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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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