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https://issues.apache.org/jira/browse/LUCENE-6914?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15035905#comment-15035905
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Robert Muir commented on LUCENE-6914:
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looks buggy indeed. Can we also add a simple test (𝟙x𝟡x𝟠x𝟜 -> 1x9x8x4) ?
> DecimalDigitFilter skips characters in some cases (supplemental?)
> -----------------------------------------------------------------
>
> Key: LUCENE-6914
> URL: https://issues.apache.org/jira/browse/LUCENE-6914
> Project: Lucene - Core
> Issue Type: Bug
> Affects Versions: 5.4
> Reporter: Hoss Man
> Attachments: LUCENE-6914.patch, LUCENE-6914.patch, LUCENE-6914.patch
>
>
> Found this while writing up the solr ref guide for DecimalDigitFilter.
> With input like "𝟙𝟡𝟠𝟜" ("Double Struck" 1984) the filter produces "1𝟡8𝟜" (1,
> double struck 9, 8, double struck 4) add some non-decimal characters in
> between the digits (ie: "𝟙x𝟡x𝟠x𝟜") and you get the expected output
> ("1x9x8x4"). This doesn't affect all decimal characters though, as evident
> by the existing test cases.
> Perhaps this is an off by one bug in the "if the original was supplementary,
> shrink the string" code path?
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