protected override Expression VisitSubquery(SubqueryExpression subquery)
{
var saveOrderings = this.gatheredOrderings;
this.gatheredOrderings = null;
var result = base.VisitSubquery(subquery);
this.gatheredOrderings = saveOrderings;
return(result);
}
protected override Expression VisitSubquery(SubqueryExpression subquery)
{
if ((subquery.NodeType == (ExpressionType)DbExpressionType.Scalar ||
subquery.NodeType == (ExpressionType)DbExpressionType.In) &&
subquery.Select != null)
{
System.Diagnostics.Debug.Assert(subquery.Select.Columns.Count == 1);
MarkColumnAsUsed(subquery.Select.Alias, subquery.Select.Columns[0].Name);
}
return(base.VisitSubquery(subquery));
}
protected virtual Expression VisitSubquery(SubqueryExpression subquery)
{
switch ((DbExpressionType)subquery.NodeType)
{
case DbExpressionType.Scalar:
return(this.VisitScalar((ScalarExpression)subquery));
case DbExpressionType.Exists:
return(this.VisitExists((ExistsExpression)subquery));
case DbExpressionType.In:
return(this.VisitIn((InExpression)subquery));
}
return(subquery);
}
protected virtual bool CompareSubquery(SubqueryExpression a, SubqueryExpression b)
{
if (a.NodeType != b.NodeType)
{
return(false);
}
switch ((DbExpressionType)a.NodeType)
{
case DbExpressionType.Scalar:
return(this.CompareScalar((ScalarExpression)a, (ScalarExpression)b));
case DbExpressionType.Exists:
return(this.CompareExists((ExistsExpression)a, (ExistsExpression)b));
case DbExpressionType.In:
return(this.CompareIn((InExpression)a, (InExpression)b));
}
return(false);
}
protected override Expression VisitSubquery(SubqueryExpression subquery)
{
// don't gather inside scalar & exists
return(subquery);
}
protected override Expression VisitSubquery(SubqueryExpression subquery)
{
// don't count aggregates in subqueries
return(subquery);
}
protected override Expression VisitSubquery(SubqueryExpression subquery)
{
return(subquery);
}
