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https://issues.apache.org/jira/browse/HIVE-1752?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12924847#action_12924847
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Namit Jain commented on HIVE-1752:
----------------------------------

Copying from HIVE-1750,

For eg, if T is partitioned on ds,
and the query is:

select c1 from T where ds = '1' and c2 > 10;

there is no reason to add 'ds' to each row 


> Avoid UnionStructObjectInspector for partition columns when necessary
> ---------------------------------------------------------------------
>
>                 Key: HIVE-1752
>                 URL: https://issues.apache.org/jira/browse/HIVE-1752
>             Project: Hive
>          Issue Type: Improvement
>            Reporter: Siying Dong
>            Assignee: Siying Dong
>
> Once HIVE-1750 is finished,  union struct for partition columns and normal 
> columns is not needed anymore. We can save some costs by not having the 
> struct.

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