benwtrent commented on issue #12895:
URL: https://github.com/apache/lucene/issues/12895#issuecomment-1847568572
Here are some exceptions ran into when trying to do multi-term queries with
Lucene 9.9 against an index created in 9.8 or before:
```
Caused by: java.lang.ArrayIndexOutOfBoundsException: Index 4 out of bounds
for length 4
at
org.apache.lucene.store.ByteArrayDataInput.readVInt(ByteArrayDataInput.java:112)
at
org.apache.lucene.codecs.lucene90.blocktree.IntersectTermsEnumFrame.load(IntersectTermsEnumFrame.java:158)
at
org.apache.lucene.codecs.lucene90.blocktree.IntersectTermsEnumFrame.load(IntersectTermsEnumFrame.java:149)
at
org.apache.lucene.codecs.lucene90.blocktree.IntersectTermsEnum.pushFrame(IntersectTermsEnum.java:203)
at
org.apache.lucene.codecs.lucene90.blocktree.IntersectTermsEnum._next(IntersectTermsEnum.java:531)
at
org.apache.lucene.codecs.lucene90.blocktree.IntersectTermsEnum.next(IntersectTermsEnum.java:373)
at
org.apache.lucene.index.FilterLeafReader$FilterTermsEnum.next(FilterLeafReader.java:201)
```
```
Caused by: org.apache.lucene.index.CorruptIndexException: Illegal code for a
compression algorithm: 3 (resource=SearchIndexInput{[(clone of)
_3e4i_Lucene90_0.tim], context=IOContext [context=READ, mergeInfo=null,
flushInfo=null, readOnce=false],
cacheFile=SharedCacheFile{cacheKey=FileCacheKey[shardId=[.ds-logs-endpoint.events.file-default-2023.11.22-000002][0],
primaryTerm=3, fileName=stateless_commit_61353], length=3174808501},
length=308358826, offset=181596})
at
org.apache.lucene.core@9.9.0/org.apache.lucene.codecs.lucene90.blocktree.IntersectTermsEnumFrame.load(IntersectTermsEnumFrame.java:196)
at
org.apache.lucene.core@9.9.0/org.apache.lucene.codecs.lucene90.blocktree.IntersectTermsEnumFrame.loadNextFloorBlock(IntersectTermsEnumFrame.java:119)
at
org.apache.lucene.core@9.9.0/org.apache.lucene.codecs.lucene90.blocktree.IntersectTermsEnum.popPushNext(IntersectTermsEnum.java:339)
at
org.apache.lucene.core@9.9.0/org.apache.lucene.codecs.lucene90.blocktree.IntersectTermsEnum._next(IntersectTermsEnum.java:543)
at
org.apache.lucene.core@9.9.0/org.apache.lucene.codecs.lucene90.blocktree.IntersectTermsEnum.next(IntersectTermsEnum.java:373)
at
org.apache.lucene.core@9.9.0/org.apache.lucene.index.FilterLeafReader$FilterTermsEnum.next(FilterLeafReader.java:201)
```
```
Caused by: java.lang.NullPointerException: Cannot invoke
"org.apache.lucene.util.fst.FST$Arc.output()" because "arc" is null
at
org.apache.lucene.codecs.lucene90.blocktree.IntersectTermsEnum.pushFrame(IntersectTermsEnum.java:196)
at
org.apache.lucene.codecs.lucene90.blocktree.IntersectTermsEnum._next(IntersectTermsEnum.java:531)
at
org.apache.lucene.codecs.lucene90.blocktree.IntersectTermsEnum.next(IntersectTermsEnum.java:373)
at
org.apache.lucene.index.FilterLeafReader$FilterTermsEnum.next(FilterLeafReader.java:201)
```
Still digging into this to figure out why reading is now corrupted.
https://github.com/apache/lucene/pull/12699 has many subtle changes, including
a very big one where we don't copy the byte arrays any longer.
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