.GetUnion(select.From);
if (union != null)
{
SqlSelect left = union.Left as SqlSelect;
SqlSelect right = union.Right as SqlSelect;
if (!((left != null) & (right != null)))
{
return(select);
}
int num = 0;
int count = left.Row.Columns.Count;
while (num < count)
{
left.Row.Columns[num].Ordinal = select.Row.Columns.Count + num;
num++;
}
int num3 = 0;
int num4 = right.Row.Columns.Count;
while (num3 < num4)
{
right.Row.Columns[num3].Ordinal = select.Row.Columns.Count + num3;
num3++;
}
int num5 = 0;
int num6 = select.Row.Columns.Count;
while (num5 < num6)
{
SqlExprSet expression = select.Row.Columns[num5].Expression as SqlExprSet;
if (expression != null)
{
int num7 = 0;
int num8 = expression.Expressions.Count;
while (num7 < num8)
{
SqlColumnRef ref2 = expression.Expressions[num7] as SqlColumnRef;
if ((ref2 != null) && (num7 >= select.Row.Columns.Count))
{
ref2.Column.Ordinal = num5;
}
num7++;
}
}
num5++;
}
Comparison <SqlColumn> comparison = delegate(SqlColumn x, SqlColumn y)
{
return(x.Ordinal - y.Ordinal);
};
left.Row.Columns.Sort(comparison);
right.Row.Columns.Sort(comparison);
}
return(select);
}
internal override SqlNode VisitUnion(SqlUnion su)
{
this.orders = null;
su.Left = this.Visit(su.Left);
this.orders = null;
su.Right = this.Visit(su.Right);
this.orders = null;
return(su);
}
internal override SqlNode VisitUnion(SqlUnion su)
{
bool forceReferenceAll = this.forceReferenceAll;
this.forceReferenceAll = true;
su.Left = this.Visit(su.Left);
su.Right = this.Visit(su.Right);
this.forceReferenceAll = forceReferenceAll;
return(su);
}
internal override SqlNode VisitUnion(SqlUnion su)
{
if (su.All)
{
this.IsValid = false;
}
this.IsDistinct = true;
this.AddIdentityMembers(su.GetClrType().GetProperties());
return(su);
}
internal override SqlNode VisitUnion(SqlUnion su)
{
Scope current = this.current;
this.current = null;
SqlNode node = base.VisitUnion(su);
this.current = current;
return(node);
}
// Methods
private SqlUnion GetUnion(SqlSource source)
{
SqlAlias alias = source as SqlAlias;
if (alias != null)
{
SqlUnion node = alias.Node as SqlUnion;
if (node != null)
{
return(node);
}
}
return(null);
}
private static Type GetClrType(SqlNode node)
{
SqlTableValuedFunctionCall call = node as SqlTableValuedFunctionCall;
if (call != null)
{
return(call.RowType.Type);
}
SqlExpression expression = node as SqlExpression;
if (expression != null)
{
if (TypeSystem.IsSequenceType(expression.ClrType))
{
return(TypeSystem.GetElementType(expression.ClrType));
}
return(expression.ClrType);
}
SqlSelect select = node as SqlSelect;
if (select != null)
{
return(select.Selection.ClrType);
}
SqlTable table = node as SqlTable;
if (table != null)
{
return(table.RowType.Type);
}
SqlUnion union = node as SqlUnion;
if (union == null)
{
throw Error.UnexpectedNode(node.NodeType);
}
return(union.GetClrType());
}
internal override SqlNode VisitUnion(SqlUnion su)
{
this.canJoin = false;
return(base.VisitUnion(su));
}
internal virtual SqlNode VisitUnion(SqlUnion su)
{
su.Left = this.Visit(su.Left);
su.Right = this.Visit(su.Right);
return(su);
}
internal override SqlNode VisitUnion(SqlUnion su)
{
return(su);
}
internal override SqlNode VisitUnion(SqlUnion su)
{
return(new SqlUnion(this.Visit(su.Left), this.Visit(su.Right), su.All));
}
