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When using Lucene's {{SortField.Type.INT}} to sort on a field which was not indexed as a NumericField, the resulting error message is confusing:
{noformat}java.lang.IllegalStateException: Type mismatch: ageForIntSorting was indexed with multiple values per document, use SORTED_SET instead
at org.apache.lucene.uninverting.FieldCacheImpl$SortedDocValuesCache.createValue(FieldCacheImpl.java:679)
at org.apache.lucene.uninverting.FieldCacheImpl$Cache.get(FieldCacheImpl.java:190)
at org.apache.lucene.uninverting.FieldCacheImpl.getTermsIndex(FieldCacheImpl.java:647)
at org.apache.lucene.uninverting.FieldCacheImpl.getTermsIndex(FieldCacheImpl.java:627)
at org.apache.lucene.uninverting.UninvertingReader.getSortedDocValues(UninvertingReader.java:257)
at org.apache.lucene.index.DocValues.getSorted(DocValues.java:262)
at org.apache.lucene.search.FieldComparator$TermOrdValComparator.getSortedDocValues(FieldComparator.java:757)
at org.apache.lucene.search.FieldComparator$TermOrdValComparator.getLeafComparator(FieldComparator.java:762)
at org.apache.lucene.search.FieldValueHitQueue.getComparators(FieldValueHitQueue.java:183)
at org.apache.lucene.search.TopFieldCollector$NonScoringCollector.getLeafCollector(TopFieldCollector.java:141)
at org.apache.lucene.search.IndexSearcher.search(IndexSearcher.java:762)
at org.apache.lucene.search.IndexSearcher.search(IndexSearcher.java:485)
at org.apache.lucene.search.IndexSearcher.search(IndexSearcher.java:473)
at org.hibernate.search.query.engine.impl.LazyQueryState.search(LazyQueryState.java:100)
at org.hibernate.search.query.engine.impl.QueryHits.updateTopDocs(QueryHits.java:250)
at org.hibernate.search.query.engine.impl.QueryHits.<init>(QueryHits.java:145)
at org.hibernate.search.query.engine.impl.QueryHits.<init>(QueryHits.java:123)
at org.hibernate.search.query.engine.impl.HSQueryImpl.getQueryHits(HSQueryImpl.java:447)
at org.hibernate.search.query.engine.impl.HSQueryImpl.queryEntityInfos(HSQueryImpl.java:268)
{noformat}
Wondering if we could improve on that, as this might be a migration issue: it seems previously - before Lucene 5 - this was more lenient (probably gave the wrong sort order, but it would not throw an exception).
A starting point it the test {{org.hibernate.search.test.sorting.SortingTest}} (about to be committed).
The opposite problem will result in something like:
{noformat}java.lang.IllegalStateException: Type mismatch: age was indexed with multiple values per document, use SORTED_SET instead
at org.apache.lucene.uninverting.FieldCacheImpl$SortedDocValuesCache.createValue(FieldCacheImpl.java:679) ~[lucene-misc-5.2.1.jar:5.2.1 1684708 - shalin - 2015-06-10 23:11:46]
at org.apache.lucene.uninverting.FieldCacheImpl$Cache.get(FieldCacheImpl.java:190) ~[lucene-misc-5.2.1.jar:5.2.1 1684708 - shalin - 2015-06-10 23:11:46]
at org.apache.lucene.uninverting.FieldCacheImpl.getTermsIndex(FieldCacheImpl.java:647) ~[lucene-misc-5.2.1.jar:5.2.1 1684708 - shalin - 2015-06-10 23:11:46]
at org.apache.lucene.uninverting.FieldCacheImpl.getTermsIndex(FieldCacheImpl.java:627) ~[lucene-misc-5.2.1.jar:5.2.1 1684708 - shalin - 2015-06-10 23:11:46]
at org.apache.lucene.uninverting.UninvertingReader.getSortedDocValues(UninvertingReader.java:257) ~[lucene-misc-5.2.1.jar:5.2.1 1684708 - shalin - 2015-06-10 23:11:46]
at org.apache.lucene.index.DocValues.getSorted(DocValues.java:262) ~[lucene-core-5.2.1.jar:5.2.1 1684708 - shalin - 2015-06-10 23:11:06]
at org.apache.lucene.search.FieldComparator$TermOrdValComparator.getSortedDocValues(FieldComparator.java:757) ~[lucene-core-5.2.1.jar:5.2.1 1684708 - shalin - 2015-06-10 23:11:06]
at org.apache.lucene.search.FieldComparator$TermOrdValComparator.getLeafComparator(FieldComparator.java:762) ~[lucene-core-5.2.1.jar:5.2.1 1684708 - shalin - 2015-06-10 23:11:06]
at org.apache.lucene.search.FieldValueHitQueue.getComparators(FieldValueHitQueue.java:183) ~[lucene-core-5.2.1.jar:5.2.1 1684708 - shalin - 2015-06-10 23:11:06]
at org.apache.lucene.search.TopFieldCollector$NonScoringCollector.getLeafCollector(TopFieldCollector.java:141) ~[lucene-core-5.2.1.jar:5.2.1 1684708 - shalin - 2015-06-10 23:11:06]
at org.apache.lucene.search.IndexSearcher.search(IndexSearcher.java:762) ~[lucene-core-5.2.1.jar:5.2.1 1684708 - shalin - 2015-06-10 23:11:06]
at org.apache.lucene.search.IndexSearcher.search(IndexSearcher.java:485) ~[lucene-core-5.2.1.jar:5.2.1 1684708 - shalin - 2015-06-10 23:11:06]
at org.apache.lucene.search.IndexSearcher.search(IndexSearcher.java:473) ~[lucene-core-5.2.1.jar:5.2.1 1684708 - shalin - 2015-06-10 23:11:06]
at org.hibernate.search.query.engine.impl.LazyQueryState.search(LazyQueryState.java:100) ~[hibernate-search-engine-5.5.0-SNAPSHOT.jar:5.5.0-SNAPSHOT]
at org.hibernate.search.query.engine.impl.QueryHits.updateTopDocs(QueryHits.java:250) ~[hibernate-search-engine-5.5.0-SNAPSHOT.jar:5.5.0-SNAPSHOT]
at org.hibernate.search.query.engine.impl.QueryHits.<init>(QueryHits.java:145) ~[hibernate-search-engine-5.5.0-SNAPSHOT.jar:5.5.0-SNAPSHOT]
at org.hibernate.search.query.engine.impl.QueryHits.<init>(QueryHits.java:114) ~[hibernate-search-engine-5.5.0-SNAPSHOT.jar:5.5.0-SNAPSHOT]
at org.hibernate.search.query.engine.impl.HSQueryImpl.getQueryHits(HSQueryImpl.java:452) ~[hibernate-search-engine-5.5.0-SNAPSHOT.jar:5.5.0-SNAPSHOT]
at org.hibernate.search.query.engine.impl.HSQueryImpl.queryEntityInfos(HSQueryImpl.java:268) ~[hibernate-search-engine-5.5.0-SNAPSHOT.jar:5.5.0-SNAPSHOT]
{noformat}
I suspect in this case the field was indexed as NumericField, but it's being queried as {{SortField.Type.STRING}}
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