从Postgresql表的多列字段中提取键，值

Question

从上一篇文章中，我可以使用

将postgres表中json格式的许多值提取到普通列中

select *, "columns"->>'uid' as uid, "columns"->>'name' as name
from myTable;

id |                   columns             |         timestamp          | query_id | task_id
---+---------------------------------------+----------------------------+----------+---------
 1 | {"uid": "112", "name": "redis-server"}| 2018-07-18 18:45:39.045387 |        1 |      2
 2 | {"uid": "0", "name": "celery"}        | 2018-07-18 18:45:39.047671 |        1 |      2
 3 | {"uid": "111", "name": "post"}        | 2018-07-18 18:45:39.048218 |        1 |      2
 4 | {"uid": "111", "name": "post"}        | 2018-07-18 18:45:39.048732 |        1 |      2

但是现在我在json中有100多个不同的字段（如uid，name这样的字段集），我可以使用大量的运算符或脚本来