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Posted to issues@spark.apache.org by "Apache Spark (Jira)" <ji...@apache.org> on 2020/09/23 10:32:00 UTC

[jira] [Assigned] (SPARK-32974) FeatureHasher transform optimization

     [ https://issues.apache.org/jira/browse/SPARK-32974?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Apache Spark reassigned SPARK-32974:
------------------------------------

    Assignee:     (was: Apache Spark)

> FeatureHasher transform optimization
> ------------------------------------
>
>                 Key: SPARK-32974
>                 URL: https://issues.apache.org/jira/browse/SPARK-32974
>             Project: Spark
>          Issue Type: Improvement
>          Components: ML
>    Affects Versions: 3.1.0
>            Reporter: zhengruifeng
>            Priority: Minor
>
> for a numerical column, its output index is a hash of its col_name, we can pre-compute it at first, instead of computing it on each row.



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