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https://issues.apache.org/jira/browse/LUCENE-4715?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13565415#comment-13565415
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Michael McCandless commented on LUCENE-4715:
--------------------------------------------
Here's the per-dim-rollup results. The index has 2 CLPs: one with only Date,
the other with username+categories (= many ords, flat), and I facet only on
Date CLP.
base = trunk, comp = per-dim rollup
{noformat}
Task QPS base StdDev QPS comp StdDev
Pct diff
HighTerm 21.08 (6.9%) 21.26 (5.2%) 0.9%
( -10% - 13%)
MedTerm 50.06 (6.1%) 52.39 (4.4%) 4.6%
( -5% - 16%)
LowTerm 97.70 (4.7%) 110.47 (4.6%) 13.1%
( 3% - 23%)
{noformat}
So it helps most for queries matching fewer docs since the rollup is a fixed
cost in the end ...
> Add OrdinalPolicy.NO_DIMENSION
> ------------------------------
>
> Key: LUCENE-4715
> URL: https://issues.apache.org/jira/browse/LUCENE-4715
> Project: Lucene - Core
> Issue Type: Improvement
> Components: modules/facet
> Reporter: Shai Erera
> Assignee: Shai Erera
> Attachments: LUCENE-4715.patch
>
>
> With the move of OrdinalPolicy to CategoryListParams,
> NonTopLevelOrdinalPolicy was nuked. It might be good to restore it, as
> another enum value of OrdinalPolicy.
> It's the same like ALL_PARENTS, only doesn't add the dimension ordinal, which
> could save space as well as computation time. It's good for when you don't
> care about the count of Date/, but only about its children counts.
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