Story #15781
Updated by Peter Amstutz about 5 years ago
https://www.postgresql.org/docs/9.5/functions-json.html
<pre>
arvados_development=# select '{"a":["foo","bar"]}'::jsonb @> '{"a":["bar"]}'::jsonb;
?column?
----------
t
</pre>
So jsonb subset match works if you know the key and are looking for an exact match on the value.