public override DbExpression Visit(DbGroupByExpression expression)
{
Check.NotNull(expression, "expression");
DbExpression result = expression;
var newInput = VisitGroupExpressionBinding(expression.Input);
EnterScope(newInput.Variable);
var newKeys = VisitExpressionList(expression.Keys);
ExitScope();
EnterScope(newInput.GroupVariable);
var newAggs = VisitList(expression.Aggregates, VisitAggregate);
ExitScope();
if (!ReferenceEquals(expression.Input, newInput)
||
!ReferenceEquals(expression.Keys, newKeys)
||
!ReferenceEquals(expression.Aggregates, newAggs))
{
var groupOutput =
TypeHelpers.GetEdmType <RowType>(TypeHelpers.GetEdmType <CollectionType>(expression.ResultType).TypeUsage);
var boundKeys = groupOutput.Properties.Take(newKeys.Count).Select(p => p.Name).Zip(newKeys).ToList();
var boundAggs = groupOutput.Properties.Skip(newKeys.Count).Select(p => p.Name).Zip(newAggs).ToList();
result = CqtBuilder.GroupBy(newInput, boundKeys, boundAggs);
}
NotifyIfChanged(expression, result);
return(result);
}
/// <summary>
/// Visitor pattern method for <see cref="T:System.Data.Entity.Core.Common.CommandTrees.DbGroupByExpression" />.
/// </summary>
/// <param name="expression"> The DbExpression that is being visited. </param>
/// <exception cref="T:System.ArgumentNullException">
/// <paramref name="expression" />
/// is null
/// </exception>
public override void Visit(DbGroupByExpression expression)
{
Check.NotNull <DbGroupByExpression>(expression, nameof(expression));
this.VisitGroupExpressionBindingPre(expression.Input);
this.VisitExpressionList(expression.Keys);
this.VisitGroupExpressionBindingMid(expression.Input);
this.VisitAggregateList(expression.Aggregates);
this.VisitGroupExpressionBindingPost(expression.Input);
}
/// <summary>
/// Visitor pattern method for <see cref="DbGroupByExpression" />.
/// </summary>
/// <param name="expression"> The DbExpression that is being visited. </param>
/// <exception cref="ArgumentNullException">
/// <paramref name="expression" />
/// is null
/// </exception>
public override void Visit(DbGroupByExpression expression)
{
Check.NotNull(expression, "expression");
VisitGroupExpressionBindingPre(expression.Input);
VisitExpressionList(expression.Keys);
VisitGroupExpressionBindingMid(expression.Input);
VisitAggregateList(expression.Aggregates);
VisitGroupExpressionBindingPost(expression.Input);
}
/// <summary> /// When overridden in a derived class, implements the visitor pattern for /// <see /// cref="T:System.Data.Entity.Core.Common.CommandTrees.DbGroupByExpression" /> /// . /// </summary> /// <returns>A result value of a specific type.</returns> /// <param name="expression"> /// The <see cref="T:System.Data.Entity.Core.Common.CommandTrees.DbGroupByExpression" /> that is being visited. /// </param> public abstract TResultType Visit(DbGroupByExpression expression);
/// <summary> /// When overridden in a derived class, implements the visitor pattern for /// <see cref="T:System.Data.Entity.Core.Common.CommandTrees.DbGroupByExpression" /> /// . /// </summary> /// <param name="expression"> /// The <see cref="T:System.Data.Entity.Core.Common.CommandTrees.DbGroupByExpression" /> that is visited. /// </param> public abstract void Visit(DbGroupByExpression expression);
public override void Visit(DbGroupByExpression expression)
{
}