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https://issues.apache.org/jira/browse/SOLR-1297?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12916746#action_12916746
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Hoss Man commented on SOLR-1297:
--------------------------------
In dependent of my previous patch, there is one other nuance i discoverd today
that i wanted to bring up...
The way localparams are currently supported in the sort param, they are
independent for each "segment" of the sort. The easiest way to make sense of
this is to look at the following contrived example URL (you can try it against
the example data on trunk) ...
{noformat}
?q=*:*&fl=price,id&foo=0&sort={!foo=2}sum($foo,0)+asc,+mul($foo,price)+desc,+id+asc
{noformat}
...that URL (currently) results in a sort which is equivalent to "id asc" ..
the localParam value of "foo=2" at the begining of the sort param is only in
scope for the first segment...
{noformat}
{!foo=2}sum($foo,0) asc
{noformat}
..the second segment of the sort param winds up getting the "global" value of
"foo=0" ...
{noformat}
mul($foo,price) desc
{noformat}
...so it becomes a NOOP (multiplication by zero)
This limited scoping of localParams in the sort param seems counter intuitive
to me. I don't know that i have a better suggestion for how it *should* work,
but i wanted to draw attention to it in case other folks had any ideas
> Enable sorting by Function Query
> --------------------------------
>
> Key: SOLR-1297
> URL: https://issues.apache.org/jira/browse/SOLR-1297
> Project: Solr
> Issue Type: New Feature
> Reporter: Grant Ingersoll
> Assignee: Grant Ingersoll
> Priority: Minor
> Fix For: 1.5, 3.1, 4.0
>
> Attachments: SOLR-1297-2.patch, SOLR-1297.better.field.support.patch,
> SOLR-1297.patch, SOLR-1297.patch, SOLR-1297.patch
>
>
> It would be nice if one could sort by FunctionQuery. See also SOLR-773,
> where this was first mentioned by Yonik as part of the generic solution to
> geo-search
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