Mixing
How to implement Solr's facet.missing=true with Lucene
Solr supports returning the number of matching documents with no facet value for the field. How can the same be achieved with Lucene?
Example: I have 5 documents that may have values for the a field category
- Document 1 has
category=A
- Document 2 has
category=Aandcategory=B
- Document 3 has
category=Bandcategory=C
- Document 4 and 5 have no
categoryvalues
The code looks like
var facetsCollector = new FacetsCollector();
FacetsCollector.Search(_indexSearcher, new MatchAllDocsQuery(), 100, facetsCollector);
var state = DefaultSortedSetDocValuesReaderState(_indexReader, "category_facet");
var facets = SortedSetDocValuesFacetCounts(state, facetsCollector);
var children = facets.GetTopChildren(100, "category_dim");
This gives me LabelValues
- Label:A, Value:2
- Label:B, Value:2
- Label:C, Value:1
How can I determine "Label:(missing), Value:2"?
Running another query +*:* -category:* is an obvious option. However, can it be done in a smarter way?
lucene facet
asked Nov 19 '18 at 12:19
Paul B.
1,7301839
add a comment |
Solr supports returning the number of matching documents with no facet value for the field. How can the same be achieved with Lucene?
Example: I have 5 documents that may have values for the a field category
- Document 1 has
category=A
- Document 2 has
category=Aandcategory=B
- Document 3 has
category=Bandcategory=C
- Document 4 and 5 have no
categoryvalues
The code looks like
var facetsCollector = new FacetsCollector();
FacetsCollector.Search(_indexSearcher, new MatchAllDocsQuery(), 100, facetsCollector);
var state = DefaultSortedSetDocValuesReaderState(_indexReader, "category_facet");
var facets = SortedSetDocValuesFacetCounts(state, facetsCollector);
var children = facets.GetTopChildren(100, "category_dim");
This gives me LabelValues
- Label:A, Value:2
- Label:B, Value:2
- Label:C, Value:1
How can I determine "Label:(missing), Value:2"?
Running another query +*:* -category:* is an obvious option. However, can it be done in a smarter way?
lucene facet
asked Nov 19 '18 at 12:19
Paul B.
1,7301839
add a comment |
Solr supports returning the number of matching documents with no facet value for the field. How can the same be achieved with Lucene?
Example: I have 5 documents that may have values for the a field category
- Document 1 has
category=A
- Document 2 has
category=Aandcategory=B
- Document 3 has
category=Bandcategory=C
- Document 4 and 5 have no
categoryvalues
The code looks like
var facetsCollector = new FacetsCollector();
FacetsCollector.Search(_indexSearcher, new MatchAllDocsQuery(), 100, facetsCollector);
var state = DefaultSortedSetDocValuesReaderState(_indexReader, "category_facet");
var facets = SortedSetDocValuesFacetCounts(state, facetsCollector);
var children = facets.GetTopChildren(100, "category_dim");
This gives me LabelValues
- Label:A, Value:2
- Label:B, Value:2
- Label:C, Value:1
How can I determine "Label:(missing), Value:2"?
Running another query +*:* -category:* is an obvious option. However, can it be done in a smarter way?
lucene facet
asked Nov 19 '18 at 12:19
Paul B.
1,7301839
Solr supports returning the number of matching documents with no facet value for the field. How can the same be achieved with Lucene?
Example: I have 5 documents that may have values for the a field category
- Document 1 has
category=A
- Document 2 has
category=Aandcategory=B
- Document 3 has
category=Bandcategory=C
- Document 4 and 5 have no
categoryvalues
The code looks like
var facetsCollector = new FacetsCollector();
FacetsCollector.Search(_indexSearcher, new MatchAllDocsQuery(), 100, facetsCollector);
var state = DefaultSortedSetDocValuesReaderState(_indexReader, "category_facet");
var facets = SortedSetDocValuesFacetCounts(state, facetsCollector);
var children = facets.GetTopChildren(100, "category_dim");
This gives me LabelValues
- Label:A, Value:2
- Label:B, Value:2
- Label:C, Value:1
How can I determine "Label:(missing), Value:2"?
Running another query +*:* -category:* is an obvious option. However, can it be done in a smarter way?
lucene facet
lucene facet
asked Nov 19 '18 at 12:19
Paul B.
1,7301839
asked Nov 19 '18 at 12:19
Paul B.
1,7301839
asked Nov 19 '18 at 12:19
Paul B.
1,7301839
asked Nov 19 '18 at 12:19
Paul B.
1,7301839
asked Nov 19 '18 at 12:19
Paul B.
1,7301839
1,7301839
add a comment |
add a comment |
1 Answer
1
active
oldest
votes
Solr facet.missing functionality is done without any collectors by just doing this:
SchemaField sf = searcher.getSchema().getField(fieldName);
DocSet hasVal = searcher.getDocSet(sf.getType().getRangeQuery(null, sf, null, null, false, false));
return docs.andNotSize(hasVal);
which basically means - use the docset that was provided earlier by the search, get another docset by running range query which is finding only documents with missing values and then applying simple boolean operation.
