[jira] [Updated] (ARROW-3693) [R] Invalid buffer for empty characters with null data

["Javier Luraschi (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/ARROW-3693?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Javier Luraschi updated ARROW-3693:
-----------------------------------
    Summary: [R] Invalid buffer for empty characters with null data  (was: [R] Invalid buffer for null characters with null data)

> [R] Invalid buffer for empty characters with null data
> ------------------------------------------------------
>
>                 Key: ARROW-3693
>                 URL: https://issues.apache.org/jira/browse/ARROW-3693
>             Project: Apache Arrow
>          Issue Type: Improvement
>          Components: R
>            Reporter: Javier Luraschi
>            Priority: Major
>         Attachments: Screen Shot 2018-11-02 at 10.27.11 PM.png
>
>
> I'm hitting this from data coming from Spark while retrieving this data frame:
>  
>  
> {code:java}
> <database>   <name>    <temp>
> default      a         TRUE
>              b         TRUE
> {code}
>  
> Error:
> {code:java}
> error: Failed to fetch data: invalid data in buffer 2
> {code}
> The problem is that is possible to have a NULL character array with offsets set to 0, notice that in the example above Spark returns two batches, so effectively, we are trying to parse:
>  
> {code:java}
> <database>   <name>    <temp>
>              b         TRUE
> {code}
>  
> Where the data array is NULL and the offsets 0s for the <database> columns.
> Here is a snapshot while debugging StringArray_to_Vector:
> !Screen Shot 2018-11-02 at 10.27.11 PM.png!



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