@Test
public void testPut() {

    IndexImpl<Node> index = generateEmptyIndex();
    Column column = index.columnStore.getColumn("age");
    NodeImpl n = new NodeImpl(0);
    Integer v = 10;
    Assert.assertSame(index.put(column, v, n), v);
    Assert.assertEquals(index.count(column, v), 1);
    Assert.assertSame(index.put(column, v, n), v);
    Assert.assertEquals(index.count(column, v), 1);
}