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https://issues.apache.org/jira/browse/LUCENE-8033?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16272817#comment-16272817
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Michael Braun commented on LUCENE-8033:
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Sorry [~jpountz] - delete by query. Don't have the snapshot of the sampling
handy, but it was spending a large amount of time constructing the FieldInfos,
all spent in the adding to byNumber within the constructor - which is dropped
in the case of the dense case, though it is used so the FieldInfos are sorted
in the dense case too - one would need to do sort on another structure at
minimum the way it looks right now, not 100% this would even be faster but
hopefully!
[~dsmiley] exactly, this was a significant amount of time.
> Should FieldInfos always use a dense encoding?
> ----------------------------------------------
>
> Key: LUCENE-8033
> URL: https://issues.apache.org/jira/browse/LUCENE-8033
> Project: Lucene - Core
> Issue Type: Wish
> Reporter: Adrien Grand
> Priority: Trivial
> Labels: newdev
>
> Spin-off from LUCENE-8018. The dense vs. sparse encoding logic of FieldInfos
> introduces complexity. Given that the sparse encoding is only used when less
> than 1/16th of fields are used, which sounds uncommon to me, maybe we should
> use a dense encoding all the time?
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