SqlHierarchy doesn't produce child ids properly

[jmounce]

I think this line needs to change to:
public SqlHierarchyId GetDescendant(SqlHierarchyId child1, SqlHierarchyId child2) => new SqlHierarchyId(_imp.GetDescendant(child1.IsNull ? default(HierarchyId?) : child1._imp, child2.IsNull ? default(HierarchyId?) : child2._imp));
Otherwise, you can't create the first child. Unless I'm missing something...

[dotMorten]

Thanks. Do you have an example I can use for a unit test to confirm behavior?

[jmounce]

This is what I used. Simple enough:
`
[Fact]
public void InsertFirstChild()
{
SqlHierarchyId id = Types.SqlHierarchyId.GetRoot();
SqlHierarchyId idChild = id.GetDescendant(Types.SqlHierarchyId.Null, Types.SqlHierarchyId.Null);

		Assert.Equal(id, idChild.GetAncestor(1));
	}

`

[dotMorten]

Thanks! Fixed with ad8744f