s&p update models

macros/tests/at_least_one_null.sql

@@ -0,0 +1,10 @@
+{% test at_least_one_null(model, columns) %}
+
+    select *
+    from {{ model }}
+    where
+        {% for column in columns %}
+            {{ column }} is not null {% if not loop.last %} and {% endif %}
+        {% endfor %}
+-- If all columns are not null, the row violates the test
+{% endtest %}