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| 1 | +create or replace function public.jsonb_unnest_recursive_distinct(data jsonb[]) |
| 2 | + returns table( |
| 3 | + path text[], |
| 4 | + value jsonb, |
| 5 | + member_of text |
| 6 | + ) |
| 7 | + immutable |
| 8 | + returns null on null input -- = strict |
| 9 | + parallel safe -- Postgres 10 or later |
| 10 | + security invoker |
| 11 | + language sql |
| 12 | + set search_path = '' |
| 13 | +as $func$ |
| 14 | + --explain (analyse) |
| 15 | + with recursive r (path, value, member_of) as |
| 16 | + ( |
| 17 | + select |
| 18 | + distinct --!!! also fix performance problem |
| 19 | + array[k.key], |
| 20 | + v.value, |
| 21 | + t.type |
| 22 | + from unnest(jsonb_unnest_recursive_distinct.data) as u(data) |
| 23 | + cross join jsonb_typeof(u.data) as t(type) |
| 24 | + left join jsonb_each(case t.type when 'object' then u.data end) as o(obj_key, obj_value) on true |
| 25 | + left join jsonb_array_elements(case t.type when 'array' then u.data end) with ordinality as a(arr_value, arr_key) on true |
| 26 | + cross join coalesce(o.obj_key, (a.arr_key - 1)::text) as k(key) |
| 27 | + cross join coalesce(o.obj_value, a.arr_value) as v(value) |
| 28 | + where t.type in ('object', 'array') |
| 29 | + and k.key is not null |
| 30 | + union --all |
| 31 | + select |
| 32 | + array_append(r.path, k.key), |
| 33 | + v.value, |
| 34 | + t.type |
| 35 | + from r |
| 36 | + cross join jsonb_typeof(r.value) as t(type) |
| 37 | + left join jsonb_each(case t.type when 'object' then r.value end) as o(obj_key, obj_value) on true |
| 38 | + left join jsonb_array_elements(case t.type when 'array' then r.value end) with ordinality as a(arr_value, arr_key) on true |
| 39 | + cross join coalesce(o.obj_key, (a.arr_key - 1)::text) as k(key) |
| 40 | + cross join coalesce(o.obj_value, a.arr_value) as v(value) |
| 41 | + where t.type in ('object', 'array') |
| 42 | + and k.key is not null |
| 43 | + ) |
| 44 | + select r.* |
| 45 | + from r |
| 46 | + where jsonb_typeof(r.value) not in ('object', 'array'); |
| 47 | +$func$; |
| 48 | + |
| 49 | +comment on function public.jsonb_unnest_recursive_distinct(arr_data jsonb[]) |
| 50 | + is 'Recursive parse nested JSONs (arrays and objects), returns distinct keys and its values'; |
| 51 | + |
| 52 | +------------------------------------------------------------------------------------------------------------------------ |
| 53 | +--TEST |
| 54 | + |
| 55 | +do $$ |
| 56 | +begin |
| 57 | + assert (select count(*) = 9 |
| 58 | + from public.jsonb_unnest_recursive_distinct(array[ |
| 59 | + '{"id":123,"g":null,"a":[9,8,4,5],"name":"unknown", "7": 3}'::jsonb, |
| 60 | + '{"id":123,"g":null,"a":[9,8,4,5],"name":"unknown", "7": 3}'::jsonb, |
| 61 | + '{"id":123,"g":null,"a":[9,8,4,5],"name":"unknown", "7": 2}'::jsonb |
| 62 | + ]) |
| 63 | + ); |
| 64 | +end; |
| 65 | +$$; |
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