protected internal override Node VisitSelectFromStatement(SelectFromStatement node)
{
node = (SelectFromStatement)base.VisitSelectFromStatement(node);
if (node.Groupings.Any())
{
var groupQuery = GroupQueryVisitor.GetGroupQuery(node, this.data);
var groupFactories = this.GetGroupValueFactory(groupQuery.Expressions.Concat(new[]
{
new AliasedSqlExpression(groupQuery.Having, "$having"),
}).Concat(groupQuery.OrderBy.Select((o, i) => new AliasedSqlExpression(o.Expression, $"$order{i}"))).Where(e => e.Expression != null));
var plan = this.CreateSelectQueryPlan(groupQuery.RowSelect);
var fields = node.Expressions.Select(f => f.Expression is WildcardSqlExpression ? "*" : f.Alias);
var orders = groupQuery.OrderBy.Select((o, i) => new OrderByExpression(CustomExpression.MakeSourceField(null, $"$order{i}", true), o.Ascending));
var having = groupQuery.Having == null ? null : CustomExpression.MakeSourceField(null, "$having", true, typeof(bool));
var aliases = groupQuery.Expressions;
this.data.SetQueryPlan(node, new SelectGroupByQueryPlan(plan, groupFactories, groupQuery.Groupings, aliases, having, orders, fields));
}
else
{
this.data.SetQueryPlan(node, this.CreateSelectQueryPlan(node));
}
return(node);
}
public static IGroupQuery GetGroupQuery(SelectFromStatement select, INodeDataProvider data)
{
var visitor = new GroupQueryVisitor(select, data);
return(new GroupQuery(visitor.Visit(select), visitor.Expressions, visitor.Groupings, visitor.Having, visitor.OrderBy));
}
