[jira] [Updated] (ARROW-9680) [Java] Support non-nullable vectors

["ASF GitHub Bot (Jira)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/ARROW-9680?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

ASF GitHub Bot updated ARROW-9680:
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    Labels: pull-request-available  (was: )

> [Java] Support non-nullable vectors
> -----------------------------------
>
>                 Key: ARROW-9680
>                 URL: https://issues.apache.org/jira/browse/ARROW-9680
>             Project: Apache Arrow
>          Issue Type: New Feature
>          Components: Java
>            Reporter: Liya Fan
>            Assignee: Liya Fan
>            Priority: Major
>              Labels: pull-request-available
>          Time Spent: 10m
>  Remaining Estimate: 0h
>
> This issue was first discussed in the ML ([https://lists.apache.org/thread.html/r480387ec9ec822f3ed30e9131109e43874a1c4d18af74ede1a7e41c5%40%3Cdev.arrow.apache.org%3E]), from which we have received some feedback.
> We briefly resate it here as below:
>  
> 1. Non-nullable vectors are widely used in practice. For example, in a database engine, a column can be declared as not null, so it cannot contain null values.
> 2.Non-nullable vectors has significant performance advantages compared with their nullable conterparts, such as:
>   1) the memory space of the validity buffer can be saved.
>   2) manipulation of the validity buffer can be bypassed
>   3) some if-else branches can be replaced by sequential instructions (by the JIT compiler), leading to high throughput for the CPU pipeline. 
>  
> We open this Jira to facilitate further discussions, and we may provide a sample PR, which will help us make a clearer decision. 



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