Extract json array from postgres table gives error: cannot extract elements from a scalar

Question

By using jsonb_array_elements() function to extract out jsonb data array from Postgres, it gave error:

cannot extract elements f

Answer 1

After some research I see there was a change at PostgreSQL 10 that broke the original answer.

Here is how I did the example in 10.

select jsonb_array_elements(test.date) as date
from
(select
  case when jsonb_typeof(jsonb_column->'stats_by_date'->'date') = 'array'
       then jsonb_column->'stats_by_date'->'date'
       else jsonb_build_array(jsonb_column->'stats_by_date'->'date')
  end as date
from (
  select '{"stats_by_date": {"date": 123}}'::jsonb -- scalar (type: 'number')
  union all
  select '{"stats_by_date": {"date": [456]}}'::jsonb -- array (type: 'array')
  ) foo(jsonb_column)) as test;