I was trying to get the first index that matched a certain value (like Java List's indexOf method) and I couldn't find anything like that in the column's implementation.

Is that functionality not implemented?

For now I'm transforming the column into a List to use the method, but I think it's too much work for something that shouldn't be so complicated.

If it's actually a missing feature I think that the same implementation as Java Lists would work:

public int indexOf(Object o) {
  Objects.requireNonNull(o);
  for (int i = 0, s = size(); i < s; i++) {
    if (o.equals(get(i)) {
      return i;
    }
  }
  return -1;
}