public void Initialize(QueryEngine <TData> engine, QueryGraph graph, ICollection <QueryError> errors, bool fastYielding)
{
if (graph != null && !graph.empty)
{
m_QueryEnumerable = EnumerableCreator.Create(graph.root, engine, errors, fastYielding);
}
}
public IQueryEnumerable <T> Create <T>(IQueryNode root, QueryEngine <T> engine, ICollection <QueryError> errors, bool fastYielding)
{
if (root.leaf || root.children == null || root.children.Count != 1)
{
errors.Add(new QueryError(root.token.position, root.token.length, "Aggregator node must have a child."));
return(null);
}
var aggregatorNode = root as AggregatorNode;
if (!(aggregatorNode?.aggregator is NestedQueryAggregator <T> handler))
{
errors.Add(new QueryError(root.token.position, root.token.length, "Aggregator node does not have the proper aggregator set."));
return(null);
}
var childEnumerable = EnumerableCreator.Create(root.children[0], engine, errors, fastYielding);
return(new AggregateEnumerable <T>(childEnumerable, handler.aggregator, fastYielding));
}