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https://issues.apache.org/jira/browse/LUCENE-9053?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17006894#comment-17006894
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Michael McCandless commented on LUCENE-9053:
--------------------------------------------
+1 to improve {{package-info.java}} in
{{lucene/core/src/java/org/apache/lucene/util}}!
Maybe we should just say Unicode code point order, not UTF16 as Java's
{{String.compareTo}} sorts?
> java.lang.AssertionError: inputs are added out of order lastInput=[f0 9d 9c
> 8b] vs input=[ef ac 81 67 75 72 65]
> ---------------------------------------------------------------------------------------------------------------
>
> Key: LUCENE-9053
> URL: https://issues.apache.org/jira/browse/LUCENE-9053
> Project: Lucene - Core
> Issue Type: Bug
> Reporter: gitesh
> Priority: Minor
>
> Even if the inputs are sorted in unicode order, I get following exception
> while creating FST:
>
> {code:java}
> // Input values (keys). These must be provided to Builder in Unicode sorted
> order!
> String inputValues[] = {"𝐴", "figure", "flagship"};
> long outputValues[] = {5, 7, 12};
> PositiveIntOutputs outputs = PositiveIntOutputs.getSingleton();
> Builder<Long> builder = new Builder<Long>(FST.INPUT_TYPE.BYTE1, outputs);
> BytesRefBuilder scratchBytes = new BytesRefBuilder();
> IntsRefBuilder scratchInts = new IntsRefBuilder();
> for (int i = 0; i < inputValues.length; i++) {
> scratchBytes.copyChars(inputValues[i]);
> builder.add(Util.toIntsRef(scratchBytes.get(), scratchInts),
> outputValues[i]);
> }
> FST<Long> fst = builder.finish();
> Long value = Util.get(fst, new BytesRef("figure"));
> System.out.println(value);
> {code}
> Please note that figure {color:#172b4d}and{color} flagship {color:#172b4d}are
> using the ligature character{color} fl {color:#172b4d}above. {color}
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