Unfortunately, Lucene doesn't have built-in DocSet functionality so it would require some tricks. I could come up with something like this:
Query q = some Lucene query
Set<Integer> queryRes = new HashSet<>();
searcher.search(q, new CheckHits.SetCollector(queryRes));
Set<Integer> missingRes = new HashSet<>();
searcher.search(new TermRangeQuery("category", null, null, false, false), new CheckHits.SetCollector(missingRes));
missingRes.retainAll(queryRes);
System.out.println(missingRes.size());
HashSet retain functionality should be pretty okay in terms of speed. If further needed, this collector could be extended to store ids in somewhere more efficient way
Full example could be found there
answered Dec 28 '18 at 15:22
Mysterion
5,90221942
add a comment |
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1 Answer
1
active
oldest
votes
1 Answer
1
active
oldest
votes
active
oldest
votes
active
oldest
votes
Solr facet.missing functionality is done without any collectors by just doing this:
SchemaField sf = searcher.getSchema().getField(fieldName);
DocSet hasVal = searcher.getDocSet(sf.getType().getRangeQuery(null, sf, null, null, false, false));
return docs.andNotSize(hasVal);
which basically means - use the docset that was provided earlier by the search, get another docset by running range query which is finding only documents with missing values and then applying simple boolean operation.
Unfortunately, Lucene doesn't have built-in DocSet functionality so it would require some tricks. I could come up with something like this:
Query q = some Lucene query
Set<Integer> queryRes = new HashSet<>();
searcher.search(q, new CheckHits.SetCollector(queryRes));
Set<Integer> missingRes = new HashSet<>();
searcher.search(new TermRangeQuery("category", null, null, false, false), new CheckHits.SetCollector(missingRes));
missingRes.retainAll(queryRes);
System.out.println(missingRes.size());
HashSet retain functionality should be pretty okay in terms of speed. If further needed, this collector could be extended to store ids in somewhere more efficient way
Full example could be found there
answered Dec 28 '18 at 15:22
Mysterion
5,90221942
add a comment |
Solr facet.missing functionality is done without any collectors by just doing this:
SchemaField sf = searcher.getSchema().getField(fieldName);
DocSet hasVal = searcher.getDocSet(sf.getType().getRangeQuery(null, sf, null, null, false, false));
return docs.andNotSize(hasVal);
which basically means - use the docset that was provided earlier by the search, get another docset by running range query which is finding only documents with missing values and then applying simple boolean operation.
Unfortunately, Lucene doesn't have built-in DocSet functionality so it would require some tricks. I could come up with something like this:
Query q = some Lucene query
Set<Integer> queryRes = new HashSet<>();
searcher.search(q, new CheckHits.SetCollector(queryRes));
Set<Integer> missingRes = new HashSet<>();
searcher.search(new TermRangeQuery("category", null, null, false, false), new CheckHits.SetCollector(missingRes));
missingRes.retainAll(queryRes);
System.out.println(missingRes.size());
HashSet retain functionality should be pretty okay in terms of speed. If further needed, this collector could be extended to store ids in somewhere more efficient way
Full example could be found there
answered Dec 28 '18 at 15:22
Mysterion
5,90221942
add a comment |
Solr facet.missing functionality is done without any collectors by just doing this:
SchemaField sf = searcher.getSchema().getField(fieldName);
DocSet hasVal = searcher.getDocSet(sf.getType().getRangeQuery(null, sf, null, null, false, false));
return docs.andNotSize(hasVal);
which basically means - use the docset that was provided earlier by the search, get another docset by running range query which is finding only documents with missing values and then applying simple boolean operation.
Unfortunately, Lucene doesn't have built-in DocSet functionality so it would require some tricks. I could come up with something like this:
Query q = some Lucene query
Set<Integer> queryRes = new HashSet<>();
searcher.search(q, new CheckHits.SetCollector(queryRes));
Set<Integer> missingRes = new HashSet<>();
searcher.search(new TermRangeQuery("category", null, null, false, false), new CheckHits.SetCollector(missingRes));
missingRes.retainAll(queryRes);
System.out.println(missingRes.size());
HashSet retain functionality should be pretty okay in terms of speed. If further needed, this collector could be extended to store ids in somewhere more efficient way
Full example could be found there
answered Dec 28 '18 at 15:22
Mysterion
5,90221942
Solr facet.missing functionality is done without any collectors by just doing this:
SchemaField sf = searcher.getSchema().getField(fieldName);
DocSet hasVal = searcher.getDocSet(sf.getType().getRangeQuery(null, sf, null, null, false, false));
return docs.andNotSize(hasVal);
which basically means - use the docset that was provided earlier by the search, get another docset by running range query which is finding only documents with missing values and then applying simple boolean operation.
Unfortunately, Lucene doesn't have built-in DocSet functionality so it would require some tricks. I could come up with something like this:
Query q = some Lucene query
Set<Integer> queryRes = new HashSet<>();
searcher.search(q, new CheckHits.SetCollector(queryRes));
Set<Integer> missingRes = new HashSet<>();
searcher.search(new TermRangeQuery("category", null, null, false, false), new CheckHits.SetCollector(missingRes));
missingRes.retainAll(queryRes);
System.out.println(missingRes.size());
HashSet retain functionality should be pretty okay in terms of speed. If further needed, this collector could be extended to store ids in somewhere more efficient way
Full example could be found there
answered Dec 28 '18 at 15:22
Mysterion
5,90221942
answered Dec 28 '18 at 15:22
Mysterion
5,90221942
answered Dec 28 '18 at 15:22
Mysterion
5,90221942
answered Dec 28 '18 at 15:22
Mysterion
5,90221942
5,90221942
add a comment |
add a comment |
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