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From "Dong Chen (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HIVE-10257) Ensure Parquet Hive has null optimization
Date Mon, 11 May 2015 07:51:31 GMT

    [ https://issues.apache.org/jira/browse/HIVE-10257?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14537693#comment-14537693
] 

Dong Chen commented on HIVE-10257:
----------------------------------

Upload a patch to check the column statics and filter functionality when a column has null
values.

> Ensure Parquet Hive has null optimization
> -----------------------------------------
>
>                 Key: HIVE-10257
>                 URL: https://issues.apache.org/jira/browse/HIVE-10257
>             Project: Hive
>          Issue Type: Sub-task
>            Reporter: Dong Chen
>            Assignee: Dong Chen
>         Attachments: HIVE-10257-parquet.1.patch, HIVE-10257-parquet.patch
>
>
> In Parquet statistics, a boolean value {{hasNonNullValue}} is used for each column chunk.
Hive could use this value to skip a column, avoid null-checking logic, and speed up vectorization
like HIVE-4478 (in the future, Parquet vectorization is not completed yet).
> In this Jira we could check whether this null optimization works, and make changes if
any.



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