[jira] [Commented] (ARROW-1865) [C++] Adding a column to an empty Table fails

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

    [ https://issues.apache.org/jira/browse/ARROW-1865?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16271072#comment-16271072 ] 

ASF GitHub Bot commented on ARROW-1865:
---------------------------------------

wesm opened a new pull request #1373: ARROW-1865: [C++] Do not alter number of rows attribute when removing last column from Table
URL: https://github.com/apache/arrow/pull/1373
 
 
   

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> [C++] Adding a column to an empty Table fails
> ---------------------------------------------
>
>                 Key: ARROW-1865
>                 URL: https://issues.apache.org/jira/browse/ARROW-1865
>             Project: Apache Arrow
>          Issue Type: Bug
>          Components: C++
>            Reporter: Uwe L. Korn
>            Assignee: Wes McKinney
>              Labels: pull-request-available
>             Fix For: 0.8.0
>
>
> If we remove a column from a table and add new column (probably a casted version of it), it is rejected as the Table {{num_rows}} was reset to 0:
> {code}
> Invalid: Added column's length must match table's length. Expected length 0 but got length 1
> {code}



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