protected ScalarExpression UpdateScalar(ScalarExpression scalar, SelectExpression select)
{
if (select != scalar.Select)
{
return(new ScalarExpression(scalar.Type, select));
}
return(scalar);
}
protected override Expression VisitScalar(ScalarExpression subquery)
{
this.Write("(");
this.WriteLine(Indentation.Inner);
this.Visit(subquery.Select);
this.WriteLine(Indentation.Same);
this.Write(")");
this.Indent(Indentation.Outer);
return(subquery);
}
protected virtual bool CompareScalar(ScalarExpression a, ScalarExpression b)
{
return(this.Compare(a.Select, b.Select));
}
public AggregateSubqueryExpression(TableAlias groupByAlias, Expression aggregateInGroupSelect, ScalarExpression aggregateAsSubquery) : base(DbExpressionType.AggregateSubquery, aggregateAsSubquery.Type)
{
this.aggregateInGroupSelect = aggregateInGroupSelect;
this.groupByAlias = groupByAlias;
this.aggregateAsSubquery = aggregateAsSubquery;
}
protected virtual Expression VisitScalar(ScalarExpression scalar)
{
SelectExpression select = (SelectExpression)this.Visit(scalar.Select);
return(this.UpdateScalar(scalar, select));
}
protected virtual Expression VisitAggregateSubquery(AggregateSubqueryExpression aggregate)
{
ScalarExpression subquery = (ScalarExpression)this.Visit(aggregate.AggregateAsSubquery);
return(this.UpdateAggregateSubquery(aggregate, subquery));
}
protected AggregateSubqueryExpression UpdateAggregateSubquery(AggregateSubqueryExpression aggregate, ScalarExpression subquery)
{
if (subquery != aggregate.AggregateAsSubquery)
{
return(new AggregateSubqueryExpression(aggregate.GroupByAlias, aggregate.AggregateInGroupSelect, subquery));
}
return(aggregate);
}