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https://issues.apache.org/jira/browse/LUCENE-9963?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17373657#comment-17373657
]
ASF subversion and git services commented on LUCENE-9963:
---------------------------------------------------------
Commit 5669f2ba3479fd7dd15105422368f95a45af4ba4 in lucene's branch
refs/heads/branch_8x from Geoffrey Lawson
[ https://gitbox.apache.org/repos/asf?p=lucene.git;h=5669f2b ]
LUCENE-9963 Add tests for alternate path failures in FlattenGraphFilter (#146)
Co-authored-by: Lawson <geof...@amazon.com>
> Flatten graph filter has errors when there are holes at beginning or end of
> alternate paths
> -------------------------------------------------------------------------------------------
>
> Key: LUCENE-9963
> URL: https://issues.apache.org/jira/browse/LUCENE-9963
> Project: Lucene - Core
> Issue Type: Bug
> Components: modules/analysis
> Affects Versions: 8.8
> Reporter: Geoffrey Lawson
> Priority: Major
> Time Spent: 6.5h
> Remaining Estimate: 0h
>
> If asserts are enabled having gaps at the beginning or end of an alternate
> path can result in assertion errors
> ex:
>
> {code:java}
> java.lang.AssertionError: 2
> at
> org.apache.lucene.analysis.core.FlattenGraphFilter.releaseBufferedToken(FlattenGraphFilter.java:195)
> {code}
>
> Or
>
> {code:java}
> java.lang.AssertionError
> at
> org.apache.lucene.analysis.core.FlattenGraphFilter.releaseBufferedToken(FlattenGraphFilter.java:191)
> {code}
>
>
> If asserts are not enabled these the same conditions will result in either
> IndexOutOfBounds Exceptions, or dropped tokens.
>
> {code:java}
> java.lang.ArrayIndexOutOfBoundsException: Index -2 out of bounds for length 8
> at org.apache.lucene.util.RollingBuffer.get(RollingBuffer.java:109)
> at
> org.apache.lucene.analysis.core.FlattenGraphFilter.incrementToken(FlattenGraphFilter.java:325)
> {code}
>
> These issues can be recreated with the following unit tests
> {code:java}
> public void testAltPathFirstStepHole() throws IOException {
> TokenStream in = new CannedTokenStream(0, 3, new Token[]{
> token("abc",1, 3, 0, 3),
> token("b",1, 1, 1, 2),
> token("c",1, 1, 2, 3)
> });
> TokenStream out = new FlattenGraphFilter(in);
> assertTokenStreamContents(out,
> new String[]{"abc", "b", "c"},
> new int[] {0, 1, 2},
> new int[] {3, 2, 3},
> new int[] {1, 1, 1},
> new int[] {3, 1, 1}, //token 0 may need to be len 1 after flattening
> 3);
> }{code}
> {code:java}
> public void testAltPathLastStepHole() throws IOException {
> TokenStream in = new CannedTokenStream(0, 4, new Token[]{
> token("abc",1, 3, 0, 3),
> token("a",0, 1, 0, 1),
> token("b",1, 1, 1, 2),
> token("d",2, 1, 3, 4)
> });
> TokenStream out = new FlattenGraphFilter(in);
> assertTokenStreamContents(out,
> new String[]{"abc", "a", "b", "d"},
> new int[] {0, 0, 1, 3},
> new int[] {1, 1, 2, 4},
> new int[] {1, 0, 1, 2},
> new int[] {3, 1, 1, 1},
> 4);
> }{code}
> {code:java}
> public void testAltPathLastStepHoleWithoutEndToken() throws IOException {
> TokenStream in = new CannedTokenStream(0, 2, new Token[]{
> token("abc",1, 3, 0, 3),
> token("a",0, 1, 0, 1),
> token("b",1, 1, 1, 2)
> });
> TokenStream out = new FlattenGraphFilter(in);
> assertTokenStreamContents(out,
> new String[]{"abc", "a", "b"},
> new int[] {0, 0, 1},
> new int[] {1, 1, 2},
> new int[] {1, 0, 1},
> new int[] {1, 1, 1},
> 2);
> }{code}
> I believe Lucene-8723 is a related issue as it looks like the last token in
> an alternate path is being deleted.
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