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https://issues.apache.org/jira/browse/LUCENE-4599?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13527215#comment-13527215
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Robert Muir commented on LUCENE-4599:
-------------------------------------

I'm not sure how much more compact ords would really be? start thinking about 
average word length, shared prefixes and so on, and long references (even 
though they could be delta-encoded since they are in order, i still imagine 3 
or 4 bytes on average if you assume a large terms dict) don't seem to save a 
lot.

I think its way more important to bulk encode the prefix/suffix lengths.
                
> Compressed term vectors
> -----------------------
>
>                 Key: LUCENE-4599
>                 URL: https://issues.apache.org/jira/browse/LUCENE-4599
>             Project: Lucene - Core
>          Issue Type: Task
>          Components: core/codecs, core/termvectors
>            Reporter: Adrien Grand
>            Assignee: Adrien Grand
>            Priority: Minor
>             Fix For: 4.1
>
>         Attachments: LUCENE-4599.patch
>
>
> We should have codec-compressed term vectors similarly to what we have with 
> stored fields.

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