Creating a table with dynamic json column - postgresql - sql

Question

I have 3 tables containing array columns: config_table, main_table and field_table. My objective is to get an output_table that can have variable column names (and obviosuly values) depending on what is configured in the config_table.
config_table:
type_id fields feild_ids
1 {A} {1}
1 {B,C} {2,3}
1 {D} {4}
main_table:
type_id value
1 12
1 34
2 56
2 78
3 99
field_table:
value field_data
12 {"1": "Hello",
"2": "foo",
"3": "bar",
"4": "Hi",
"5": "ignore_this",
"6": "ignore_this_too" }
34 {"1": "Iam",
"2": "out",
"3": "of",
"4": "words",
"5": "orange",
"6": "banana" }
56 ...
78 ...
99 ...
EDIT
Since having dynamic/variable column names will not be feasible, the ideal output_table format would be:
type_id value json_data
1 12 {"A": "Hello", "B-C": "foo-bar", D: "Hi"}
1 34 {"A": "Iam", "B-C": "out-of", D: "words"}
I am trying to realize a general solution that would allow me to create output_table for N values in a single "field_ids" in config_table.
EDIT 2
removed the redundant type column, added fields 5 and 6 to field_table.field_data as well as type_id 2 and 3 to main_table.type_id (which need to be ignored in output_table because of their absence in config_table) and to make the question easier to understand

Answer 1

This gave me the desired output:
select M.type_id,
M.value,
--F.field_data,
JSON_OBJECT(ARRAY( select TD.temp_keys
from ( select array_to_string(TMD.fields, '-') as temp_keys,
array_to_string(TMD.field_values, '-') as temp_values
from (select MC.fields,
MC.field_ids,
array(select TF.value
from jsonb_each_text(F.field_data) TF
where TF.key::integer = any(MC.field_ids)) as field_values
from config_table MC
--where MC.field_ids = any(F.fields)
) TMD
) TD
),
ARRAY( select TD.temp_values
from ( select array_to_string(TMD.fields, '-') as temp_keys,
array_to_string(TMD.field_values, '-') as temp_values
from (select MC.fields,
MC.field_ids,
array(select TF.value
from jsonb_each_text(F.field_data) TF
where TF.key::integer = any(MC.field_ids)) as field_values
from main_table MC
--where MC.field_ids = any(F.fields)
) TMD
) TD
)
)
from main_table M
inner join field_table F
on M.value = F.value
where M.type_id in (select distinct CC.type_id from config_table CC)