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Posted to issues@arrow.apache.org by "Ji Liu (Jira)" <ji...@apache.org> on 2019/10/11 10:33:00 UTC
[jira] [Updated] (ARROW-6853) [Java] Support vector and dictionary
encoder use different hasher for calculating hashCode
[ https://issues.apache.org/jira/browse/ARROW-6853?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Ji Liu updated ARROW-6853:
--------------------------
Description:
Hasher interface was introduce in ARROW-5898 and now have two different implementations ({{MurmurHasher and SimpleHasher}}) and it could be more in the future.
And currently {{ValueVector#hashCode}} and {{DictionaryHashTable}} only use {{SimpleHasher}} for calculating hashCode. This issue enables them to use different hasher or even user-defined hasher for their own use cases.
was:
Hasher interface was introduce in ARROW-5898 and now have two different implementations ({{MurmurHasher and }}{{SimpleHasher}}) and it could be more in the future.
And currently {{ValueVector#hashCode}} and {{DictionaryHashTable}} only use {{SimpleHasher}} for calculating hashCode. This issue enables them to use different hasher or even user-defined hasher for their own use cases.
> [Java] Support vector and dictionary encoder use different hasher for calculating hashCode
> ------------------------------------------------------------------------------------------
>
> Key: ARROW-6853
> URL: https://issues.apache.org/jira/browse/ARROW-6853
> Project: Apache Arrow
> Issue Type: New Feature
> Components: Java
> Reporter: Ji Liu
> Assignee: Ji Liu
> Priority: Major
>
> Hasher interface was introduce in ARROW-5898 and now have two different implementations ({{MurmurHasher and SimpleHasher}}) and it could be more in the future.
> And currently {{ValueVector#hashCode}} and {{DictionaryHashTable}} only use {{SimpleHasher}} for calculating hashCode. This issue enables them to use different hasher or even user-defined hasher for their own use cases.
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