func Group(ds *rdb.Dataset, key string) map[string]*rdb.Dataset {
values := ds.GetDatasetStringValues(key)
valueSet := map[string]string{}
for _, value := range values {
_, exists := valueSet[value]
if !exists {
valueSet[value] = value
}
}
grouped := map[string]*rdb.Dataset{}
for value, _ := range valueSet {
filter := func(str string) bool {
return str == value
}
grouped[value] = ds.FilterDataset(filter, key).RenameDataset(ds.GetName() + " " + value)
}
return grouped
}
