Sanjay Dutt created SOLR-18251:
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Summary: 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
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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