gsmiller commented on code in PR #974:
URL: https://github.com/apache/lucene/pull/974#discussion_r910485371
##########
lucene/demo/src/java/org/apache/lucene/demo/facet/DistanceFacetsExample.java:
##########
@@ -212,7 +212,26 @@ public static Query getBoundingBoxQuery(
}
/** User runs a query and counts facets. */
- public FacetResult search() throws IOException {
+ public FacetResult searchAllChildren() throws IOException {
+
+ FacetsCollector fc = searcher.search(new MatchAllDocsQuery(), new
FacetsCollectorManager());
+
+ Facets facets =
+ new DoubleRangeFacetCounts(
+ "field",
+ getDistanceValueSource(),
+ fc,
+ getBoundingBoxQuery(ORIGIN_LATITUDE, ORIGIN_LONGITUDE, 10.0),
+ ONE_KM,
+ TWO_KM,
+ FIVE_KM,
+ TEN_KM);
+
+ return facets.getAllChildren("field");
+ }
+
+ /** User runs a query and counts facets. */
+ public FacetResult searchTopChildren() throws IOException {
Review Comment:
Yeah maybe. I think if you can come up with a real-world example that has a
somewhat high cardinality of children but where you only want a small subset,
then building an example around that could be useful. Here's one I just thought
of, but maybe you can come up with something else?
What if, as an example, you indexed error messages in a service log so you
could do analysis over them. Each document could be an error log entry that
contains the log message string and also a timestamp for when it occurred. Then
let's say you wanted to find the top 5 hour periods that had the most errors
over the past week. To do this, you could create 168 ranges (each for a one
hour time period; 7 * 24 = 268) and facet on them. Then you could ask for the
top-5 by count. That would give you the five hour periods over the last week
with the most errors.
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