// one.
assert !(column instanceof DeletedColumn) : "Wrong class type: " + column.getClass();
if (timestampOfLastDelete() < ((CounterColumn)column).timestampOfLastDelete())
return column;
ContextRelationship rel = contextManager.diff(column.value(), value());
if (ContextRelationship.GREATER_THAN == rel || ContextRelationship.DISJOINT == rel)
return column;
return null;
}