Why does edismax resets field level wild query to *:*

[rajani m]

Hi Solr Users,

     Why does edismax query reset field exist query to *:*?  Is this
expected behavior or a bug?

 Edismax query "q": "{!edismax qf=keywords v='*'}" or in the other
form "q=*&qf=keywords.en&defType=edismax"
I expected this to translate into keywords:*

Parser debug query response is as follows
"parsedquery": "+MatchAllDocsQuery(*:*)","parsedquery_toString": "+*:*","
QParser": "ExtendedDismaxQParser",