Hi all,
I found an error and stack trace occurred when I set a 'TextField' type
field to a 'group.field' parameter and got group facets.
According to the manual,we can set 'StrField' or 'TextField' type field to
'group.field' parameter.
(See
https://solr.apache.org/guide/solr/latest/query-guide/result-grouping.html)
So I just tried to set a 'TextField' type field to the 'group.field'
parameter. But the error occured.
The reproduction procedure using sample_techproducts is as follows.
1. Modify solrconfig.xml to show facets.
- Added 3 lines below the rows parameter
<requestHandler name="/select" class="solr.SearchHandler">
<lst name="defaults">
<str name="echoParams">explicit</str>
<int name="rows">10</int>
<str name="facet">on</str> <!-- added ->
<str name="facet.mincount">1</str> <!-- added ->
<str name="facet.limit">-1</str> <!-- added ->
</lst>
- Removed comments("<!--", "-->") and enabled the following
<lst name="invariants">
<str name="facet.field">cat</str>
<str name="facet.field">manu_exact</str>
<str name="facet.query">price:[* TO 500]</str>
<str name="facet.query">price:[500 TO *]</str>
</lst>
2. Modify managed-schema to define the manu_keyword field. The type of
manu_keyword field is Text.Field using only KeywordTokenizer.
- Add the following 7 lines just before the "</schema>"
<fieldType name="text_keyword" class="solr.TextField"
positionIncrementGap="100">
<analyzer>
<tokenizer class="solr.KeywordTokenizerFactory"/>
</analyzer>
</fieldType>
<field name="manu_keyword" type="text_keyword" stored="true"
indexed="true" docValues="false" multiValued="false" />
<copyField source="manu" dest="manu_keyword"/>
3. Indexing(re-index)
4. Execute this query
'http://localhost:8983/solr/techproducts/select?fl=id,name&q=solr+memory&gro
up=true&group.field=manu_keyword&group.facet=true'
5. The following error appears.
"msg":"unexpected docvalues type SORTED_SET for field 'manu_keyword'
(expected=SORTED). Re-index with correct docvalues type.",
"trace":"java.lang.IllegalStateException: unexpected docvalues type
SORTED_SET for field 'manu_keyword' (expected=SORTED). Re-index with correct
docvalues type.
at org.apache.lucene.index.DocValues.checkField(DocValues.java:218) ...
No error occurred when using
'http://localhost:8983/solr/techproducts/select?fl=id,name&q=solr+memory&gro
up=true&group.field=manu_exact&group.facet=true'
In addition, even if I re-index, it does not solve.
I guess only 'StrField' type field are allowed in the 'group.field'
parameter.
I have confirmed that this error occurs on Solr 8.11 and Solr 9.0.
I would be grateful if anyone could give me useful information.
