Shawn Heisey created LUCENE-6689:
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Summary: Odd analysis problem with WDF, appears to be triggered by
preceding analysis components
Key: LUCENE-6689
URL: https://issues.apache.org/jira/browse/LUCENE-6689
Project: Lucene - Core
Issue Type: Bug
Affects Versions: 4.8
Reporter: Shawn Heisey
This problem shows up for me in Solr, but I believe the issue is down at the
Lucene level, so I've opened the issue in the LUCENE project. We can move it
if necessary.
I've boiled the problem down to this minimum Solr fieldType:
{noformat}
<fieldType name="testType" class="solr.TextField"
sortMissingLast="true" positionIncrementGap="100">
<analyzer>
<tokenizer
class="org.apache.lucene.analysis.icu.segmentation.ICUTokenizerFactory"
rulefiles="Latn:Latin-break-only-on-whitespace.rbbi"/>
<filter class="solr.PatternReplaceFilterFactory"
pattern="^(\p{Punct}*)(.*?)(\p{Punct}*)$"
replacement="$2"
/>
<filter class="solr.WordDelimiterFilterFactory"
splitOnCaseChange="1"
splitOnNumerics="1"
stemEnglishPossessive="1"
generateWordParts="1"
generateNumberParts="1"
catenateWords="1"
catenateNumbers="1"
catenateAll="0"
preserveOriginal="1"
/>
</analyzer>
</fieldType>
{noformat}
On Solr 4.7, if this type is given the input "aaa-bbb: ccc" then aaa ends up at
term position 1 and bbb at term position 2. This seems perfectly reasonable to
me. In Solr 4.9, both terms end up at position 2. This causes phrase queries
which used to work to return zero hits. The exact text of the phrase query is
in the original documents that match on 4.7.
If the custom rbbi (which is included unmodified from the lucene icu analysis
source code) is not used, then the problem doesn't happen, because the
punctuation doesn't make it to the PRF. If the PatternReplaceFilterFactory is
not present, then the problem doesn't happen.
I can work around the problem by setting luceneMatchVersion to 4.7, but I think
the behavior is a bug, and I would rather not continue to use 4.7 analysis when
I upgrade to 5.x, which I hope to do soon.
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