protected internal override Expression VisitScalar(ScalarExpression scalar)
{
if (!scalar.Select !.IsForXmlPathEmpty)
{
using (Scope())
return(base.VisitScalar(scalar));
}
protected internal override Expression VisitScalar(ScalarExpression exists)
{
sb.Append("(");
this.Visit(exists.Select);
sb.Append(")");
return(exists);
}
protected internal virtual Expression VisitScalar(ScalarExpression scalar)
{
var select = (SelectExpression)this.Visit(scalar.Select);
if (select != scalar.Select)
{
return(new ScalarExpression(scalar.Type, select));
}
return(scalar);
}
protected internal override Expression VisitScalar(ScalarExpression scalar)
{
var column = scalar.Select.Columns.SingleEx();
VisitColumn(new ColumnExpression(scalar.Type, scalar.Select.Alias, column.Name ?? "-"));
var select = (SelectExpression)this.Visit(scalar.Select);
if (select != scalar.Select)
{
return(new ScalarExpression(scalar.Type, select));
}
return(scalar);
}
protected internal override Expression VisitScalar(ScalarExpression scalar)
{
if (connector.SupportsScalarSubquery &&
(!inAggregate || connector.SupportsScalarSubqueryInAggregates))
{
return(base.VisitScalar(scalar));
}
else
{
var select = scalar.Select;
if (string.IsNullOrEmpty(select.Columns[0].Name))
{
select = new SelectExpression(select.Alias, select.IsDistinct, select.Top,
new[] { new ColumnDeclaration("scalar", select.Columns[0].Expression) },
select.From, select.Where, select.OrderBy, select.GroupBy, select.SelectOptions);
}
this.currentFrom = new JoinExpression(JoinType.OuterApply, this.currentFrom, select, null);
return(new ColumnExpression(scalar.Type, scalar.Select.Alias, select.Columns[0].Name));
}
}
protected internal override Expression VisitScalar(ScalarExpression scalar)
{
if (!scalar.Select.IsForXmlPathEmpty)
{
using (Scope())
return(base.VisitScalar(scalar));
}
else
{
using (Scope())
{
var oldOuterMostSelect = outerMostSelect;
outerMostSelect = scalar.Select;
var result = base.VisitScalar(scalar);
outerMostSelect = oldOuterMostSelect;
return(result);
}
}
}
protected internal override Expression VisitScalar(ScalarExpression scalar)
{
return(scalar);
}
protected virtual bool CompareScalar(ScalarExpression a, ScalarExpression b)
{
return(Compare(a.Select, b.Select));
}
protected internal override Expression VisitScalar(ScalarExpression scalar)
{
AddSingleColumn(scalar);
return(base.VisitScalar(scalar));
}
