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From "Cao Manh Dat (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (SOLR-8344) Decide default when requested fields are both column and row stored.
Date Thu, 07 Sep 2017 23:39:00 GMT

    [ https://issues.apache.org/jira/browse/SOLR-8344?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16157864#comment-16157864
] 

Cao Manh Dat commented on SOLR-8344:
------------------------------------

[~dsmiley] 
bq.I don't think the number of documents is that pertinent since both strategies are O(docs)
multiplied by other factors. 
No, It matter in case of "fl" contains a field which is stored only (let's call it field1).
Because we already have to pay for seek cost for reading field1 therefore reading both field2
and field3 from stored will be faster than reading field2 and field3 from DV. I tested this
result with Lucene (not Solr) so we don't have to worry about caching will affect the result
here.

> Decide default when requested fields are both column and row stored.
> --------------------------------------------------------------------
>
>                 Key: SOLR-8344
>                 URL: https://issues.apache.org/jira/browse/SOLR-8344
>             Project: Solr
>          Issue Type: New Feature
>            Reporter: Ishan Chattopadhyaya
>         Attachments: SOLR-8344.patch
>
>
> This issue was discussed in the comments at SOLR-8220. Splitting it out to a separate
issue so that we can have a focused discussion on whether/how to do this.
> If a given set of requested fields are all stored and have docValues (column stored),
we can retrieve the values from either place.  What should the default be?



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