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Posted to issues@lucene.apache.org by "Robert Muir (Jira)" <ji...@apache.org> on 2021/02/21 17:53:00 UTC
[jira] [Updated] (LUCENE-9796) fix SortedDocValues to no longer
extend BinaryDocValues
[ https://issues.apache.org/jira/browse/LUCENE-9796?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Robert Muir updated LUCENE-9796:
--------------------------------
Attachment: LUCENE-9796_prototype.patch
> fix SortedDocValues to no longer extend BinaryDocValues
> -------------------------------------------------------
>
> Key: LUCENE-9796
> URL: https://issues.apache.org/jira/browse/LUCENE-9796
> Project: Lucene - Core
> Issue Type: Improvement
> Reporter: Robert Muir
> Priority: Major
> Attachments: LUCENE-9796_prototype.patch
>
>
> SortedDocValues give ordinals and a way to derefence ordinal as a byte[]
> But currently they *extend* BinaryDocValues, which allows directly calling {{binaryValue()}}.
> This allows them to act as a "slow" BinaryDocValues, but it is a performance trap, especially now that terms bytes may be block-compressed (LUCENE-9663).
> I think this should be detangled to prevent performance traps like LUCENE-9795: SortedDocValues shouldn't have the trappy inherited {{binaryValue()}} method that implicitly derefs the ord for the doc, then the term bytes for the ord.
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