Github user LosD commented on a diff in the pull request:

    https://github.com/apache/metamodel/pull/160#discussion_r136401855
  
    --- Diff: 
core/src/main/java/org/apache/metamodel/schema/MutableRelationship.java ---
    @@ -134,4 +139,17 @@ private MutableRelationship(List<Column> 
primaryColumns, List<Column> foreignCol
                return _foreignColumns;
        }
     
    +    private void readObject(ObjectInputStream stream) throws IOException, 
ClassNotFoundException {
    +        final GetField getFields = stream.readFields();
    +        Object primaryColumns = getFields.get("_primaryColumns", null);
    +        Object foreignColumns = getFields.get("_foreignColumns", null);
    +        if (primaryColumns instanceof Column[] && foreignColumns 
instanceof Column[]) {
    --- End diff --
    
    In that case, LGTM! I'll merge 


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