/// <summary>
///
/// </summary>
/// <param name="groupByAlias"></param>
/// <param name="aggregateInGroupSelect"></param>
/// <param name="aggregateAsSubquery"></param>
public AggregateSubqueryExpression(TableAlias groupByAlias, Expression aggregateInGroupSelect, ScalarExpression aggregateAsSubquery)
: base(DbExpressionType.AggregateSubquery, aggregateAsSubquery.Type)
{
this.aggregateInGroupSelect = aggregateInGroupSelect;
this.groupByAlias = groupByAlias;
this.aggregateAsSubquery = aggregateAsSubquery;
}
/// <summary>
///
/// </summary>
/// <param name="scalar"></param>
/// <returns></returns>
protected virtual Expression VisitScalar(ScalarExpression scalar)
{
SelectExpression select = (SelectExpression)this.Visit(scalar.Select);
if (select != scalar.Select)
{
return(new ScalarExpression(scalar.Type, select));
}
return(scalar);
}
/// <summary>
///
/// </summary>
/// <param name="aggregate"></param>
/// <returns></returns>
protected virtual Expression VisitAggregateSubquery(AggregateSubqueryExpression aggregate)
{
Expression e = this.Visit(aggregate.AggregateAsSubquery);
System.Diagnostics.Debug.Assert(e is ScalarExpression);
ScalarExpression subquery = (ScalarExpression)e;
if (subquery != aggregate.AggregateAsSubquery)
{
return(new AggregateSubqueryExpression(aggregate.GroupByAlias, aggregate.AggregateInGroupSelect, subquery));
}
return(aggregate);
}
/// <summary>
///
/// </summary>
/// <param name="a"></param>
/// <param name="b"></param>
/// <returns></returns>
protected virtual bool CompareScalar(ScalarExpression a, ScalarExpression b)
{
return(this.Compare(a.Select, b.Select));
}