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From "David Smiley (JIRA)" <>
Subject [jira] [Commented] (SOLR-11916) new SortableTextField using docValues built from the original string input
Date Fri, 26 Jan 2018 22:43:01 GMT


David Smiley commented on SOLR-11916:


{{maxChars}} raises some concerns that need to be documented and cared for in the code.  We'd
have a field with docValues, but it's value isn't necessarily a substitute for the "stored"
version.  We have code in places right now that will need to know about this exception to
useDocValueAsStored.  Perhaps this fieldType overrides useDocValuesAsStored() to see if maxChars=-1
(no limit) so it can vary it's output based on that?

> new SortableTextField using docValues built from the original string input
> --------------------------------------------------------------------------
>                 Key: SOLR-11916
>                 URL:
>             Project: Solr
>          Issue Type: Improvement
>      Security Level: Public(Default Security Level. Issues are Public) 
>            Reporter: Hoss Man
>            Assignee: Hoss Man
>            Priority: Major
>         Attachments: SOLR-11916.patch
> I propose adding a new SortableTextField subclass that would functionally work the same
as TextField except:
> * {{docValues="true|false"}} could be configured, with the default being "true"
> * The docValues would contain the original input values (just like StrField) for sorting
(or faceting)
> ** By default, to protect users from excessively large docValues, only the first 1024
of each field value would be used -- but this could be overridden with configuration.
> ----
> Consider the following sample configuration:
> {code}
> <field name="title" type="text_sortable" docValues="true"
>        indexed="true" docValues="true" stored="true" multiValued="false"/>
> <fieldType name="text_sortable" class="solr.SortableTextField">
>   <analyzer type="index">
>    ...
>   </analyzer>
>   <analyzer type="query">
>    ...
>   </analyzer>
> </fieldType>
> {code}
> Given a document with a title of "Solr In Action"
> Users could:
> * Search for individual (indexed) terms in the "title" field: {{q=title:solr}}
> * Sort documents by title ( {{sort=title asc}} ) such that this document's sort value
would be "Solr In Action"
> If another document had a "title" value that was longer then 1024 chars, then the docValues
would be built using only the first 1024 characters of the value (unless the user modified
the configuration) 
> This would be functionally equivalent to the following existing configuration - including
the on disk index segments - except that the on disk DocValues would refer directly to the
"title" field, reducing the total number of "field infos" in the index (which has a small
impact on segment housekeeping and merge times) and end users would not need to sort on an
alternate "title_string" field name - the original "title" field name would always be used
> {code}
> <field name="title" type="text"
>        indexed="true" docValues="true" stored="true" multiValued="false"/>
> <field name="title_string" type="string"
>        indexed="false" docValues="true" stored="false" multiValued="false"/>
> <copyField source="title" dest="title_string" maxChars="1024" />
> {code}

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