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From "Adrien Grand (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (LUCENE-6819) Deprecate index-time boosts?
Date Wed, 15 Feb 2017 14:51:41 GMT

    [ https://issues.apache.org/jira/browse/LUCENE-6819?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15867951#comment-15867951
] 

Adrien Grand commented on LUCENE-6819:
--------------------------------------

An interesting side-effect of such a change is that we could make the length normalization
factors more accurate. If we remove index-time boosts, then length normalization factors would
always be less than or equal to 1 so we could take one bit from the exponent and use it for
the mantissa instead.

> Deprecate index-time boosts?
> ----------------------------
>
>                 Key: LUCENE-6819
>                 URL: https://issues.apache.org/jira/browse/LUCENE-6819
>             Project: Lucene - Core
>          Issue Type: Task
>            Reporter: Adrien Grand
>            Priority: Minor
>
> Follow-up of this comment: https://issues.apache.org/jira/browse/LUCENE-6818?focusedCommentId=14934801&page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#comment-14934801
> Index-time boosts are a very expert feature whose behaviour is tight to the Similarity
impl. Additionally users have often be confused by the poor precision due to the fact that
we encode values on a single byte. But now we have doc values that allow you to encode any
values the way you want with as much precision as you need so maybe we should deprecate index-time
boosts and recommend to encode index-time scoring factors into doc values fields instead.



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