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From "Earwin Burrfoot (JIRA)" <j...@apache.org>
Subject [jira] Commented: (LUCENE-2265) improve automaton performance by running on byte[]
Date Fri, 02 Apr 2010 23:53:27 GMT

    [ https://issues.apache.org/jira/browse/LUCENE-2265?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12853010#action_12853010
] 

Earwin Burrfoot commented on LUCENE-2265:
-----------------------------------------

Hmmmmm.

I'd say that your highlevel operations like intersection and union remain exactly the same
regardless of the alphabet you're operating on.
The primitive automata, like AnyChar will have to cease being so primitive and generate a
pair of states instead of one, but that's essentially it - after primitive automatas are fixed
to recognize utf-8 bytes, you don't even have to change parsing code that much.

The only true problem I see is that you lose the ability to operate on char[]. But then, I
ask that again, do you write a generic library, or you borrowed automata code from one with
a single aim of having fast lucene queries?

> improve automaton performance by running on byte[]
> --------------------------------------------------
>
>                 Key: LUCENE-2265
>                 URL: https://issues.apache.org/jira/browse/LUCENE-2265
>             Project: Lucene - Java
>          Issue Type: Improvement
>          Components: Search
>    Affects Versions: Flex Branch
>            Reporter: Robert Muir
>            Priority: Minor
>             Fix For: Flex Branch
>
>         Attachments: LUCENE-2265.patch
>
>
> Currently, when enumerating terms, automaton must convert entire terms from flex's native
utf-8 byte[] to char[] first, then step each char thru the state machine.
> we can make this more efficient, by allowing the state machine to run on byte[], so it
can return true/false faster.

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