yuanyun.cn created SOLR-4240:
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Summary: Stats response always shows one extra empty facets
element in Solr 4.0.
Key: SOLR-4240
URL: https://issues.apache.org/jira/browse/SOLR-4240
Project: Solr
Issue Type: Bug
Components: SearchComponents - other
Reporter: yuanyun.cn
Priority: Minor
Fix For: 4.1
If I don't specify stats.facet, it still shows one extra facets element.
http://localhost:8888/solr/select?q=*:*&rows=0&stats=true&stats.field=szkb
{code:xml}
<lst name="stats">
<lst name="stats_fields">
<lst name="szkb">
<double name="min">1.0</double>
<double name="max">3.0</double>
<long name="count">4980</long>
<long name="missing">0</long>
<double name="sum">10369.0</double>
<double name="sumOfSquares">22637.0</double>
<double name="mean">2.082128514056225</double>
<double name="stddev">0.4586561046404609</double>
<lst name="facets"/> ===> extra facets elment
</lst>
</lst>
</lst>
{code}
If I specify stats.facet, then for each facet value, it shows one extra facets
element.
http://localhost:8888/solr/select?q=*:*&rows=0&stats=true&stats.field=szkb&stats.facet=filetype
{code:xml}
<lst name="facets">
<lst name="filetype">
<lst name="ppt">
<double name="min">1.0</double>
<double name="max">1.0</double>
<long name="count">1</long>
<long name="missing">0</long>
<double name="sum">1.0</double>
<double name="sumOfSquares">1.0</double>
<double name="mean">1.0</double>
<double name="stddev">0.0</double>
<lst name="facets"/> ===> extra facets elment, this is
bad.
</lst>
</lst>
</lst>
{code}
The empty facets elment is no use, and annoying.
The culprit is the code:
org.apache.solr.handler.component.AbstractStatsValues.getStatsValues()
{code:title=StatsValuesFactory.java|borderStyle=solid}
public NamedList<?> getStatsValues() {
// add the facet stats
===> Here it always adds facets, in stead, it should check whether it is
empty: if (!facets.isEmpty())
NamedList<NamedList<?>> nl = new SimpleOrderedMap<NamedList<?>>();
for (Map.Entry<String, Map<String, StatsValues>> entry : facets.entrySet()) {
NamedList<NamedList<?>> nl2 = new SimpleOrderedMap<NamedList<?>>();
nl.add(entry.getKey(), nl2);
for (Map.Entry<String, StatsValues> e2 : entry.getValue().entrySet()) {
nl2.add(e2.getKey(), e2.getValue().getStatsValues());
}
}
res.add(FACETS, nl);
return res;
}
{code}
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