[jira] [Updated] (LUCENE-7958) Give TermInSetQuery better advancing capabilities

["Adrien Grand (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/LUCENE-7958?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Adrien Grand updated LUCENE-7958:
---------------------------------
    Attachment: LUCENE-7958.patch

Here is a patch.

> Give TermInSetQuery better advancing capabilities
> -------------------------------------------------
>
>                 Key: LUCENE-7958
>                 URL: https://issues.apache.org/jira/browse/LUCENE-7958
>             Project: Lucene - Core
>          Issue Type: Improvement
>            Reporter: Adrien Grand
>            Priority: Minor
>         Attachments: LUCENE-7958.patch
>
>
> If a TermInSetQuery has more than 15 matching terms on a given segment, then we consume all postings lists into a bitset and return an iterator over this bitset as a scorer. I would like to change it so that we keep the 15 postings lists that have the largest document frequencies and consume all other (shorter) postings lists into a bitset. In the end we return a disjunction over the N longest postings lists and the bit set. This could help consume fewer doc ids if the TermInSetQuery is intersected with other queries, especially if the document frequencies of the terms it wraps have a zipfian distribution.



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