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