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https://issues.apache.org/jira/browse/LUCENE-2554?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12891364#action_12891364
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Robert Muir commented on LUCENE-2554:
-------------------------------------
the perf issues here are really from our contrived tests... its good to use
_TestUtil.randomUnicodeString, but it gives you the impression there is
something wrong with this dance and there really isnt.
I added _TestUtil.randomRealisticUnicodeString in r966878, you can swap this
into some of these slow tests and see its definitely the problem.
> preflex codec doesn't order terms correctly
> -------------------------------------------
>
> Key: LUCENE-2554
> URL: https://issues.apache.org/jira/browse/LUCENE-2554
> Project: Lucene - Java
> Issue Type: Test
> Reporter: Michael McCandless
> Assignee: Michael McCandless
> Fix For: 4.0
>
> Attachments: LUCENE-2554.patch
>
>
> The surrogate dance in the preflex codec (which must dynamically remap terms
> from UTF16 order to unicode code point order) is buggy.
> To better test it, I want to add a test-only codec, preflexrw, that is able
> to write indices in the pre-flex format. Then we should also fix tests to
> randomly pick codecs (including preflexrw) so we better test all of our
> codecs.
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