Sorry forgot to mention that this was Solr 8.11.1
From: Gerald Bonfiglio
Sent: Thursday, June 23, 2022 2:50 PM
To: [email protected]
Subject: Question/Issue regarding JSON Facet Stats functions with nested
function
I'm noticing some unexpected and undesirable behavior when using JSON Facet API
with Stats functions when using nested functions. Below is an example which
hopefully helps illustrate the behavior I'm seeing.
I have a JSON Facet string of the following:
json.facet={
"grp_0": {
"field": "ssnm",
"limit": -1,
"type": "terms",
"mincount": 1,
"refine": true,
"sort": {"index": "asc"},
"facet": {
"avg_TotalCpuUsec": "avg(TotalCpuUsec)",
"avg_sqrt_TotalCpuUsec": "avg(sqrt(TotalCpuUsec))",
"count_TotalCpuUsec": "countvals(TotalCpuUsec)",
"count_sqrt_TotalCpuUsec": "countvals(sqrt(TotalCpuUsec))",
"sum_TotalCpuUsec": "sum(TotalCpuUsec)",
"sum_sqrt_TotalCpuUsec": "sum(sqrt(TotalCpuUsec))"
}
}
}
And an example of one of the buckets returned is:
"facets":{
"count":32,
"grp_0":{
"buckets":[{
"val":"Activity",
"count":6,
"count_sqrt_TotalCpuUsec":6,
"sum_sqrt_TotalCpuUsec":495.29246931322893,
"count_TotalCpuUsec":4,
"sum_TotalCpuUsec":61464.399999999994,
"avg_TotalCpuUsec":15366.099999999999,
"avg_sqrt_TotalCpuUsec":82.54874488553816},
.
.
.
} ]}}}
Notice that there are 6 documents in the bucket, but only 4 of them have the
field "TotalCpuUsec", which is reflected in value for countvals(TotalCpuUsec).
My issue is with the calculation of avg(sqrt(TotalCpuUsec)). The calculation
of avg(TotalCpuUsec) is correct, equaling sum(TotalCpuUsec) / 4. However, the
value of avg(sqrt(TotalCpuUsec)) equals sum(sqrt(TotalCpuUsec)) / 6. I think
it should have been divided by 4, since only 4 documents have a value for this
field. It appears that sqrt(TotalCpuUsec) is returning 0.0 for documents that
don't have the field, so this 0.0 for the 2 documents is factoring into the avg
calculation, which seems to be reflected by the value of
countvals(sqrt(TotalCpuUsec)), which is 6.
This seems like a bug, but wanted to reach out to see if this is "working as
expected" and if there are some facet attributes that can be set to work around
this.
[Nastel Technologies]<http://www.nastel.com/>
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