[jira] (SOLR-18251) Add Solr schema support for DocValues skip lists

["Vadim Kirilchuk (Jira)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/SOLR-18251 ]


    Vadim Kirilchuk deleted comment on SOLR-18251:
    ----------------------------------------

was (Author: vkirilchuk):
Parent lucene issue

> Add Solr schema support for DocValues skip lists
> ------------------------------------------------
>
>                 Key: SOLR-18251
>                 URL: https://issues.apache.org/jira/browse/SOLR-18251
>             Project: Solr
>          Issue Type: Task
>          Components: Schema and Analysis
>    Affects Versions: 10.1
>            Reporter: Sanjay Dutt
>            Priority: Major
>              Labels: pull-request-available
>          Time Spent: 50m
>  Remaining Estimate: 0h
>
> Lucene introduced optional skip lists on top of DocValues in apache/lucene#13449. The feature is exposed through the {{DocValuesSkipper}} abstraction and is controlled by a Lucene {{FieldType}} flag.
> Solr currently exposes DocValues through schema configuration, but does not provide a schema-level option to enable this DocValues skip list support.
> This issue proposes adding an opt-in Solr schema option, such as:
> {code:java}
> docValuesSkipList="true"{code}
> Example:
> {code:java}
> <field name="price"
>        type="plong"
>        indexed="false"
>        docValues="true"
>        docValuesSkipList="true" />{code}
> The Lucene PR notes that this can be efficient when the index is sorted and the field belongs to the index sorting. 
> The actual benefit depends on data layout and query pattern, so this should be exposed as an opt-in feature.
> Only compatible DocValues field types should allow this option. Based on the Lucene PR, this applies to DocValues types such as {{{}NUMERIC{}}}, {{{}SORTED_NUMERIC{}}}, {{{}SORTED{}}}, and {{{}SORTED_SET{}}}. 



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