private void FlattenSubQuery(SubQueryExpression subQueryExpression, MainFromClause fromClause,
QueryModel queryModel)
{
// Create a new client-side select for the outer
// TODO - don't like calling GetGenericArguments here...
var clientSideSelect = new ClientSideSelect(new NonAggregatingGroupBySelectRewriter().Visit(queryModel.SelectClause.Selector, subQueryExpression.Type.GetGenericArguments()[0], queryModel.MainFromClause));
// Replace the outer select clause...
queryModel.SelectClause = subQueryExpression.QueryModel.SelectClause;
MainFromClause innerMainFromClause = subQueryExpression.QueryModel.MainFromClause;
CopyFromClauseData(innerMainFromClause, fromClause);
// Move the result operator up
if (queryModel.ResultOperators.Count != 0)
{
throw new NotImplementedException();
}
queryModel.ResultOperators.Add(new NonAggregatingGroupBy((GroupResultOperator) subQueryExpression.QueryModel.ResultOperators[0]));
queryModel.ResultOperators.Add(clientSideSelect);
}
private void ProcessClientSideSelect(ClientSideSelect resultOperator)
{
var inputType = resultOperator.SelectClause.Parameters[0].Type;
var outputType = resultOperator.SelectClause.Type.GetGenericArguments()[1];
var inputList = Expression.Parameter(typeof (IEnumerable<>).MakeGenericType(inputType), "inputList");
var selectMethod = EnumerableHelper.GetMethod("Select", new[] { typeof(IEnumerable<>), typeof(Func<,>) }, new[] { inputType, outputType });
var toListMethod = EnumerableHelper.GetMethod("ToList", new[] {typeof (IEnumerable<>)}, new[] {outputType});
var lambda = Expression.Lambda(
Expression.Call(toListMethod,
Expression.Call(selectMethod, inputList, resultOperator.SelectClause)),
inputList);
_listTransformers.Add(lambda);
}
