[jira] [Created] (SOLR-9738) Stats node not null if empty results

["Andrea Lovato (JIRA)" <ji...@apache.org>]

Andrea Lovato created SOLR-9738:
-----------------------------------

             Summary: Stats node not null if empty results
                 Key: SOLR-9738
                 URL: https://issues.apache.org/jira/browse/SOLR-9738
             Project: Solr
          Issue Type: Bug
      Security Level: Public (Default Security Level. Issues are Public)
    Affects Versions: 5.5.3
            Reporter: Andrea Lovato
            Priority: Minor


Hi all, 
first of all, you're doing a great job with solr, it's amazing :)
actually i'm workin' on updating solr to v4.6.1 to v5.5.3 on our production env and i notice that on v5.5.3 the stats node is not null if solr returns 0 results.
For example: request: <queryForEmptyRequest>&stats=true&stats.field=fa_p1
v5.5.3
  "response":{"numFound":0,"start":0,"docs":[]},
  "stats":{
    "stats_fields":{
      "fa_p1":{
        "min":null,
        "max":null,
        "count":0,
        "missing":0,
        "sum":0.0,
        "sumOfSquares":0.0,
        "mean":"NaN",
        "stddev":0.0}}}
v4.6.1
"response": {"numFound": 0,"start": 0,"docs": [ ]},
"stats": {
    "stats_fields": {
        "fa_p1": null
    }
}

but i've also noticed that if i disable the mean field on v5.5.3, the stats node for the field fa_p1 is empty

request:  <queryForEmptyRequest>&stats=true&stats.field={!mean=false}fa_p1

  "response":{"numFound":0,"start":0,"docs":[]},
  "stats":{
    "stats_fields":{
      "fa_p1":{}}}

Is this the correct behaviour? Or am i missing something?
thanks



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