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https://issues.apache.org/jira/browse/SOLR-12572?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16554736#comment-16554736
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Amrit Sarkar edited comment on SOLR-12572 at 7/24/18 8:06 PM:
--------------------------------------------------------------

Thanks Varun; great insights. I am able to put up a patch, with respect to your 
comments, which optimise for all field types at export writing, except 
{{MultiFieldWriter}} for now.


was (Author: sarkaramr...@gmail.com):
Thanks Varun; great insights. I am able to put up a patch which optimise for 
all field types at export writing, except {{MultiFieldWriter}} for now.

> Reuse fieldvalues computed while sorting at writing in ExportWriter
> -------------------------------------------------------------------
>
>                 Key: SOLR-12572
>                 URL: https://issues.apache.org/jira/browse/SOLR-12572
>             Project: Solr
>          Issue Type: Improvement
>      Security Level: Public(Default Security Level. Issues are Public) 
>          Components: streaming expressions
>            Reporter: Amrit Sarkar
>            Assignee: Varun Thacker
>            Priority: Minor
>         Attachments: S-12572.patch, SOLR-12572.patch, SOLR-12572.patch
>
>
> While exporting result through "/export" handler,
> {code:java}
> http://localhost:8983/solr/core_name/export?q=my-query&sort=severity+desc,timestamp+desc&fl=severity,timestamp,msg
> {code}
> Doc-values are sought for all the {{sort}} fields defined (in this example 
> 'severity, 'timestamp'). When we stream out docs we again make doc-value 
> seeks against the {{fl}} fields ('severity','timestamp','msg') . 
> In most common use-cases we have {{fl = sort}} fields, or atleast the sort 
> fields are subset of {{fl}} fields, so if we can *pre-collect* the values 
> while sorting it, we can reduce the doc-value seeks potentially bringing 
> *speed improvement*.



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