Class Vis

test/sql/test_external_traversal.py:649–651

        assert str(clause) == str(CloningVisitor().traverse(clause))

        class Vis(CloningVisitor):
            def visit_binary(self, binary):
                binary.right = t2.c.col3

        clause2 = Vis().traverse(clause)
        assert c1 == str(clause)