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


Dong Chen commented on HIVE-10257:

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

> Ensure Parquet Hive has null optimization
> -----------------------------------------
>                 Key: HIVE-10257
>                 URL:
>             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

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