基于JSONB数据和varchar coloum在Postgres中连接表

Question

需要根据两个不同的变量加入两个表。我可以在单独运行select查询时获取输出，但在执行连接时，查询被挂起并且必须强行停止。

Select CAST(n.representation->'m2m:cin'->'rn' as text) 
from notification n,
     contentinstance 
where CAST(n.representation->'m2m:cin'->'rn' as text) = name 
limit 2; 

列：

• name = character varying(200)
• representaion = jsonB