node_properties_query = '\nMATCH (
n)\nWITH keys(n) as keys, labels(n) AS labels\nWITH CASE WHEN keys = [] THEN [NULL] ELSE keys END AS keys, labels\nUNWIND labels AS label\nUNWIND keys AS key\nWITH label, collect(DISTINCT key
) AS keys\nRETURN {label:label, keys:keys} AS output\n'