protected override ShapedQueryExpression TranslateSelect(ShapedQueryExpression source, LambdaExpression selector)
{
if (selector.Body == selector.Parameters[0])
{
return(source);
}
var newSelectorBody = ReplacingExpressionVisitor.Replace(
selector.Parameters.Single(), source.ShaperExpression, selector.Body);
source.ShaperExpression = _projectionBindingExpressionVisitor
.Translate((InMemoryQueryExpression)source.QueryExpression, newSelectorBody);
return(source);
}
protected override ShapedQueryExpression TranslateGroupBy(ShapedQueryExpression source, LambdaExpression keySelector, LambdaExpression elementSelector, LambdaExpression resultSelector)
{
var remappedKeySelector = RemapLambdaBody(source, keySelector);
var translatedKey = TranslateGroupingKey(remappedKeySelector);
if (translatedKey != null)
{
if (elementSelector != null)
{
source = TranslateSelect(source, elementSelector);
}
var inMemoryQueryExpression = (InMemoryQueryExpression)source.QueryExpression;
source.ShaperExpression = inMemoryQueryExpression.ApplyGrouping(translatedKey, source.ShaperExpression);
if (resultSelector == null)
{
return(source);
}
var keyAccessExpression = Expression.MakeMemberAccess(
source.ShaperExpression,
source.ShaperExpression.Type.GetTypeInfo().GetMember(nameof(IGrouping <int, int> .Key))[0]);
var original1 = resultSelector.Parameters[0];
var original2 = resultSelector.Parameters[1];
var newResultSelectorBody = new ReplacingExpressionVisitor(
new Dictionary <Expression, Expression> {
{ original1, keyAccessExpression },
{ original2, source.ShaperExpression }
}).Visit(resultSelector.Body);
newResultSelectorBody = ExpandWeakEntities(inMemoryQueryExpression, newResultSelectorBody);
source.ShaperExpression = _projectionBindingExpressionVisitor.Translate(inMemoryQueryExpression, newResultSelectorBody);
inMemoryQueryExpression.PushdownIntoSubquery();
return(source);
}
return(null);
}