Spring-Data-SOLR: Stats result on SimpleQuery won't return me distinct calcs

Question

I'm trying to use a SimpleQuery to get distinct result from my solr collection, but even after setting my StatsOption with calcDistinct true, I can't get the result I want.

BTW I'm using spring-data-solr-2.1.4.RELEASE.

SampleCode:

Field field = new SimpleField("fieldName");
StatsOptions statsOptions = new StatsOptions().addField(field).setCalcDistinct(true);
SimpleQuery query = new SimpleQuery("*:*").setStatsOptions(statsOptions);
StatsPage<MyClass> statsPage = solrTemplate.queryForStatsPage(query, MyClass.class);
FieldStatsResult statsResult = statsPage.getFieldStatsResult(field);
Collection<Object> distinctValues = statsResult.getDistinctValues();
Set<String> result = distinctValues.stream().map((i) -> i.toString()).collect(Collectors.toSet());
return result;

After trying the above code, all I get is the max, min, count, but no results for distinct totals or distinct values.

What am I doing wrong in this sample?

Answer 1

Looks like your disctintValues collection is also an implementation of EmptyList which means that there are no values in the response.

Check if your query returns any result, first.

Answer 2

StatsOptions statsOptions = new StatsOptions().addField(field).setSelectiveCalcDistinct(true).setCalcDistinct(true);

The processStatsOptions method in org.springframework.data.solr.core.DefaultQueryParser is described as follows :

Boolean selectiveCountDistincts = statsOptions.isSelectiveCalcDistincts(field);

if (selectiveCountDistincts != null) {

  solrQuery.add(selectiveCalcDistinctParam, String.valueOf(selectiveCountDistincts.booleanValue()));

}