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https://issues.apache.org/jira/browse/SOLR-10918?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Houston Putman updated SOLR-10918:
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Fix Version/s: main (10.0)
9.2
Resolution: Fixed
Status: Resolved (was: Patch Available)
> Hashing for IntPointFields is broken for HLL
> --------------------------------------------
>
> Key: SOLR-10918
> URL: https://issues.apache.org/jira/browse/SOLR-10918
> Project: Solr
> Issue Type: Bug
> Reporter: Chris M. Hostetter
> Assignee: Houston Putman
> Priority: Major
> Labels: numeric-tries-to-points
> Fix For: main (10.0), 9.2
>
> Time Spent: 20m
> Remaining Estimate: 0h
>
> discovered as part of SOLR-10807...
> when using Points based numerics, the HLL estimates using the raw values vs
> the hashed values disagree slightly -- this suggests some possible bug (or
> the very least: room for optimization) when using Points fields.
> Example from SOLR-10807 when swaping IntPointField in place of TrieIntField...
> {code}
> [junit4] 2> NOTE: reproduce with: ant test
> -Dtestcase=TestDistributedStatsComponentCardinality -Dtests.method=test
> -Dtests.seed=63854996088ED7B7 -Dtests.slow=true -Dtests.locale=de-GR
> -Dtests.timezone=Etc/UCT -Dtests.asserts=true -Dtests.file.encoding=ISO-8859-1
> [junit4] FAILURE 13.3s J2 | TestDistributedStatsComponentCardinality.test
> <<<
> [junit4] > Throwable #1: java.lang.AssertionError: int_i: hashed vs
> prehashed, real=7260,
> p=q=id:[1186+TO+8445]&rows=0&stats=true&stats.field={!cardinality%3Dtrue+hllLog2m%3D7+hllRegwidth%3D8}int_i&stats.field={!cardinality%3Dtrue+hllLog2m%3D7+hllRegwidth%3D8+hllPreHashed%3Dtrue}int_i_prehashed_l&stats.field={!cardinality%3Dtrue+hllLog2m%3D7+hllRegwidth%3D8}long_l&stats.field={!cardinality%3Dtrue+hllLog2m%3D7+hllRegwidth%3D8+hllPreHashed%3Dtrue}long_l_prehashed_l&stats.field={!cardinality%3Dtrue+hllLog2m%3D7+hllRegwidth%3D8}string_s&stats.field={!cardinality%3Dtrue+hllLog2m%3D7+hllRegwidth%3D8+hllPreHashed%3Dtrue}string_s_prehashed_l
> expected:<6632> but was:<7929>
> [junit4] > at
> __randomizedtesting.SeedInfo.seed([63854996088ED7B7:EBD1764CA672BA4F]:0)
> [junit4] > at
> org.apache.solr.handler.component.TestDistributedStatsComponentCardinality.test(TestDistributedStatsComponentCardinality.java:149)
> {code}
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