public override IList<int[]> Evaluate(GroupByRollupEvalContext context)
{
var result = new int[expressions.Count];
for (var i = 0; i < expressions.Count; i++) {
int index = context.GetIndex(expressions[i]);
result[i] = index;
}
Collections.SortInPlace(result);
// find dups
for (var i = 0; i < result.Length - 1; i++) {
if (result[i] == result[i + 1]) {
throw new GroupByRollupDuplicateException(new[] {result[i]});
}
}
return Collections.SingletonList(result);
}
public override IList<int[]> Evaluate(GroupByRollupEvalContext context)
{
int index = context.GetIndex(expression);
return Collections.SingletonList(new[] {index});
}