[jira] [Created] (LUCENE-4799) Enable extraction of originating term for ICU collation keys

["Toke Eskildsen (JIRA)" <ji...@apache.org>]

Toke Eskildsen created LUCENE-4799:
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             Summary: Enable extraction of originating term for ICU collation keys
                 Key: LUCENE-4799
                 URL: https://issues.apache.org/jira/browse/LUCENE-4799
             Project: Lucene - Core
          Issue Type: Improvement
          Components: core/other
    Affects Versions: 4.1
            Reporter: Toke Eskildsen
            Priority: Minor


By concatenating generated ICU collation keys bytes with the originating term, it is possible to extract the originating term at a later time. This makes it possible to build a collator sorted facet field and similar multi-value/document structures.

ICU collation keys are guaranteed to be terminated by a 0 (https://ssl.icu-project.org/apiref/icu4j48rc1/com/ibm/icu/text/CollationKey.html) and since comparison of keys stop when a 0 is encountered, the addition of the originating term does not affect sort order. As 0 are _only_ used for termination in the key bytes, the extraction of the originating term is unambiguous.

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