[jira] Created: (COUCHDB-83) undefined in an array as a key causes an Erlang error

[Ryszard Szopa (JIRA)]

undefined in an array as a key causes an Erlang error
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                 Key: COUCHDB-83
                 URL: https://issues.apache.org/jira/browse/COUCHDB-83
             Project: CouchDB
          Issue Type: Bug
          Components: JavaScript View Server
    Affects Versions: 0.7.2, 0.8
            Reporter: Ryszard Szopa


Whenever a view emits an array containing undefined as a key an Erlang is 
thrown:

For example, if there's at least one document in the db without foo being set, 
the following view

function(doc) {
  emit([doc.foo], doc);
}

triggers

{{nocatch,{bad_value,"Cannot encode 'undefined' value as JSON"}},
 [{couch_query_servers,prompt,2},
  {couch_query_servers,'-map_docs/2-fun-0-',2},
  {lists,map,2},
  {couch_query_servers,map_docs,2},
  {couch_view,view_compute,2},
  {couch_view,update_group,1},
  {couch_view,temp_update_loop,2}]}

OTOH, 

function(doc) {
  emit(doc.foo, doc);
}

causes no problems.

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