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From "Yonik Seeley (JIRA)" <j...@apache.org>
Subject [jira] Commented: (SOLR-1478) Enable sort by docid
Date Fri, 02 Oct 2009 21:13:23 GMT

    [ https://issues.apache.org/jira/browse/SOLR-1478?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12761725#action_12761725
] 

Yonik Seeley commented on SOLR-1478:
------------------------------------

A Lucene field name can be anything... so '#' could also be a collision.
If we wish to reserve certain names going forward, I'd vote for reserving ids with an underscore
on either side.

But really, the whole collision thing is overblown... this is a single name that people will
not have used before. On a practical level, I don't believe it's an issue.
We will need another one too - as a container for document metadata.  I've suggested _meta_
for that in SOLR-705.

We aren't adding these all the time... there was exactly one before this.. "score".  No future
document level metadata will collide since they will be contained in whatever _meta_ ends
up being.

Further advantages to __id__  (single underscores surrounding the id):
 - consistent with magic fieldnames __query__ and __val__ for nested queries in the query
parser, and I could see supporting __id__:1 in the future
 - people *may* want to return the actual ids for documents... wherever that info goes (separate
return vector like sort_field_values for distributed search or __meta__) it will be nicer
for clients if the label for it is actually an identifier and not '#'

> Enable sort by docid
> --------------------
>
>                 Key: SOLR-1478
>                 URL: https://issues.apache.org/jira/browse/SOLR-1478
>             Project: Solr
>          Issue Type: New Feature
>          Components: search
>            Reporter: Erik Hatcher
>            Priority: Minor
>             Fix For: 1.4
>
>         Attachments: SOLR-1478.patch
>
>
> Lucene allows sorting by docid, but Solr currently does not provide a way to specify
it. 

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