public <TResult> Queryable<TResult> select(
Queryable<T> source, FunctionExpression<Function1<T, TResult>> selector) {
RelNode child = toRel(source);
List<RexNode> nodes = translator.toRexList(selector, child);
setRel(
new ProjectRel(
translator.cluster,
child,
nodes.toArray(new RexNode[nodes.size()]),
null,
ProjectRelBase.Flags.Boxed));
return null;
}
