Rasql_hierarchical metadata as extra parameters of encode()

[Bang Pham Huu]

Currently, "metadata" as extra parameters in JSON of encode() can be a map of string:string only, e.g:

select encode(c, "tiff", "{ 
\"metadata\": { \"new_metadata\": \"This is a new added metadata\"  }")
from mr2 as c

It could be good if "metadata" can support value not only string (current error is: rasdaman error 0: Type is not convertible to string, but a JSON object or JSON array, e.g:

select
encode(c, "tiff", "{ 
\"metadata\": { \"new_metadata\": [\"value1\", \"value2\" }")
from mr2 as c

select
encode(c, "tiff", "{ 
\"metadata\": { \"new_metadata\": { \"key1\": \"value1\"} }")
from mr2 as c

[Dimitar Misev]

How should this metadata be encoded?

In GDAL only flat key/value pairs is possible as far as I know. Should be similar in netcdf.

[Dimitar Misev]

Closing as wontfix as the formats don't support hierarchical metadata anyway (unless proven otherwise ).
The user/client should make sure to arrange the metadata as key/value pairs in whatever way they thing it's best.