[SOLR-9738] Stats node not null if empty results

• Type: Bug
• Status: Open
• Priority: Minor
• Resolution: Unresolved
• Affects Version/s: 5.5.3
• Labels: beginner empty stats test
• Assignee: Unassigned
• Reporter: Andrea Lovato
• Created: 08/Nov/16 10:10
• Updated: 08/Jun/19 15:33

Description

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