Hi As far as I see there is one basic update function for jsonb, that can't be covered by `jsonb_set` - insert a new value into an array at arbitrary position. Using `jsonb_set` function we can only append into array at the end/at the beginning, and it looks more like a hack:
```
=# select jsonb_set('{"a": [1, 2, 3]}', '{a, 100}', '4');
jsonb_set
---------------------
{"a": [1, 2, 3, 4]}
(1 row)
=# select jsonb_set('{"a": [1, 2, 3]}', '{a, -100}', '4');
jsonb_set
---------------------
{"a": [4, 1, 2, 3]}
(1 row)
```
I think the possibility to insert into arbitrary position will be quite
useful,
something like `json_array_insert` in MySql:
```
mysql> set @j = '["a", {"b": [1, 2]}, [3, 4]]';
mysql> select json_array_insert(@j, '$[1].b[0]', 'x');
json_array_insert(@j, '$[1].b[0]', 'x')
+-----------------------------------------+
["a", {"b": ["x", 1, 2]}, [3, 4]]
```
It can look like `jsonb_insert` function in our case:
```
=# select jsonb_insert('{"a": [0,1,2]}', '{a, 1}', '"new_value"');
jsonb_insert
-------------------------------
{"a": [0, "new_value", 1, 2]}
(1 row)
```
I attached possible implementation, which is basically quite small (all
logic-related
modifications is only about 4 lines in `setPath` function). This
implementation
assumes a flag to separate "insert before"/"insert after" operations, and an
alias to `jsonb_set` in case if we working with a jsonb object, not an
array.
What do you think about this?
jsonb_insert.patch
Description: Binary data
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