unnset json array

[Liorba]

Hey all,
it seems that unnesting json array which contains a list of maps is impossible
see the example below

 select x.n
 from
 unnest(cast(json_extract('{"payload":[{"type":"b","value":"9"}, {"type":"a","value":"8"}]}','$.payload') as 
 array<varchar>)) as  x(n)

I get an error:
Query failed (#20151228_081622_00006_w4si4) Value cannot be cast to array<varchar>

[cawallin]

This looks like a Presto issue, rather than a presto-admin issue -- can you file the issue there? https://github.com/facebook/presto/issues