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From "Grant Ingersoll (JIRA)" <j...@apache.org>
Subject [jira] Commented: (SOLR-1566) Allow components to add fields to outgoing documents
Date Thu, 12 Aug 2010 12:26:16 GMT

    [ https://issues.apache.org/jira/browse/SOLR-1566?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12897721#action_12897721
] 

Grant Ingersoll commented on SOLR-1566:
---------------------------------------

bq. If we think in terms of spatial distances, then it might be useful to be able to sort
by the pseudo field? I know we currently resolve that issue by sorting by function query,
but if you already calculate the distance in some other spatial process, might as well be
able to sort on it? 

Yeah, that is true, but sorting is such a low level operation and this issue is about any
component doing it, no matter where in the list it occurs.  I just don't see how to make the
two sync up w/o having to resort and that would be a perf. killer in many ways (CPU and memory).
  IMO, I think this piece of functionality should be about "marking up" the result set that
is going to be returned.  

Of course, even with the approach I propose, it has the potential to be a memory killer if
done wrong.  For instance, I doubt you'd want to stuff in the Map every single distance you
calculate, you really only want to add those items that you know are going to be in the final
result list.  Perhaps the alternate way is to provide a call back mechanism at Document binding
time (i.e. the ResponseWriter) where it gives some Interface the document and then the implementation
can add what it wants per the application.

> Allow components to add fields to outgoing documents
> ----------------------------------------------------
>
>                 Key: SOLR-1566
>                 URL: https://issues.apache.org/jira/browse/SOLR-1566
>             Project: Solr
>          Issue Type: New Feature
>          Components: search
>            Reporter: Noble Paul
>            Assignee: Grant Ingersoll
>             Fix For: Next
>
>         Attachments: SOLR-1566.patch, SOLR-1566.patch, SOLR-1566.patch, SOLR-1566.patch
>
>
> Currently it is not possible for components to add fields to outgoing documents which
are not in the the stored fields of the document.  This makes it cumbersome to add computed
fields/metadata .

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