Chris M. Hostetter created LUCENE-10007:
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Summary: CommonGramsQueryFilter: javadoc example does not produce
output indicated
Key: LUCENE-10007
URL: https://issues.apache.org/jira/browse/LUCENE-10007
Project: Lucene - Core
Issue Type: Bug
Reporter: Chris M. Hostetter
CommonGramsQueryFilter has the following explanation of it's behavior + example
twice in it's javadocs (both at the class level and the incrementToken method
level)..
{noformat}
/**
* Wrap a CommonGramsFilter optimizing phrase queries by only returning single
words when they are
* not a member of a bigram.
*
* <p>Example:
*
* <ul>
* <li>query input to CommonGramsFilter: "the rain in spain falls mainly"
* <li>output of CommomGramsFilter/input to CommonGramsQueryFilter: |"the,
"the-rain"|"rain"
* "rain-in"|"in, "in-spain"|"spain"|"falls"|"mainly"
* <li>output of CommonGramsQueryFilter:"the-rain", "rain-in" ,"in-spain",
"falls", "mainly"
* </ul>
*/
{noformat}
But this input doesn't actually produce the documented output:
CommonGramsQueryFilter does in fact produce a token for "spain" even though it
is part of the "in-spain" bigram.
I'm not really sure which is "wrong" – the implementation or the documentation
– but something seems to be out of whack.
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_(a more trivial discrepancy is the use of "_" [underscore] in the
CommomGramsFilter vs "-" [dash] in the javadoc example)_
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