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https://issues.apache.org/jira/browse/ARROW-1779?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16245775#comment-16245775
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Li Jin edited comment on ARROW-1779 at 11/9/17 2:58 PM:
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[~cpcloud] helped me tracked down the issue in nullCount in vector metadata on 
the Java side. Thanks! I will fix this.


was (Author: icexelloss):
[~cpcloud] helped me tracked down the issue in nullCount in vector metadata. 
Thanks! I will fix this.

> [Java] Integration test breaks without zeroing out validity vectors
> -------------------------------------------------------------------
>
>                 Key: ARROW-1779
>                 URL: https://issues.apache.org/jira/browse/ARROW-1779
>             Project: Apache Arrow
>          Issue Type: Sub-task
>            Reporter: Li Jin
>             Fix For: 0.8.0
>
>         Attachments: nested.bad, nested.good, nested.json
>
>
> This is discovered in https://github.com/apache/arrow/pull/1290
> I found one the integration test (nested) failed without zeroing out validity 
> vectors before loading the array from json.
> I have created three files to reproduce this:
> (1) nested.json 
> (2) nested.good (zeroing out validity vector before reading)
> (3) nested.bad (not zeroing out validity vector before reading)
> (1) / (2) and (1) / (3) both pass Java integration test, however (1) / (3) 
> fails C++ test - one of the validity vector in (3) doesn't seem to be read 
> correctly.
> I am not sure what the issue is because I cannot reproduce an error in Java. 
> I am hoping maybe some one more familiar with C++ could take a look and give 
> some insights what's the wrong with (3). 



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