/// <summary>
/// Transform input document into a new output document. Can be used with each document, group by or all source
/// </summary>
public ILiteQueryableAsyncResult <BsonDocument> Select(BsonExpression selector)
{
return(new LiteQueryableAsync <BsonDocument>((ILiteQueryable <BsonDocument>)_wrappedQuery.Select(selector), _liteDatabaseAsync));
}