I just happen to notice that (*:*) is not parsed properly by edismax in 4.0-beta. It appears to require spaces before and after the *:*, otherwise it treats the colon as part of a wildcard term (see the escaping below). I haven’t tried other releases yet.
Some variations I tried: <str name="rawquerystring">(*:*)</str> <str name="querystring">(*:*)</str> <str name="parsedquery">(+DisjunctionMaxQuery((text:*\:*)))/no_coord</str> <str name="parsedquery_toString">+(text:*\:*)</str> <lst name="explain"/> <str name="QParser">ExtendedDismaxQParser</str> <str name="rawquerystring">( *:*)</str> <str name="querystring">( *:*)</str> <str name="parsedquery">(+DisjunctionMaxQuery((text:*\:*)))/no_coord</str> <str name="parsedquery_toString">+(text:*\:*)</str> <lst name="explain"/> <str name="QParser">ExtendedDismaxQParser</str> <str name="rawquerystring">(*:* )</str> <str name="querystring">(*:* )</str> <str name="parsedquery">(+DisjunctionMaxQuery((text:*\:*)))/no_coord</str> <str name="parsedquery_toString">+(text:*\:*)</str> <lst name="explain"/> <str name="QParser">ExtendedDismaxQParser</str> <str name="rawquerystring">( *:* )</str> <str name="querystring">( *:* )</str> <str name="parsedquery">(+MatchAllDocsQuery(*:*))/no_coord</str> <str name="parsedquery_toString">+*:*</str> <lst name="explain"/> <str name="QParser">ExtendedDismaxQParser</str> <str name="rawquerystring">(*:* -fox)</str> <str name="querystring">(*:* -fox)</str> <str name="parsedquery"> (+(DisjunctionMaxQuery((text:*\:*)) -DisjunctionMaxQuery((text:fox))))/no_coord </str> <str name="parsedquery_toString">+((text:*\:*) -(text:fox))</str> <lst name="explain"/> <str name="QParser">ExtendedDismaxQParser</str> <str name="rawquerystring">( *:* -fox)</str> <str name="querystring">( *:* -fox)</str> <str name="parsedquery"> (+(MatchAllDocsQuery(*:*) -DisjunctionMaxQuery((text:fox))))/no_coord </str> <str name="parsedquery_toString">+(*:* -(text:fox))</str> <lst name="explain"/> <str name="QParser">ExtendedDismaxQParser</str> I’ll file a Jira later today. -- Jack Krupansky
