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https://issues.apache.org/jira/browse/HIVE-14170?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15447093#comment-15447093
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Sahil Takiar commented on HIVE-14170:
-------------------------------------

You can test this locally by:

* Applying the patch locally
* Building the code, un-tarring the distribution, etc.
* Run Beeline with the {{--incremental}} and {{--incrementalBufferRows=5}} 
options
* Load some dummy data into a table (15 rows should be sufficient, you can just 
have a single column that is a string; ideally each row is of varying length)
* Run a {{select *}} from the table

The output that is printed should show that the width of the output table is 
re-calculated every 5 rows. Note you can really only see this if the rows are 
of varying length. You can also run this without the {{--incremental}} to see 
what the output looks if a global width calculation is done.

> Beeline IncrementalRows should buffer rows and incrementally re-calculate 
> width if TableOutputFormat is used
> ------------------------------------------------------------------------------------------------------------
>
>                 Key: HIVE-14170
>                 URL: https://issues.apache.org/jira/browse/HIVE-14170
>             Project: Hive
>          Issue Type: Sub-task
>          Components: Beeline
>            Reporter: Sahil Takiar
>            Assignee: Sahil Takiar
>         Attachments: HIVE-14170.1.patch, HIVE-14170.2.patch, 
> HIVE-14170.3.patch, HIVE-14170.4.patch
>
>
> If {{--incremental}} is specified in Beeline, rows are meant to be printed 
> out immediately. However, if {{TableOutputFormat}} is used with this option 
> the formatting can look really off.
> The reason is that {{IncrementalRows}} does not do a global calculation of 
> the optimal width size for {{TableOutputFormat}} (it can't because it only 
> sees one row at a time). The output of {{BufferedRows}} looks much better 
> because it can do this global calculation.
> If {{--incremental}} is used, and {{TableOutputFormat}} is used, the width 
> should be re-calculated every "x" rows ("x" can be configurable and by 
> default it can be 1000).



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