Trejkaz created LUCENE-6826:
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Summary: java.lang.ClassCastException:
org.apache.lucene.index.TermsEnum$2 cannot be cast to
org.apache.lucene.index.MultiTermsEnum when adding indexes
Key: LUCENE-6826
URL: https://issues.apache.org/jira/browse/LUCENE-6826
Project: Lucene - Core
Issue Type: Bug
Components: core/index
Affects Versions: 5.2.1
Reporter: Trejkaz
We are using addIndexes and FilterCodecReader tricks as part of index migration.
Whether FilterCodecReader tricks are required to reproduce this is uncertain,
but in any case, when migrating a particular index, I saw this exception:
{noformat}
java.lang.ClassCastException: org.apache.lucene.index.TermsEnum$2 cannot be
cast to org.apache.lucene.index.MultiTermsEnum
at
org.apache.lucene.index.MappedMultiFields$MappedMultiTerms.iterator(MappedMultiFields.java:65)
at
org.apache.lucene.codecs.blocktree.BlockTreeTermsWriter.write(BlockTreeTermsWriter.java:426)
at
org.apache.lucene.codecs.perfield.PerFieldPostingsFormat$FieldsWriter.write(PerFieldPostingsFormat.java:198)
at
org.apache.lucene.codecs.FieldsConsumer.merge(FieldsConsumer.java:105)
at
org.apache.lucene.index.SegmentMerger.mergeTerms(SegmentMerger.java:193)
at org.apache.lucene.index.SegmentMerger.merge(SegmentMerger.java:95)
at org.apache.lucene.index.IndexWriter.addIndexes(IndexWriter.java:2519)
{noformat}
TermsEnum$2 appears to be TermsEnum.EMPTY. The place where it creates it is
here:
MultiTermsEnum#reset:
{code}
if (queue.size() == 0) {
return TermsEnum.EMPTY; // <- this is not a MultiTermsEnum
} else {
return this;
}
{code}
A quick hack would be for MappedMultiFields to check for TermsEnum.EMPTY
specifically before casting, but there might be some way to avoid the cast
entirely and that would obviously be a better idea.
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